Linux command Search the difference between whereis and which

Linux command Search the difference between whereis and which

1 whereis

1, grammar,

whereis command name

Search the path of the command and the location of the help document

Options:

-ES23en: Find only executable files
-ES25en: Find the help file only

2, in actual combat

[root@localhost ~]# whereis ls
ls:/usr/bin/ls /usr/share/man/man1/ls.1.gz/usr/share/man/man1p/ls.1p.gz
[root@localhost ~]# whoami
root
[root@localhost ~]# whatis
whatis what?
[root@localhost ~]# whatis ls
ls (1)- list directory contents
ls (1p)- list directory contents
[root@localhost ~]# whereis -b ls
ls:/usr/bin/ls
[root@localhost ~]# whereis -m ls
ls:/usr/share/man/man1/ls.1.gz/usr/share/man/man1p/ls.1p.gz

2 which

1, grammar,

which command name

Search the path and alias of the command

2, in actual combat

[root@localhost ~]# which ls
alias ls='ls --color=auto'
/usr/bin/ls
[root@localhost ~]# which pwd
/usr/bin/pwd
[root@localhost ~]# whereis cd
cd:/usr/bin/cd /usr/share/man/man1/cd.1.gz/usr/share/man/man1p/cd.1p.gz
[root@localhost ~]# which cd
/usr/bin/cd

3 PATH environment variable

Defines the path to the system search command

[root@localhost ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin

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