Laut ps
Handbuch:
t ttylist Select by tty. Nearly identical to -t and --tty, but can also be used with an empty ttylist to indicate the terminal associated with ps. Using the T option is considered cleaner than using t with an empty ttylist.
" Select by tty " bedeutet hier " select by tty steuern ". Und ssh -f
würde im Hintergrund als Daemon laufen, der kein kontrollierendes tty hat . Siehe Ausgabe von Schritt 111 in folgendem Beispiel:
[STEP 107] # tty /dev/pts/28 [STEP 108] # ssh -D :7070 -f -n -N 127.0.0.1 [STEP 109] # pgrep -lf 7070 72531 ssh [STEP 110] # ls -l /proc/72531/fd total 0 lrwx------ 1 root root 64 2016-11-16 17:47 0 -> /dev/pts/28 lrwx------ 1 root root 64 2016-11-16 17:47 1 -> /dev/pts/28 lrwx------ 1 root root 64 2016-11-16 17:47 2 -> /dev/pts/28 lrwx------ 1 root root 64 2016-11-16 17:47 3 -> socket:[3572721] lrwx------ 1 root root 64 2016-11-16 17:47 4 -> socket:[3572770] [STEP 111] # ps p 72531 j PPID PID PGID SID TTY TPGID STAT UID TIME COMMAND 1 72531 72531 72531 ? -1 Ss 0 0:00 ssh -D :7070 -f -n -N 127.0.0.1 [STEP 112] #