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## 18. Login/logout watching

You can specify login or logout events to monitor by setting the watch variable. Normally, this is done by specifying a list of usernames.

    % watch=( pfalstad subbarao sukthnkr egsirer )

The `log` command reports all people logged in that you are watching for.

    % log
    pfalstad has logged on p0 from mickey.
    pfalstad has logged on p5 from mickey.
    % ...
    subbarao has logged on p8 from phoenix.
    % ...
    subbarao has logged off p8 from phoenix.
    % ...
    sukthnkr has logged on p8 from dew.
    % ...
    sukthnkr has logged off p8 from dew.

If you specify hostnames with an `@` prepended, the shell will watch for all users logging in from the specified host.

    % watch=( @mickey @phoenix )
    % log
    djthongs has logged on q2 from phoenix.
    pfalstad has logged on p0 from mickey.
    pfalstad has logged on p5 from mickey.

If you give a tty name with a `%` prepended, the shell will watch for all users logging in on that tty.

    % watch=( %ttyp0 %console )
    % log
    root has logged on console from .
    pfalstad has logged on p0 from mickey.

The format of the reports may also be changed.

    % watch=( pfalstad gettes eps djthongs jcorr bdavis )
    % log
    jcorr has logged on tf from 128.112.176.3:0.
    jcorr has logged on r0 from 128.112.176.3:0.
    gettes has logged on p4 from yo:0.0.
    djthongs has logged on pe from grumpy:0.0.
    djthongs has logged on q2 from phoenix.
    bdavis has logged on qd from BRUNO.
    eps has logged on p3 from csx30:0.0.
    pfalstad has logged on p0 from mickey.
    pfalstad has logged on p5 from mickey.
    % WATCHFMT=’%n on tty%l from %M’
    % log
    jcorr on ttytf from 128.112.176.3:0.
    jcorr on ttyr0 from 128.112.176.3:0.
    gettes on ttyp4 from yo:0.0
    djthongs on ttype from grumpy:0.0
    djthongs on ttyq2 from phoenix.Princeto
    bdavis on ttyqd from BRUNO.pppl.gov
    eps on ttyp3 from csx30:0.0
    pfalstad on ttyp0 from mickey.Princeton
    pfalstad on ttyp5 from mickey.Princeton
    % WATCHFMT=’%n fm %m’
    % log
    jcorr fm 128.112.176.3:0
    jcorr fm 128.112.176.3:0
    gettes fm yo:0.0
    djthongs fm grumpy:0.0
    djthongs fm phoenix
    bdavis fm BRUNO
    eps fm csx30:0.0
    pfalstad fm mickey
    pfalstad fm mickey
    % WATCHFMT=’%n %a at %t %w.’
    % log
    jcorr logged on at 3:15pm Mon 20.
    jcorr logged on at 3:16pm Wed 22.
    gettes logged on at 6:54pm Wed 22.
    djthongs logged on at 7:19am Thu 23.
    djthongs logged on at 7:20am Thu 23.
    bdavis logged on at 12:40pm Thu 23.
    eps logged on at 4:19pm Thu 23.
    pfalstad logged on at 3:39am Fri 24.
    pfalstad logged on at 3:42am Fri 24.

If you have a `.friends` file in your home directory, a convenient way to make zsh watch for all your friends is to do this:

    % watch=( $(< ˜/.friends) )
    % echo $watch
    subbarao maruchck root sukthnkr ...

If watch is set to `all`, then all users logging in or out will be reported.

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