Is there a way to check if a program is available in the repository by commandline?

When i find a interesting program i want to test and install in ubuntu i first check if it's available in the repository. For that i use the software center.

But does a possibility exist to check it via commandline i.e. apt or aptitude? Similar apt get install command?


You can use any one of these commands,

apt-cache search <package_name>

aptitude search <package_name>

apt-cache policy <package_name>

sudo apt-get install <package_name> -s

Output:

karthick@Ubuntu-desktop:~$ sudo apt-get install sun-java6-jdk -s
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package sun-java6-jdk is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package sun-java6-jdk has no installation candidate

You can install apt-file which allows you to search for file names in APT. For instances to find a binary nagios

marco@marco-desktop:~$ sudo apt-file search nagios3
aide-common: /usr/share/aide/config/aide/aide.conf.d/31_aide_nagios3
cherokee-doc: /usr/share/doc/cherokee-doc/media/images/cookbook_nagios3.png
nagios-images: /usr/share/nagios3/htdocs/images/logos/andrade
nagios-images: /usr/share/nagios3/htdocs/images/logos/base
nagios-images: /usr/share/nagios3/htdocs/images/logos/bernhard
nagios-images: /usr/share/nagios3/htdocs/images/logos/cook
nagios-images: /usr/share/nagios3/htdocs/images/logos/didier
nagios-images: /usr/share/nagios3/htdocs/images/logos/remus
nagios-images: /usr/share/nagios3/htdocs/images/logos/satrapa
nagios-images: /usr/share/nagios3/htdocs/images/logos/werschler
nagios3: /usr/share/doc/nagios3
nagios3: /usr/share/lintian/overrides/nagios3
nagios3-cgi: /etc/nagios3/cgi.cfg
nagios3-cgi: /etc/nagios3/stylesheets/avail.css
nagios3-cgi: /etc/nagios3/stylesheets/checksanity.css
nagios3-cgi: /etc/nagios3/stylesheets/cmd.css
nagios3-cgi: /etc/nagios3/stylesheets/common.css
nagios3-cgi: /etc/nagios3/stylesheets/config.css

It breaks down by package: file match