The command who is to show who is logged on in the UNIX/Linux operating system.
1. Show logged user.
# who root pts/0 May 17 09:26 root pts/2 May 17 09:27 root pts/3 May 17 09:27 root pts/1 May 24 18:05 (10.3.100.100) itsiti pts/8 May 19 15:12 root pts/10 May 19 15:25 orauser pts/12 May 19 15:26
2. Show logged user with print line of column headings.
# who -H NAME LINE TIME COMMENT root pts/0 May 17 09:26 root pts/2 May 17 09:27 root pts/3 May 17 09:27 root pts/1 May 24 18:05 (10.3.100.100) itsiti pts/8 May 19 15:12 root pts/10 May 19 15:25 orauser pts/12 May 19 15:26
3. Show logged user with idle status.
# who -u root pts/0 May 17 09:26 old 7439 root pts/2 May 17 09:27 old 7550 root pts/3 May 17 09:27 old 7675 root pts/1 May 24 18:05 . 9068 (10.3.100.100) itsiti pts/8 May 19 15:12 old 21441 root pts/10 May 19 15:25 old 27444 orauser pts/12 May 19 15:26 old 27898
4. Show logged user with print only name, line, and time (default).
# who -s root pts/0 May 17 09:26 root pts/2 May 17 09:27 root pts/3 May 17 09:27 root pts/1 May 24 18:05 (10.3.100.100) itsiti pts/8 May 19 15:12 root pts/10 May 19 15:25 orauser pts/12 May 19 15:26
5. Show logged user with print system login processes.
# who -l LOGIN tty1 May 17 09:27 12255 id=1 LOGIN tty2 May 17 09:27 12256 id=2 LOGIN tty3 May 17 09:27 12257 id=3 LOGIN tty4 May 17 09:27 12258 id=4 LOGIN tty5 May 17 09:27 12259 id=5 LOGIN tty6 May 17 09:27 12260 id=6
6. Show logged user with print dead processes.
# who -d pts/5 May 16 10:33 24003 id=ts/5 term=0 exit=0 pts/8 May 17 12:03 15266 id=ts/8 term=0 exit=0 pts/5 Feb 25 07:13 8139 id=/5 term=0 exit=0 pts/9 Mar 23 04:27 20043 id=ts/9 term=0 exit=0 pts/13 May 19 16:38 30107 id=/13 term=0 exit=0 pts/9 Dec 31 22:45 15484 id=/9 term=0 exit=0 pts/13 Dec 31 21:49 7386 id=s/13 term=0 exit=0 pts/14 Dec 31 21:49 12631 id=s/14 term=0 exit=0 pts/15 May 20 14:26 24662 id=s/15 term=0 exit=0 pts/1 Apr 25 11:49 21311 id=/1 term=0 exit=0 :0 May 3 13:43 0 id=:0 term=0 exit=0
