w

Wat het doet

Zo schrijf je het

w [OPTIONS] [USER]

Meest gebruikt

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$ als gewone gebruiker# als root (of met sudo)

1. 1Who does what?

   $w
    09:12:01 up  1:14,  2 users,  load average: 0.08, 0.12, 0.10
   USER     TTY      FROM             LOGIN@   IDLE   JCPU   PCPU WHAT
   student  tty2     tty2             08:10    1:02m  0.05s  0.03s /usr/libexec/gnome-session-binary
   admin    pts/0    192.168.122.1    09:02    0.00s  0.04s  0.00s w

   Load average under the number of CPUs is normal.

2. 2Only one user

   $w admin

   Sessions and current commands of admin.

3. 3Without the header, for a script

   $w -h

   One line per session.

4. 4Short form

   $w -s

   Fewer columns, easier to read on a small screen.

5. 5IP addresses instead of names

   $w -i

   Useful when reverse DNS is slow or wrong.

6. 6Show the process IDs of the current commands

   $w -p

   Then you can look at a process with ps -fp PID or stop it.

7. 7Find who runs a heavy command

   $w | sort -k6 -r | head

   Sort on JCPU to see the busy sessions.

8. 8Check the load before a big job

   $w | head -1

   If the load is high, start the backup later.

9. 9Find idle sessions to clean up

   $w -h | awk '$4 ~ /days/'

   Sessions idle for days. Ask the users or end them with pkill -t pts/N.

10. 10Spot a suspicious session (security)

    $w -i | grep -v '192.168.122.'

    A login from an unknown network with a strange WHAT command needs attention.

11. 11Compare with uptime

    $uptime; w | head -1

    The first line of w is the uptime output.

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