Shell script if statement nested instance

 

Design a prompt menu for user selection, and perform operations and display based on user selection.

Menu: 1. Start vi Editor 2. Start x-windows and enter the graphic interface 3. Start the background printing process. 4. Exit ctrl + c.

#! /Bin/bash // call the execution environment

# Filename: qiantao // name of the script file

Echo "please choose :( 1-3, or ^ C) // select

Echo "1 vi" // display output 1 item

Echo "2 x-windows" // display output 2 x-windows

Echo "3 print-file" // display output print

Echo "ctrl + c quit" // display the end shortcut key

Read xyz // save user input in xyz

If [$ xyz = 1] // determines whether the condition is 1.

Then // if structure statement

Vi // enable vi

Exit 1 // exit the program

Elif [$ xyz = 2] // determines if xyz is 2

Then // nested if

Startx // start x-windows

Exit 1 // exit

Elif [$ xyz = 3] // whether to exit is equal to 3

Then // if statement nesting

Echo "" // enter the printed file name

Read filename // read the file name

Lp $ filename & // print the file

Exit 1 // exit Printing

Else // if statement

Echo "---------------------"

/Bin/sh qiantao. sh // call the nested script

Fi

Execution diagram:

 

The next step is successful.

 

This article is from the "Happy first" blog