How to Use which Command in Linux: Syntax and Examples

The which command in Linux shows the full path of executables that would run when you type a command. Use which command_name to find where that command is located in your system's PATH.

Syntax

The basic syntax of the which command is:

• which [options] command_name

Here, command_name is the name of the program or command you want to locate. Options can modify the behavior but are optional.

bash

which command_name

Example

This example shows how to find the location of the python3 executable on your system. It helps you know which version or path will run when you type python3.

bash

which python3

Output

/usr/bin/python3

Common Pitfalls

Sometimes which returns no output if the command is not in your PATH or is a shell builtin. Also, which only shows the first match in PATH, so if you have multiple versions, it won't show all.

Wrong usage example:

which

This gives an error because you must specify a command name.

Right usage example:

which ls

bash

which
which ls

Output

which: no command specified
/bin/ls

Quick Reference

Option	Description
-a	Show all matching executables in PATH, not just the first
-s	Silent mode, no output, only return status
-h	Show help information

Key Takeaways

Use which command_name to find the full path of a command executable.

which only shows the first match in your PATH by default.

If which returns nothing, the command may not be installed or is a shell builtin.

Use which -a to see all locations of a command in your PATH.

Always specify a command name; running which alone causes an error.