$ ps -f $(pgrep VBoxHeadless) UID PID PPID C STIME TTY STAT TIME CMD tester 3514 3378 18 10:06 ? Sl 3:09 /usr/lib/virtualbox/VBoxHeadless --comment 26bc5afa-06f3-453f-9d8d-3d7d6d4e5850 --startvm 26bc5afa-06f3-453f- tester 7231 6994 17 10:01 ? Sl 3:47 /usr/lib/virtualbox/VBoxHeadless --comment 5f58b37a-a4d6-4c4e-a3fa-0c8b3c847c1f --startvm 5f58b37a-a4d6-4c4e- tester 25356 25194 16 10:00 ? Sl 3:51 /usr/lib/virtualbox/VBoxHeadless --comment c8985837-3be5-401c-bcc9-3eca07ccaa83 --startvm c8985837-3be5-401c-