linux: create original Terminal command

Conclusion only

Create command.sh and describe function Open .bashrc and add source $ {path-to-command.sh} /command.sh Details below

1 Basic

`terminal`


#open terminal
#Enter below(shift +Line break with Enter)
user@pop-os:~$ function test() {
> echo $1
> }

#Call the defined function
user@pop-os:~$ test "hello bash script"
hello bash script

Easy. But once you close the terminal, you can't use it anymore

2 Save the function to a file

`terminal`


# rotate.make sh
user@pop-os:~$ mkdir commands
user@pop-os:~$ vim commands/rotate.sh

`.sh:rotate.sh`


#!/bin/bash
# rotate screen
function rotate() {
  case $1 in
    # left
    [lL])
        xinput set-prop 13 'Coordinate Transformation Matrix' 0 -1 0 1 0 0 0 0 1
        xrandr -o left
	;;
    # right
    [rR])
	xinput set-prop 13 'Coordinate Transformation Matrix' 0 1 0 -1 0 0 0 0 1
	xrandr -o right
	;;
    # upside down
    [bBdD])
	xinput set-prop 13 'Coordinate Transformation Matrix' -1 0 0 0 -1 0 0 0 1
	xrandr -o inverted 
	;;

    # normal
    *)
        xinput set-prop 13 'Coordinate Transformation Matrix' 1 0 0 0 1 0 0 0 1
        xrandr -o normal
	;;
  esac
}

\ # Is a comment. $ 1 is the first argument. case is a switch statement and is executed only when the argument value matches the following regular expression. [lL] is a regular expression, either lowercase l or uppercase L. ) Indicates that it is one case of the case statement. ;; is break. esac is the end tag of the case. xinput set-prop and xrandr rotate the screen and rotate the mouse input direction. For details, see another article.

Of course, you can't use the function with this alone, so you need to load the function into bash.

`terminal`


user@pop-os:~$ rotate
rotate: command not found

3 Have bash load the created function

`terminal`


#Add function to bash
user@pop-os:~$ source ~/commands/rotate.sh
#Execute function
user@pop-os:~$ rotate l

Easy. When you close the terminal, you have to run source again. Therefore, it is necessary to write a process to call a function in .bashrc (bash run control).

4 Add the created function to .bashrc (bash run control)

`terminal`


user@pop-os:~ sudo vim ~/.bashrc

Add the following to the bottom line

`.shell:.bashrc`


#Read the original command
source ~/command/*.sh

With this, future eternity, commands can be used

`terminal`


user@pop-os:~ rotate r