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This article mainly introduces the relevant knowledge of how to check whether the software package is installed in Linux, the content is detailed and easy to understand, the operation is simple and quick, and has a certain reference value. I believe you will gain something after reading this article on how to check whether the software package is installed in Linux. Let's take a look.

If you are managing a debian or ubuntu server, you may often use the dpkg or apt-get command. These two commands are used to install, uninstall, and update packages.

To check for a specific package, such as firefox, use this command:

Dpkg-s firefox

Sample output:

Package: firefox status: install ok installed priority: optional section: web installed-size: 93339 maintainer: ubuntu mozilla team architecture: amd64 version: 35.0+build3-0ubuntu0.14.04.2 replaces: kubuntu-firefox-installer provides: gnome-www-browser, iceweasel, www-browser depends: lsb-release, libasound2 (> = 1.0.16), libatk1.0-0 (> = 1.12.4), libc6 (> = 2.17), libcairo2 (> = 1.2.4), libdbus-1-3 (> = 1.0.2) Libdbus-glib-1-2 (> = 0.78), libfontconfig1 (> = 2.9.0), libfreetype6 (> = 2.2.1), libgcc1 (> = 1.14.0), libgdk-pixbuf2.0-0 (> = 2.22.0), libglib2.0-0 (> = 2.37.3), libgtk2.0-0 (> = 2.24.0), libpango-1.0-0 (> = 1.22.0), libpangocairo-1.0-0 (> = 1.14.0), libstartup-notification0 Libstdc++6, libx11-6, libxcomposite1, libxdamage1, libxext6, libxfixes3, libxrender1, libxt6 recommends: xul-ext-ubufox, libcanberra0, libdbusmenu-glib4, libdbusmenu-gtk4 suggests: ttf-lyx conffiles: / etc/firefox/syspref.js 09e457e65435a1a043521f2bd19cd2a1 / etc/apport/blacklist.d/firefox ee63264f847e671832d42255912ce144 / etc/apport/native-origins.d/firefox 7c26b75c7c2b715c89cc6d85338252a4 / etc/apparmor.d/usr.bin.firefox f54f7a43361c7ecfa3874abca2f292cf description: safe and easy web browser from mozilla firefox delivers safe, easy web browsing. A familiar user interface, enhanced security features including protection from online identity theft, and integrated search let you get the most out of the web. Xul-appid: {ec8030f7-c20a-464f-9b0e-13a3a9e97384}

As you can see above, firefox has been installed.

Again, you can use the dpkg-query command. This command will have a better output, of course, you can use wildcards.

Dpkg-query-l firefox

Sample output:

Desired=unknown/install/remove/purge/hold | status=not/inst/conf-files/unpacked/half-conf/half-inst/trig-await/trig-pend | / err?= (none) / reinst-required (status,err: uppercase=bad) | | / name version architecture description + +-= =-= = ii firefox 35.0+build3-0ubuntu0.14 amd64 safe and easy web browser from mozilla

To list all the packages installed on your system, enter the following command:

Dpkg-get-selections

Sample output:

Abiword install abiword-common install accountsservice install acl install adduser install alsa-base install alsa-utils install anacron install app-install-data install apparmor install. . . Zeitgeist install zeitgeist-core install zeitgeist-datahub install zenity install zenity-common install zip install zlib1g:amd64 install zlib1g:i386 install

The above output can be very long, depending on the packages installed on your system.

You can also use grep to filter and cut more accurate packets. For example, I want to use the dpkg command to view the gcc packages installed on the system:

Dpkg-- get-selections | grep gcc

Sample output:

Gcc install gcc-4.8 install gcc-4.8-base:amd64 install gcc-4.8-base:i386 install gcc-4.9-base:amd64 install gcc-4.9-base:i386 install libgcc-4.8-dev:amd64 install libgcc1:amd64 install libgcc1:i386 install

In addition, you can use the "- l" parameter to find out the location of the files in the package.

Dpkg-l gcc-4.8

Sample output:

/. / usr/ usr/share/ usr/share/doc/ usr/share/doc/gcc-4.8-base/ usr/share/doc/gcc-4.8-base/readme.bugs / usr/share/doc/gcc-4.8-base/news.html / usr/share/doc/gcc-4.8-base/quadmath/ usr/share/doc/gcc-4.8-base/quadmath/changelog.gz / usr/share/doc/gcc-4.8-base/gcc. . . / usr/bin/x86_64-linux-gnu-gcc-4.8 / usr/bin/x86_64-linux-gnu-gcc-ar-4.8 / usr/bin/x86_64-linux-gnu-gcov-4.8 this is the end of the article on "how to check whether a software package is installed in Linux". Thank you for reading! I believe that everyone has a certain understanding of the knowledge of "how to check whether the software package is installed in Linux". If you want to learn more, you are welcome to follow the industry information channel.

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