Which command is a frequently used command to find the location of executable files in Linux/Unix
During application development, I can use this command to locate the tomcat location for log finding.
In this tutorial, We are going to learn about which command and syntax and usage examples.
which options [string array]
This command accepts,
-adisplays all pathnames of the given input string
- string is an input filename which compared and checked against PATH folder paths
Returns the list of the path of filenames
Before returning this command, It returns the following exit codes 0 - given filename matched with executable paths 1 - filename(s) are not executable found 2 - It returns if an option is an invalid argument,
print all matching pathnames of each argument which command search for the executable files configured to environment variable PATH
PATH is an environment variable that contains all the directories pointed to executable files
First, print the PATH environment values using the echo command
$:~$ echo $PATH /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin
For example, to check where is git command is installed on a Linux machine.
$:~$ which git /usr/bin/git
git command executable found in /usr/bin folder
which command options
Please see the below example with and without options.
-a option prints all matched pathnames for a given input string
$:~$ which git /usr/bin/git $:~$ which -a git /usr/bin/git /bin/git $:~$
print the which command documentation using
info which command
WHICH(1) General Commands Manual WHICH(1) NAME which - locate a command SYNOPSIS which [-a] filename ... DESCRIPTION which returns the pathnames of the files (or links) which would be executed in the current environment, had its arguments have been given as commands in a strictly POSIX-conformant shell. It does this by searching the PATH for executable files matching the names of the arguments. It does not canonicalize path names. OPTIONS -a print all matching pathnames of each argument EXIT STATUS 0 if all specified commands are found and executable 1 if one or more specified commands is nonexistent or not executable 2 if an invalid option is specified
Sometimes which command does not work or does not return anything on console
Then you can use whereas command same like which syntax.
This article shows how to clear the terminal commands from different Operating Systems.