osx - How do I pipe only certain results from a command to another or an If statement? -

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i trying find way build cron job log out idle users in osx based on last time actively moved mouse. osx's built in functionality logs out , if entire machine idle. way have been able find out idle using 'w' gives me few columns , 1 has idle time in it. how can pipe numbers field , ignore rest? there easier way it?

how write this:

1.issue command w

2.check username see if time idle greater 30 mins , if issue command ps -ajc | grep loginwindow , find username , pid loginwindow user exceeded idle time , issue sudo kill -9 "whatever pid user's login window"

and exclude "whateverusernamehere" script (so way stay logged in).

i know asked pipes. standard way is: consider using tmout variable.

add login profile:

declare -r tmout=14400

this logs out inactive interactive users after 14400 seconds, 4 hours of inactivity.

you solution, kill -9, kind of harsh , can cause problems. user can have file open, method not detect that, , kill user off, can corrupt file.


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