who

Linux Command – who ใช้ในการแสดงข้อมูล user ที่ login ขณะนั้น

คำสั่ง

who

$ who
msc pts/0 2017-05-09 16:32 (172.20.91.138)
msc pts/2 2017-05-08 22:18 (172.20.91.79)
msc pts/3 2017-05-08 13:36 (172.20.91.138)
spo pts/5 2017-05-10 13:16 (10.95.120.57)
mst pts/6 2017-05-10 11:54 (172.20.91.44)
mst pts/7 2017-05-08 09:20 (172.20.91.177)
msc pts/8 2017-05-08 23:00 (172.20.91.138)
mst pts/9 2017-05-10 13:39 (10.95.120.34)
vas pts/10 2017-04-04 14:11 (172.20.91.151)
spo pts/11 2017-05-03 23:44 (172.16.69.156)

โครงสร้างคำสั่ง

 who [OPTION]... [ FILE | ARG1 ARG2 ]

รายละเอียด

เป็นคำสั่งที่ใช้ในการแสดงข้อมูล user ที่ login ขณะนั้นทั้งหมด

Option

 -a, --all
 same as -b -d --login -p -r -t -T -u

 -b, --boot
 time of last system boot

 -d, --dead
 print dead processes

 -H, --heading
 print line of column headings

 --ips print ips instead of hostnames. with --lookup, canonicalizes based on stored IP, if available, rather than stored hostname

 -l, --login
 print system login processes

 --lookup
 attempt to canonicalize hostnames via DNS

 -m only hostname and user associated with stdin

 -p, --process
 print active processes spawned by init

 -q, --count
 all login names and number of users logged on

 -r, --runlevel
 print current runlevel

 -s, --short
 print only name, line, and time (default)

 -t, --time
 print last system clock change

 -T, -w, --mesg
 add user's message status as +, - or ?

 -u, --users
 list users logged in

 --message
 same as -T

 --writable
 same as -T

 --help display this help and exit

 --version
 output version information and exit

กลุ่มคำสั่ง

su

Reference:

คำสั่ง Unix – Linux Command

Linux, Unix

Author: Suphakit Annoppornchai

Credit: https://saixiii.com