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The content of this article mainly focuses on how to use the Type command in Linux. The content of the article is clear and clear. It is very suitable for beginners to learn and is worth reading. Interested friends can follow the editor to read together. I hope you can get something through this article!

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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