Tips and Tricks

Package management

To which package belongs file X

# equery belongs -f <dateiname>

Which packages has USE-Flag X

# equery hasuse <useflag>

Backup an installed package

# quickpkg net-www/apache

After this you can install the package on another machine or do a fast downgrade if something went bad after an update. You can find the file under Template:Filename and in this example a symlink to the apache file in Template:Filename. To install the now precompiled binary use:

# emerge --usepkgonly "<net-www/apache-2.2.4"

Detect and get rid of leftover packages

# emerge depclean --pretend

Change your current profile

# emerge eselect

# eselect profile list

# eselect profile set <nummer>

Useful commands

Recursively set directory permissions to 755:

# find /var/www/path -type d -print0 | xargs -0 chmod -c 755

SCP file transfer

File transfer via commandline.

Upload file:

# scp /root/htdocsbackup.tar.bz2 root@remote-host.de:/root/
Download file:

# scp root@remote-host.de:/root/htdocsbackup.tar.bz2 /root/htdocsbackup.tar.bz2

Upload directory:

# scp -p -r /root/directory root@remote-host.de:/root
Download directory:

# scp -p -r root@remote-host.de:/root/directory /root

SSH tunnel

Very useful if the server you want to connect to has only the SSH port open and/or a firewall infront and you want to access for example a tomcat server running on port 8080.

# ssh -N -i /home/<user>/.ssh/id_dsa -L 7777:remote-host.de:8080 root@remote-host.de

After establishing the tunnel you can access the tomcat server of the remote machine port 8080 at your localhost port 7777.

KDE4 problems and workarounds

~/.gtkrc-2.0 doesn't affect GTK applications anymore

KDE overrides the gtkrc with it's own, if you want that. You can disable that behaviour under System Settings -> Appearance -> Colors at the bottom. However this currently does not work, so copy over your .gtkrc-2.0 from your homedir or one from the themes that come with the gtk-engines package.

# cp ~/.gtkrc-2.0 ~/.kde/share/config/gtkrc-2.0

# cp /usr/share/themes/Clearlooks/gtk-2.0/gtkrc ~/.kde/share/config/gtkrc-2.0

For more information have a look at GTK Applications under KDE.

Reset to the default Plasma layout

Log out of KDE/X and delete from tty:

# rm ~/.kde/share/config/plasma*

Change the Dolphin standard view to detailed view for ALL folders

Open Dolphin -> Settings > Configure Dolphin -> Views -> Common Tab -> and mark -> Use the same view for all folders