Check the packages installed on Linux

A command to return the package list(yum list installed, rpm -qa)
you can obtain a list of package names you want to search by piping to grep command to search for caracter strings.

[vagrant@localhost ~]$ yum list installed | grep gcc
gcc.x86_64                         4.4.7-23.el6                      @base
gcc-c++.x86_64                     4.4.7-23.el6                      @base
libgcc.x86_64                      4.4.7-23.el6                      @base

うん、インストールされているようだね。
[vagrant@localhost ~]$ yum list installed | grep perl
perl.x86_64 4:5.10.1-144.el6 @base
perl-CPAN.x86_64 1.9402-144.el6 @base
perl-DBD-MySQL.x86_64 4.013-3.el6 @base
perl-DBI.x86_64 1.609-4.el6 @base
perl-Digest-SHA.x86_64 1:5.47-144.el6 @base
perl-Error.noarch 1:0.17015-4.el6 @base
perl-ExtUtils-MakeMaker.x86_64 6.55-144.el6 @base
perl-ExtUtils-ParseXS.x86_64 1:2.2003.0-144.el6 @base
perl-Git.noarch 1.7.1-9.el6_9 @base
perl-Module-Pluggable.x86_64 1:3.90-144.el6 @base
perl-Pod-Escapes.x86_64 1:1.04-144.el6 @base
perl-Pod-Simple.x86_64 1:3.13-144.el6 @base
perl-Test-Harness.x86_64 3.17-144.el6 @base
perl-devel.x86_64 4:5.10.1-144.el6 @base
perl-libs.x86_64 4:5.10.1-144.el6 @base
perl-version.x86_64 3:0.77-144.el6 @base
[vagrant@localhost ~]$ perl -v

This is perl, v5.10.1 (*) built for x86_64-linux-thread-multi

Copyright 1987-2009, Larry Wall

Perl may be copied only under the terms of either the Artistic License or the
GNU General Public License, which may be found in the Perl 5 source kit.

Complete documentation for Perl, including FAQ lists, should be found on
this system using “man perl” or “perldoc perl”. If you have access to the
Internet, point your browser at http://www.perl.org/, the Perl Home Page.