Master Linux’s type Command: Find Command Types, Paths, and Aliases

Overview

The type builtin reports how the shell would interpret a given name. It distinguishes between shell built‑ins, functions, aliases, and external executables, and can reveal the absolute pathname of the executable.

Syntax

type [options] name

Common options

-a

: display every location that matches name in

$PATH

-t

: output only the type (e.g., alias, builtin, file, function) -P: print the absolute pathname of the command that would be executed, ignoring functions and built‑ins

Inspecting different kinds of commands

Shell built‑in

type cd

Typical output:

cd is a shell builtin

External executable

type ls

Typical output:

ls is /bin/ls

Alias

type ll

Typical output (when ll is defined as an alias):

ll is aliased to 'ls -alF'

Retrieving the full pathname

Use -P to obtain the resolved absolute path, even for aliases.

type -P ls

/bin/ls

type -P ll

/bin/ls

Listing all occurrences in $PATH

The -a flag shows every matching file found in the search path.

type -a python

python is /usr/bin/python

python is /usr/local/bin/python

Practical notes

When a name is both an alias and an external command, type reports the alias first; use -P to bypass the alias.

The -t option is useful in scripts to branch logic based on the command type.

All output is designed for human reading; for machine parsing, combine -t with other options.