Thinking little more about it - you might be able to get around the access
permissions - to display stuff on other user's screens by using xhost
command as part of user's default environment setup at login.
That however is breaking the security - you can imagine how the desktop
would look if random users can display stuff on your desktop. Beside
annoyances, I can imagine fake terminals, browsers, etc. and windows
covering whole screen without the closing button. ....
Tomas
On Feb 6, 2018 1:57 PM, "Tomas Kuchta" <tomas.kuchta.li...@gmail.com> wrote:
> I do not believe that you will be able to open graphical window using
> cron. The best you can hope for is sending notifications or emails.
>
> If you have the strength to continue with random experiments. Try: export
> DISPLAY :1
> In your script before launching the window. Although that will likely be
> blocked because the executing user is different than the user owning the
> graphical environment.
>
> The only sure way, I can think of, would be to use existing or write own
> notification system. This would run after login, by the user and accept
> your notification messages for displaying.
>
> Hope it helps, Tomas
>
> On Feb 6, 2018 1:45 PM, "Ali Corbin" <ali.cor...@gmail.com> wrote:
>
>> Another thing to try is to use the full path, in case the cron environment
>> doesn't include $PATH
>>
>> On Tue, Feb 6, 2018 at 1:39 PM, wes <p...@the-wes.com> wrote:
>>
>> > try sudo wmctrl, the same way you're doing sudo zenity.
>> >
>> > -wes
>> >
>> > On Tue, Feb 6, 2018 at 1:27 PM, Denis Heidtmann <
>> denis.heidtm...@gmail.com
>> > >
>> > wrote:
>> >
>> > > I have a script which runs daily via anacron. I want the script to
>> > launch
>> > > a zenity window to notify the user, so I issue the command wmctrl -k
>> on
>> > > before zenity and wmctrl - off after. This is supposed to minimize
>> all
>> > > open windows to ensure that the zenity window will be visible. I
>> have a
>> > > test script to show that it works. Both scripts are owned by root,
>> but
>> > > editable by me. I have run the test script from a command line
>> login
>> > > using sudo, as well as from a Gnome terminal. The test script
>> behaves as
>> > > intended--the desktop is cleared of all open windows. I inserted a
>> test
>> > > zenity window at the beginning of the real script to verity that when
>> > > launched by anacron it would behave the same way. It does not! It
>> does
>> > > not minimize open windows, but the zenity window does appear on top of
>> > the
>> > > open windows.
>> > >
>> > > What is different about the anacron launch? I have been monkeying
>> with
>> > > this thing for quite a while. I tried wmctrl -R but that did not
>> behave
>> > as
>> > > I had hoped. wmctrl -k does what I want except when anacron is doing
>> the
>> > > launching.
>> > >
>> > > Ideas?
>> > >
>> > > -Denis
>> > >
>> > > Test script:
>> > >
>> > > #!/bin/bash
>> > > # test to get zenity to work when script is not called from an X
>> window
>> > > # change to a non-X login (^ alt F2), call this w/sudo, then go back
>> to X
>> > > (^ alt F7)
>> > > # to see if a zenity window shows up.
>> > > # feb 5 2018 the above worked--all open windows minimized.
>> > >
>> > >
>> > > Notification () {
>> > > # pass title, text of notice, and timeout as 3 parameters
>> > > TITLE=$1; MSG=$2; TIMOUT=$3
>> > > wmctrl -k on
>> > > sudo -u household zenity --question --title="$TITLE" --text="$MSG"
>> > > --timeout="$TIMOUT"
>> > > RETRNCODE=$?
>> > > wmctrl -k off
>> > > return $RETRNCODE # return codes: 0 = YES, 1 = cancel, 5 = timeout
>> > > }
>> > >
>> > > sleep 30
>> > >
>> > > export DISPLAY=:0
>> > > # test of launch of zenity
>> > > Notification "Test of zenity (backup_checksh)" "This should minimize
>> all
>> > > open windows." 20
>> > > # remove when satisfied that launch works.
>> > >
>> > > Top of real script:
>> > >
>> > > #!/bin/bash
>> > >
>> > > Notification () {
>> > > # pass title, text of notice, and timeout as 3 parameters
>> > > TITLE=$1; MSG=$2; TIMOUT=$3
>> > > wmctrl -k on
>> > > sudo -u household zenity --question --title="$TITLE" --text="$MSG"
>> > > --timeout="$TIMOUT"
>> > > RETRNCODE=$?
>> > > wmctrl -k off
>> > > return $RETRNCODE # return codes: 0 = YES, 1 = cancel, 5 = timeout
>> > > }
>> > > export DISPLAY=:0
>> > > # test of launch of zenity
>> > > Notification "Test of zenity (backup_checksh)" "This should minimize
>> all
>> > > open windows." 5
>> > > # remove when satisfied that launch works.
>> > > MAX_TIME=$((7 * 24 * 3600))
>> > > _______________________________________________
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