which command in Linux with examples

which command in Linux is a command which is used to locate the executable file associated with the given command by searching it in the path environment variable. It has 3 return status as follows:

  • 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.

Syntax:

which [filename1] [filename2] ...



Options:

  • which -a : This option print all matching pathnames of each argument.

  • info which : It displays help information.



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