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I'm searching for the possibility to execute a shell script or command based on idle time in the bash shell.

As an example, if I'm in a SSH session to a server of mine and after X minutes of inactivity in the terminal, I want a command to start a desired program like cmatrix, and when I come back and press a key I will get back where I left.

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You can check the load on cpu using top – totti May 7 '13 at 9:48
    
Why not run your cmatrix or whatever all the time, but with a nice --adjustment=17 low scheduling priority? See man nice. Then, when you do something interactive, it will have a normal (0) scheduling priority and take over. – waltinator Aug 24 '15 at 3:36

Apparently GNU screen has screensaver capabilities similar to what you're asking, if you put this in your .screenrc:

blankerprg cmatrix -ab -u2
idle 60 blanker
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Is there no way to get it to run with the -l option too? – Paranoid Panda Nov 18 '15 at 14:59
1  
This only works with a screen session, no? – Thomas W. Nov 18 '15 at 15:25

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