Bash_unit – bash unit testing framework(github.com)

    # ubuntu 20.04
    echo fooboo | grep -Eo '.+?oo'
    > fooboo

    # macos big sur
    echo fooboo | grep -Eo '.+?oo'
    > foo
    > boo

    make love

    showargs() { 
        echo "$# args"
        for i in "$@" ; do
            echo "arg[${i}]"
        done
    }
    declare -- name="filename with spaces\\!.txt"
    declare -A h='([a]="b c" [foo]="'\''bar'\'' \"baz\" qu*x" )'

    showargs $name
    # 3 args
    # arg[filename]
    # arg[with]
    # arg[spaces\!.txt]

    showargs ${h[*]}   # or ${h[@]}
    # 7 args
    # arg[b]
    # arg[c]
    # arg['bar']
    # arg["baz"]
    # arg[qu*x]

    showargs "${name}"
    # 1 args
    # arg[filename with spaces\!.txt]

    showargs "${h[@]}"
    # 2 args
    # arg[b c d e]
    # arg['bar' "baz" qu*x]

  $ echo ‘pwd’
  $ echo “pwd”