Shell's/bin/bash script base combat

I rookie a, first contact with the Linux shell script;

Shell script, the simplest function is to write a lot of instructions together, so that users can easily be able to execute multiple commands, and shell script provides arrays, loops, conditions and logical judgments and other important functions, so that users can directly to the shell to write programs, Instead of using the syntax written by traditional programs like the C programming language.

Benefits of Shell scripting:

In some complex Linux operations, a large number of repetitive input and interaction operations can be done through Shell script batch processing, automated maintenance, thereby reducing the cost of labor.

The Linux shell script is a special kind of application, the common shell has many kinds, the view way can use Cat/etc/shells or chsh-l,:

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There are differences in the way the internal instructions are prompted by different shell scripts.

To write a shell script:

The operation commands, which are written in the usual order, are placed in the. Sh script file and given execute permissions. can be used normally.

Here's my first shell script:

Execute the command #vim first.sh enter "I" for editing.

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#！ /bin/bash, in order to declare, writes the bash language, using the bash interpreter.

# This is my Firsh test script files. (Note information: Annotate the role of this script, in order to make a description in the production environment when other people see the script.) ）

Mkdir/root/test Use the mkdir command to create a test directory under the/root/directory.

After creation, then execute ifconfig to view the IP information of the next machine.

There are 5 output modes, the following are common in the production environment (do not need to add the script to execute permissions):

1: #sh firsh.sh

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2: #source firsh.sh

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Now formally open your Shell's first script, hoping to help you.

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Shell's/bin/bash script base combat