Hello llist,
I am using notify-send in my udev rules to send desktop notification. Here is the actual command which is working fine for me, even from the root shell.
````````````
/bin/su `ps aux | grep startx | grep '/bin/sh' | awk '{print $1}'` -c "DISPLAY=:0.0 notify-send "test"
`````````````
the part [ ps aux | grep startx | grep '/bin/sh' | awk '{print $1}' ] is for collecting the user-name who is running startx.
now in my udev rule if I hard-coded the user name like
```````````````
ACTION=="add", SUBSYSTEM=="input", ENV{ID_CLASS}="mouse", ENV{DISPLAY}=":0.0", ENV{XAUTHORITY}="/home/user1/.Xauthority" RUN+="/bin/su user1 -c "DISPLAY=:0.0 notify-send "test" "
``````````````````````````
it works well. But if I try to add command substitution ( with in back-qoutes ) to dynamically collect the user name , it stops working. The rule is like
```````````````
ACTION=="add", SUBSYSTEM=="input", ENV{ID_CLASS}="mouse", ENV{DISPLAY}=":0.0", ENV{XAUTHORITY}="/home/user1/.Xauthority" RUN+="/bin/su `ps aux | grep startx | grep '/bin/sh' | awk '{print $1}'` -c "DISPLAY=:0.0 notify-send "test" "
``````````````````````````
Definitely I have user1 who is using startx here. Surely the command substitution with in udev rules is not working at all. Can't understand why it fails. I would be grateful if any one point out what is missing/wrong here.
Thanks
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