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I would like to use this command. I used "sleep 5s" without success. I use KDE environment.

What do you want to use it with, or what do you think it should do or want it to do? Normally you use it together with something else, e.g. in a terminal sometimes i use

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sleep 10 && ksnapshot

What this basically does is wait ten seconds, then the first command successfully completes, and with the && it executes the second command, which is a screenshot tool.

[petrherynk@localhost ~]$ su
Heslo:
[root@localhost petrherynk]# sleep 10 && ksnapshot
ksnapshot(3082)/kdeui (kdelibs): Session bus not found
To circumvent this problem try the following command (with Linux and bash)
export $(dbus-launch)
KCrash: Application 'ksnapshot' crashing...
KCrash: Attempting to start /usr/lib/kde4/libexec/drkonqi from kdeinit
sock_file=/root/.kde4/socket-localhost/kdeinit4__0
Warning: connect() failed: : Adresář nebo soubor neexistuje
KCrash: Attempting to start /usr/lib/kde4/libexec/drkonqi directly
drkonqi(3083)/kdeui (kdelibs): Session bus not found
To circumvent this problem try the following command (with Linux and bash)
export $(dbus-launch)
[root@localhost petrherynk]# export $(dbus-launch)
[root@localhost petrherynk]# sleep 10 && ksnapshot
Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
QDBusConnection: session D-Bus connection created before QCoreApplication. Application may misbehave.
QDBusConnection: session D-Bus connection created before QCoreApplication. Application may misbehave.
kbuildsycoca4 running...

[root@localhost petrherynk]# sleep 10 && ksnapshot
ksnapshot(3082)/kdeui (kdelibs): Session bus not found

You are getting this problem because your terminal is running as root user.
To launch a graphical application as root you must use

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su -

Note the '-'

djennings wrote:You are getting this problem because your terminal is running as root user.
To launch a graphical application as root you must use

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su -

Note the '-'

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export $(dbus-launch)


does the same thing as using the dash with the added benefit that it doesn't do that annoying (cd /root) that (su -) does.

Thank you, for me this problem is solved.