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I have successfully installed some packages using the command line 'sudo apt-get install ...' when I have known in advance that those packages are available. But how can I search for or get a list of what is available in the repositories?

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To search for a particular package by name or description:

From the command-line, use:

apt-cache search keyword

where the search keyword can be all or part of a package name or any words used in its description.

For example, apt-cache search proxy includes both these packages:

tinyproxy - A lightweight, non-caching, optionally anonymizing HTTP proxy
tircd - ircd proxy to the twitter API

Note: the list may be long, so you can pipe the output to less to make it scrollable one line or one screen at a time, i.e. apt-cache search something | less.

To get a list of ALL packages

apt-cache search .

Use Synaptic if you have X-forwarding enabled or are on a desktop

Synaptic is often a more convenient way to do this, but requires at least an X server on your end (unless you're running a desktop environment). Install with sudo apt-get install synaptic if necessary.

  • Synaptic on ssh'd server via X forwarding:

    enter image description here

  • Synaptic running locally on Ubuntu Desktop:

    enter image description here

  • @MarkThomas Try apt-cache policy too, it gives you more information about the sources. – yclian Mar 21 '15 at 2:44
  • like apt-get, you can just run apt-cache without any arguments and get the short help/cheatsheet info. You can always read the manpages on it for longer help. (i.e. man apt-cache ) – pd12 Oct 28 '15 at 1:08
  • Supposing that I'm foolish enough to want to live the results into apt install, is there a smart way to do that? The output from this function is messy. One could use the first word from each line, but there should be an easier way. – Deleet Nov 4 '16 at 7:41
  • you can also search online. packages.ubuntu.com – activedecay Sep 8 '17 at 5:18
  • If you only need the names of all the packages available just do apt-cache pkgnames – flaz14 Feb 15 '18 at 11:15
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Using aptitude, apt-cache, and apt all format the output differently. (None of these require the use of sudo when searching for a package.) I prefer using apt for its readability. It highlights the package name and puts a space between the different packages. It also has [installed] listed next to each package that is already installed. Usage:

apt search package-name
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    if i run say '$ apt search firefox' it produces tons of output results :( – user3804598 Jan 2 '18 at 17:45
  • You could narrow your search with something like: apt search firefox | grep -A 3 firefox – jbrock Apr 16 '18 at 16:01
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    Another option to narrow the search: apt search ^firefox or apt search ^firefox$ – jbrock Jul 26 at 8:24
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You can also use aptitude from the command line:

aptitude search xxxxxx
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    The annoying thing about this one is that Ubuntu doesn't seem to give it to you by default. Up until I learnt about apt-cache, I was always having do so apt-get install aptitude on each new box I installed. However, since I can't find a way to get apt-cache to show me whether it's installed, I guess I'll have to keep doing that for a bit :-) – user9184 May 5 '16 at 6:39
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    @paxdiablo Just create two line shell script (second line someting like dpkg --list | grep "$1") or add shell function to this effect into your .bash_login... :-) – FooF Aug 12 '16 at 3:43
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The apt-cache command line tool is used for searching apt software package cache. In simple words, this tool is used to search software packages, collects information of packages and also used to search for what available packages are ready for installation on Debian or Ubuntu based systems.

To find out the package name and with it description before installing, use the ‘search‘ flag. Using “search” with apt-cache will display a list of matched packages with short description. Let’s say you would like to find out description of package ‘vsftpd‘, then command would be.

Syntax:

apt-cache search SearchTerm
$ apt-cache search vsftpd

The possible output would be:

vsftpd - lightweight, efficient FTP server written for security
ccze - A robust, modular log coloriser
ftpd - File Transfer Protocol (FTP) server
yasat - simple stupid audit tool

To find and list down all the packages starting with ‘vsftpd‘, you could use the following command.

$ apt-cache pkgnames vsftpd

You may also want to run the results through a more, or even a grep. For instance:

apt-cache search firefox | grep plugin
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Assuming you want to do all of this from the terminal use the following:

first I recommend you update the package index files so the list of all files in the repository you are about to create is up to date

sudo apt-get update

then use "search regex" function in apt-cache where "regex" stands for Regular Expression and is the pattern given to search. For more info about search patterns you can look up manual regex(7) by command man 7 regex or in English. A regex variable equal to . will suffice.

apt-cache search .

The above will give you ALL the results but it is not in any order that is particularly helpful for browsing.

So finally we can sort by dictionary order usingsort -d and show only a page at a time usingless.

apt-cache search . |sort -d |less

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