[CentOS] Run cornjobs only when a user is logged

[C.L. Martinez]

On 01/05/2016 12:36 PM, Richard wrote:
>
>
> ------------ Original Message ------------
>> Date: Tuesday, January 05, 2016 11:26:01 +0000
>> From: "C.L. Martinez" <carlopmart at gmail.com>
>>
>> Hi all,
>>
>>    Is it possible to run cronjobs configured by a user to run only
>> when he/she is logged (via GDM/KDM,etc.)?
>>
>
> Seems a little antithetical, so you may want to provide more details
> on what the issues are and what you are trying to accomplish.
>
> That said, the cron job being run could include a bit of code at the
> top to check the user's logged in status and run or abort
> accordingly.
>
> A different approach would be to use cron.deny to keep a user from
> setting up cron jobs, and instead have "at" jobs spawned when the
> user logs in.
>

Thanks Richard. I need to modify xrandr options for a nvidia graphics 
adapter depending which user is logged.

It could be easy using "Startup applications" under Gnome, but gamma 
settings are modified by the web browser or vlc...