Linux commands (9)---whereis, whatis, which commands

whereis Command: Locate the binary, source, and manual page files for a command

"Features" Find relevant locations for files, manual pages, commands, etc.,

Syntax

Whereis Options argument

"Common Options"

-B: Find only the binary file location-m: Find only the man pages section

"Instance 1" finds the location of the binary file

[Email protected] tmp]# whereis-b passwdpasswd:/usr/bin/passwd/etc/passwd[[email protected] tmp]# whereis-b Shadowsha Dow:/etc/shadow/usr/include/shadow.h

"Instance 2" Find manual manual page

[Email protected] tmp]# whereis-m passwdpasswd:/usr/share/man/man1/passwd.1.gz/usr/share/man/man5/passwd.5.gz[[ Email protected] tmp]# whereis-m CDCD:/usr/share/man/man1/cd.1.gz/usr/share/man/man1p/cd.1p.gz[[email protected] tmp ]# whereis-m Sortsort:/usr/share/man/man1/sort.1.gz/usr/share/man/man3/sort.3pm.gz/usr/share/man/man1p/ Sort.1p.gz

whatis Command: Search the Whatis database for complete words

"Features" search for specific commands in the Whatis library

Syntax

Whatis COMMAND

Instance

[[email protected] tmp]# whatis passwdpasswd                 (1)   - update user ' s authentication  tokenspasswd                (5 )   - password filepasswd [sslpasswd]    (1SSL)   -  compute password hashes[[email protected] tmp]# whatis sortsort                   (1p)   -  sort, merge, or sequence check text filessort                   (1)   - sort  lines of text filessort                   (3pm)  - perl pragma to control sort ()  behaviour 

which command: shows the full path of (shell) commands

Features view the path of the executable command

Syntax

Which COMMAND

Instance

[email protected] tmp]# which lsalias ls= ' ls--color=auto '/bin/ls[[email protected] tmp]# which PASSWD/USR/BIN/PA Sswd[[email protected] tmp]# which Cd/usr/bin/which:no CD in (/usr/lib64/qt-3.3/bin:/usr/local/sbin:/usr/local/bin:/ Sbin:/bin:/usr/sbin:/usr/bin:/root/bin) [[email protected] tmp]# which sort/bin/sort[[email protected] tmp]# which Shutdown/sbin/shutdown

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Linux commands (9)---whereis, whatis, which commands