Not knowing the /proc file system(admccartney.mur.at)

  $ echo /proc/[0-9]/status | wc
        1       7     105
  $ echo /proc/[1-9]*/status | wc
        1     483    8778

  $ cat dumbps 
  #!/bin/sh
  
  case $# in
    1)
   ;;
    *)
   echo "Usage: dumbps user" >&2
   exit 2
   ;;
  esac
  
  2>&- find /proc -mindepth 2 -maxdepth 2 -type f -name status -user "$1" | awk '{
   while ((getline li < $0) > 0) {
    if (li ~ /^Name:/) {
     split($0, fn, "/")
     print fn[3], substr(li, 6)
     break
    }
   }
  
   close($0)
  }'
  $ ./dumbps "$USER" | grep -w 'bash$'
  1616678  bash
  $ ./dumbps 0 | grep -w 'systemd$'
  1  systemd
  $ 

  $ ls -ld /proc/[1-9]*/status | awk '$3 == "root"' | wc
      445    4005   29367
  $ time ./dumbps >/dev/null            
  Usage: dumdps user
  
  real 0m0.001s
  user 0m0.000s
  sys 0m0.001s
  $

    y = A * x

    output = operator * input

    output = linalg.dot(operator, input)

   LONG_SCREAMING_MACRO_NAME_(uh, oh);

    char fname[BUFSIZE];

    #!/bin/dash
    for path in /proc/*/cmdline
    do
        p=${path#*/} p=${p#*/} p=${p%/*}
        case "$p" in *[!0-9]*) continue;; esac
        c="$(tr '\0' ' ' < "$path" | sed '$s/ $//')"
        [ -n "$c" ] && printf %6d\ %s\\n "$p" "$c"
    done

  int s_isnum(const char* s) {
    int result = (*s != '\0');
    while (*s != '\0') {
        if ((*s < '0') || ('9' < *s)) {
            result = 0;
        }
        s++;
    }
    return result;
  }