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$ perl -e'print `ps -f`'
UID        PID  PPID  C STIME TTY          TIME CMD
eric     19557 19556  0 14:46 pts/4    00:00:00 /bin/bash
eric     19860 19557  0 15:05 pts/4    00:00:00 perl -eprint `ps -f`
eric     19861 19860  0 15:05 pts/4    00:00:00 ps -f