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Comment by kelnos | Hacker News Reader

That forks twice for every iteration of the loop, though: once for the subshell, and again to run `tr`.

Fix:

  ps() { for i in /proc/[0-9]*; do readarray -d '' -t cmdline < "$i/cmdline"; printf "%s: %s\n" "${i#/proc/}" "${cmdline[*]}"; done; }