Linux下查看是否安装过某个软件

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1、rpm包安装的，可以用 rpm -qa 看到，如果要查找某软件包是否安装，用 rpm -qa | grep "软件或者包的名字"

rpm -qa | grep perl
2、以deb包安装的，可以用 dpkg -l 看到。如果是查找指定软件包，用 dpkg -l | grep "软件或者包的名字"

dpkg -l | grep perl
-bash: dpkg: command not found
3、yum方法安装的，可以用 yum list installed 查找，如果是查找指定包，用 yum list installed | grep "软件名或者包名"

yum list installed | grep perl
补充：

查看是否安装Perl，一般都安装了，Linux必备。

##如果安装会打印，版本等信息
perl --version
##查找perl安装目录
whereis perl
 
This is perl 5, version 16, subversion 3 (v5.16.3) built for x86_64-linux-thread-multi
(with 33 registered patches, see perl -V for more detail)
 
Copyright 1987-2012, 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