Commands tagged Ubuntu

The title is optional.

Options:

-t: expire time in milliseconds.

-u: urgency (low, normal, critical).

-i: icon path.

On Debian-based systems you may need to install the 'libnotify-bin' package.

Useful to advise when a wget download or a simulation ends. Example:

Displays only the VGA adapter/chipset being used for the graphics. In this case, it gave me the "M22" and "Mobility Radeon x300" that I needed to research a graphics issue I was having.

Reconfigures time zone in Ubuntu, which I cannot figure out how to do through the GUI. Worked like a charm to set my time zone to CEST from EDT.

'dpkg -S' just matches the string you supply it, so just using 'ls' as an argument matches any file from any package that has 'ls' anywhere in the filename. So usually it's a good idea to use an absolute path. You can see in the second example that 12 thousand files that are known to dpkg match the bare string 'ls'.

Ever since the switch to pulseaudio, Ubuntu users including myself have found themselves with no sound intermittently. To fix this, just use this command and restarts firefox or mplayer or whatever.

This command is useful when you want to install the same packages on another fresh OS install for example. To do that, use:

release upgrades are major upgrades as from 8.04 to 8.10 or from 8.10 to 9.04

update-manager-core must be installed:

in some cases you must edit '/etc/update-manager/release-upgrades' and set 'Prompt=normal'

cd into the directory that contains the file.

this is just the usual move command but shortcut'd.

say you wanted to move a photo img1.png from ~/photos/holidayphotos into the parent directory which is ~/photos

command would be:

~/photos/holidayphotos$ mv img1.png ..

I use Ubuntu so this'll work in debian but not sure what else.

Useful to e.g. keep an eye on several logfiles.

Compares two versions with dpkg. It is not always obvious what version dpkg/apt will consider to be more recent. Operators include the following :

* These treat an empty version as earlier than any version: lt le eq ne ge gt.

* These treat an empty version as later than any version: lt-nl le-nl ge-nl gt-nl.

* These are provided only for compatibility with control file syntax: < > >.

This command doesn't output anything. It only returns with status 0 or 1, hence the echo "y" || echo "n" to get an output.

Requires: imagemagick and graphviz

On Debian systems, displays a graph of package dependencies. Works also with other image formats, like svg :

On Debian systems, choose which command provides java. Works for all alternatives listed in /etc/alternatives.