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Linux Shell script series tutorial (4): Add environment variables using functions
This article mainly introduces the Linux Shell script series (4): Adding environment variables using functions. This article introduces the knowledge of environment variables, the following des
complex code that makes it difficult for developers to read and modify them.
Usually, its syntax and interpretation are not so flexible, and not intuitive.
Its code is usually not used by other scripts. The code reuse rate in the script is very low, and the script usually solves some very specific problems.
They generally do not support library features, such as HTML interpreters or processing HTTP request libraries, because libraries are generally only in the popular language and
Linux Shell script series tutorial (7): script debugging
This article mainly introduces the Linux Shell script series (7): script debugging. This article describes the Bash built-in debugging and custom debugging functions. For more information, see
I. debug the script
Debug
Linux Shell script series tutorial (5): mathematical operations
This article mainly introduces the Linux Shell script series (V): mathematical operations. This article describes how to use let ,(()) and [] for arithmetic operations, use expr for arithmetic operations, use bc
This article mainly introduces the Linux Shell Script series tutorial (vi): array and associative array, this article explained what is the array and associative array, the definition prints the ordinary array, the definition prints the associative array and so on content, needs the friend to be possible to refer to under
One, array, and associative arrays
An a
This article mainly introduces the Linux Shell Script series (ii): The terminal printing instructions, this article focuses on the echo terminal printing, printf terminal print two print out output command, the need for friends can refer to the
Terminal printing
A terminal is an interactive tool through which users can interact with the shell environment. Print
Run the shell command in php in linux to view the server name. Today, we have a small requirement: how to display the server's machine name on the webpage. in Ubuntu, you only need to enter the command uname-n to see it (Redhat is the same ), so I wondered if php could meet a small demand today,
How to display the server machine name on a webpage,
In Ubuntu, you only need to enter the command uname-n to s
This article mainly introduces the Linux Shell Script series (v): Mathematical operations, this article explains the use of Let, (()) and [] arithmetic, using expr for arithmetic operations, using BC for arithmetic operations three ways, the need for friends can refer to the
Arithmetic operations are essential in any programming language, and the shell is no exc
This article mainly introduces the Linux Shell Script series (iii): Variables and environment variables, this article explained the common variable, get the length of the string, environment variables and so on, the need for friends can refer to the
First, topsy variables and environment variables
Variables are an essential part of any programming language and are used to hold variables of various types.
Tags: linux shell scriptShell Advanced StepConditional Select if statement to achieve conditional judgmentIf syntax: if Commands;then commands (if the command is true, the subsequent command will be executed, fi ends;)Elif Commands;then Commands (if the previous if is not true, then to determine whether the elif is true, the following command is true, you can write multiple elif, can be written without writ
This article mainly introduced the Linux Shell Script Series tutorial (Seven): script debugging, this article explained the bash built-in debugging function and the custom debugging function and so on content, needs the friend may refer to under
First, debug scripts
Debugging is one of the important features that every programming language should implement, and
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