How to write scripts in linux

Shell is both a command interpretation tool and a script programming language. You can use various shell commands and some specific grammatical structures to form a Shell script program. The shell script program is a plain text file. , let’s take a look at how to write scripts in Linux.

How to write a script in Linux

1. Open the terminal, enter the directory where the program is saved, and enter # on the command line ## vi test.sh (The suffix of the Shell script program is .sh, .sh is for people to see, you can also name it .txt or do not write the suffix)

2. In Shell programming, the characters after # can be used as comments, so we can write some comments in the program. Note that # needs to be declared in the first line of the program! /bin/bash(csh,zsh..), use #! Used to show that our program is executed using bash

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3. A simple script program is written here as follows

Program part

#4. You can run it directly after writing. ./ represents the current directory, enter

./ When test.sh is executed, you will find that there is no permission (permission denied). Then we grant ourselves permission and we can run it.

A small Shell script was successful.

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