| 1 | #!/bin/sh |
| 2 | set -eu |
| 3 | |
| 4 | NAME="${0##*/}" |
| 5 | INTERVAL="${INTERVAL:-0.1}" |
| 6 | PID="${1:-}" |
| 7 | |
| 8 | [ -n "$PID" ] || { |
| 9 | printf "usage: %s <PID>\n" "$NAME" |
| 10 | exit 1 |
| 11 | } >&2 |
| 12 | |
| 13 | while sleep "$INTERVAL"; do |
| 14 | out="$(pstree -g 3 "$1")" |
| 15 | clear |
| 16 | printf "%s\n" "$out" |
| 17 | done |
| 18 |