cron + notify send

[l3ecl]

I can't get cron to work out a notify send.

[jk@Ubuntu /]$ sudo crontab -l
* * * * * env DISPLAY=:0.0 /home/jk/Scripts/Alarm.sh >> /home/jk/check.log 2>&1
* * * * *  DISPLAY=:0.0 /home/jk/Scripts/Alarm.sh >> /home/jk/check.log 2>&1

Cron creates an empty 'check.log' in my home directory but still doesn't display notify-send.

I've checked the 'notify-send script' manually and it works.

[jk@Ubuntu /]$ cat /home/jk/Scripts/Alarm.sh 
#!/bin/bash
DISPLAY=:0.0 /usr/bin/notify-send Blink "Blink 5x" -t 7000

[Rushyang]

I had the same problem before.. and then I enabled X ACL for localhost to connect to GUI applications.

~$ xhost +local:
non-network local connections being added to access control list
~$ xhost
access control enabled, only authorized clients can connect
LOCAL:
...

Reference:
https://help.ubuntu.com/community/Cr...20Applications

[Rushyang]

Also, there is no need of "DISPLAY=0.0" in your Alarm.sh, as you'll be giving it from cron.

& with notify-send "expire time" doesn't work yet. No Matter what you do, that notification will stay on your screen ~10 seconds.

PS: if you're getting work expire-time somehow.. please let me know.

[DaithiF]

also, any reason why you're running this from roots crontab (sudo crontab) rather than your own user's crontab? As root you won't have the correct DBUS_SESSION_BUS_ADDRESS set that you would need to send the notification to your users gnome session, so I don't think your notify-send command will work.

[l3ecl]

also, any reason why you're running this from roots crontab (sudo crontab) rather than your own user's crontab? As root you won't have the correct DBUS_SESSION_BUS_ADDRESS set that you would need to send the notification to your users gnome session, so I don't think your notify-send command will work.

i disabled the 'sudo' command and got it working perfectly, awesome. thanks!

[l3ecl]

Also, there is no need of "DISPLAY=0.0" in your Alarm.sh, as you'll be giving it from cron.

& with notify-send "expire time" doesn't work yet. No Matter what you do, that notification will stay on your screen ~10 seconds.

PS: if you're getting work expire-time somehow.. please let me know.

no wonder it stayed a little too long

[BkkBonanza]

It is possible to enable the timeout (-t) option but it requires replacing notify-send with a ppa package that a user rebuilt with the fix. I did that and it works. The ppa is leolik

The all-knowing Ubuntu devs have decided that they don't want to support -t so other than this you'll not see it supported any time soon.

[Rushyang]

also, any reason why you're running this from roots crontab (sudo crontab) rather than your own user's crontab? As root you won't have the correct DBUS_SESSION_BUS_ADDRESS set that you would need to send the notification to your users gnome session, so I don't think your notify-send command will work.

yes, you're right DBUS_SESSION_BUS_ADDRESS variable is unavailable in root environments. But, I wonder notify-send with my root cron is working perfectly... I know this because, This is because I run some cron for regular data backup & kill processes at specific time as root & to notify that task successfully completed, I use notify-send.

[Rushyang]

I also wonder, is there any way to work with zenity via crons??

EDIT:
well, I just simply figured out if we add "DISPLAY=:0.0" line as prefix before calling any GTK+ dialogs (through zenity) even in scripts. They works just fine.

[DaithiF]

the dbus session variable problem can be gotten around ... ie. even if you are root you can figure out the right value for a logged in user and set that value in your own environment such that notify-send appears on the user's desktop.

you pgrep for the users nautilus session, or gnome-panel, etc, ie. some process that is sure to running if that user is logged in, then from the pid grab the variable from the /proc/<pid>/environ

so something like:

pid=$(pgrep -u username nautilus)
dbus=$(grep -z DBUS_SESSION_BUS_ADDRESS /proc/$pid/environ | sed 's/DBUS_SESSION_BUS_ADDRESS=//' )
DBUS_SESSION_BUS_ADDRESS=$dbus