1) How to find out if a package is installed or not in Linux There are multiple ways to check find locate package is installed in linux machine or not 1.a) Using which command The ‘which’ command returns an executable path that can be executed when the command is entered in the terminal. # which vi /usr/bin/vi 1.b) Using whereis command The ‘whereis’ command is used to search the binary, source, and man page files for a given command. # whereis vi vi: /usr/bin/vi /usr/share/man/man1/vi.1p.gz /usr/share/man/man1/vi.1.gz 1.c) Using locate command The ‘locate’ command performs faster than the find command because it uses an updatedb database, whereas the find command searches in real time. # locate --basename '\nano' /usr/bin/nano /usr/share/nano /usr/share/doc/nano 2) How to find out whether a package is installed or not in Linux, using package manager 2.a) On CentOS / Red Hat (RHEL) 6/7 Use yum command or rpm command to deter...
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