How do I search for available packages from the command-line?

  • I have successfully installed some packages using the command line 'sudo apt-get install packagename' 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?

  • ish

    ish Correct answer

    8 years ago

    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.

    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` )

    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.

    If you only need the names of all the packages available just do `apt-cache pkgnames`

  • 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
    

    if i run say '$ apt search firefox' it produces tons of output results :(

    You could narrow your search with something like: `apt search firefox | grep -A 3 firefox`

    Another option to narrow the search: `apt search ^firefox` or `apt search ^firefox$`

    @jbrock if your output is not a tty but a pipe like in `apt search firefox | grep -A 3 firefox` then you should use `apt-cache search` instead. The output of the `apt` tool is meant for human consumption and can change without notice. The `apt-get` and `apt-cache` tools have stable output that can be used in scripts and pipelines like yours.

  • You can also use aptitude from the command line:

    aptitude search xxxxxx
    

    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 :-)

    @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`... :-)

  • 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
    
  • 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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Content dated before 6/26/2020 9:53 AM