Linux command details 8, Linux other commands

8. Other Linux commands:

This section only learns other commands under the Linux system, which have TTY, STARTX, type and so on.

8.1 TTY:

Display current terminal equipment .

In the Linux operating system, all peripheral devices have their names and codes, which are stored in the/dev directory as special file types. You can perform a TTY (teletypewriter) command to query the file name of the terminal you are currently using.

8.1.1 Command syntax:

tty[Options]

8.1.2 option Parameters:

Command entry:

• -s,--silent,--quiet: Nothing prints, just returns the exit status code.  

• --help: Printing help information.  

• --version: Print the version information and exit.  

Returned status code:

• 0 indicates that the standard input is a terminal.

• 1 indicates that the standard input is not a terminal.

• 2 indicates that the given argument is an incorrect parameter.

• 3 indicates a write error has occurred.

8.1.3 instances:

Example 1: Displaying the current terminal

[[email protected]/]# TTY
/dev/pts/0

8.2 startx: Used to start X window, the program that actually launches X window is xinit.

launch the Gnome interface

8.2.1 Command syntax:

startx[parameters]

8.2.3 option Parameters:

• Client and options: x client and options;  

• Server and options: X Server and Options.

8.2.4 instances:

Example 1: To start an X session on a workstation or x terminal

Input:

StartX

Example 2: Forcing an X session on a workstation

Input:

Startx-w

Example 3: To start an X session for an X terminal and log off the user's Telnet session

Input:

StartX Kill-9 $$

Example 4: To start an X session with a. XINITRC script

Input:

Startx-x. xinitrc

Example 5: To start an X session using the MWM window Manager

Input:

Startx-m MWM

8.3 Type: Displays the types of commands

Use the type command to determine whether a given command is an internal command or an external command, and to see the location of the executable file that corresponds to the external command.

8.3.1 Command syntax:

type[options [command]

8.3.2 parameter options:

• -A shows all possible types

• -P returns information for external commands only, equivalent to the which command

• -F returns information only for Shell functions

• -T returns only information of the specified type

8.3.3 Command type:

• alias: Alias.  

• Keyword: key word, shell reserved word.

• Function: Functions, shell functions.  

• builtin: Built-in command, Shell built-in command.  

• file: File, disk file, external command.  

• unfound: Not found.

The built-in command can be used to get help with the assist command, and the external command uses man or info to get help.

8.3.4 instances:

Example 1: Display the type of the LS command

[[email protected] /]# type-a ls

LS is aliased to ' LS--color=auto '

LS Is/bin/ls

The LS command is an alias

Example 2: Display the type of the CD command

[[email protected]/]# type-a ls

LS is aliased to ' LS--color=auto '

LS Is/bin/ls

The CD command is a shell built-in command

Example 3: Display the type of the GERP command

[[email protected]/]# type-a grep
grep is/bin/grep

The grep command is an external command

Linux command details 8, Linux other commands