How to use the Type command in Linux

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The type tool is used to display type information for commands. It will show how entering a given command on the command line will be interpreted.

Use the type command

The type command is built into bash, and the type syntax:

Type [- afptP] [name...]

For example, look at the type of type:

[root@localhost ~] # type typetype is a shell builtin

You can also provide multiple parameters:

[root@localhost ~] # type vim sleep headvim is hashed (/ usr/bin/vim) sleep is / usr/bin/sleephead is / usr/bin/head

Type of command

The-t option tells type to print a word describing the type of command, which will be one of the following:

Alias-alias

Builtin-built-in command

File-Fil

Keyword-keyword

Here are some examples:

Alias

[root@localhost ~] # type-t lsalias# in Centos system, the command corresponding to ls alias is ls-- color=auto [root@localhost bin] # type lsls is aliased to `ls-- color=auto'

Builtin

[root@localhost] # type-t printfbuiltin

Printf is a built-in command for shell

File

[root@localhost] # type-t awkfile

Awk is an executable file

Keyword

[root@localhost] # type-t whilekeyword

While, for, if, else. Wait, it's a reserved keyword in Bash.

Displays the location and type of the command

Use the-a command to display the location and type of the command:

[root@localhost ~] # type-a lsprintf awk whilels is aliased to `ls-- color=auto'ls is / usr/bin/lsprintf is a shell builtinprintf is / usr/bin/printfawk is / usr/bin/awkwhile is a shell keyword

This example shows the type and location of the ls,printf,awk,while command after execution.

What is Linux system Linux is a free-to-use and free-spread UNIX-like operating system, is a POSIX-based multi-user, multi-task, multi-threaded and multi-CPU operating system, using Linux can run major Unix tools, applications and network protocols.

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