what in shell

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Use of the special variable IFS in shell and its value is $ & #039; \ n & #039; and & #039 ;\\ n & #039, shellifs

Use of the special variable IFS in shell, and the difference between the value of $ '\ n' and' \ n', shellifs When a for loop is used in shell, the IFS is also used to define the separator. To specify multiple IFS characters, you only need to

Function Definition and control statements in shell

1. The Function Definition Format in shell is: Function name (){ # Function body } The function definition must follow the principle first defined in use, such as defining the function print #!/bin/shfunction print(){if [ $# -lt 1 ]then print “no

Special variable IFS in shell

Special variable IFS in shell As I get used to the writing style of python, I often want to use bash to traverse the lines of a file and process the lines read. But in a strange situation, if my text is similar to this The first line.The second

Braces and parentheses in shell

The braces and parentheses in shell I want to talk about here are several types of shell parentheses, the structure of braces and the variables in parentheses. The command usage is as follows: www.2cto.com 1. $ {var} 2. $ (cmd) 3. () and {} 4. $

Scope of script variables and function variables in Shell

The scope of the script variables and function variables in Shell defines the function in shell to modularize the code and facilitate code reuse. However, the variables and functions of the script itselfThe scope of the variable may be confusing.

Test switch and special parameters in Shell script, shell script

Test switch and special parameters in Shell script, shell script1. Test Switch The following table lists the meanings of the test commands and whether they can be used in test commands, bash, and ksh. Switch Test Bash Ksh

Learning shell script programming (Issue 1) _ using variables in Shell programs

Variable assignment Variable access Variable input  4.1 variable assignment In shell programming, all variable names are composed of strings and do not need to be declared. To assign a value to a variable, the format is as follows: Variable

Differences between export in shell and makefile

In shell, you can use export to modify the environment variables of the current process. For example,Export Path =.: $ pathYou can add the current path to the executable file search path, so that you do not need to press "./excutable" to execute the

Commands commonly used in shell scripts: wget, Curl, SS, Lsof, Nmap, NC, netstat, telnet

Commands commonly used in shell scripts: wget, Curl, SS, Lsof, Nmap, NC, netstat, telnetLab Environment Description:(1) The port used by the remote Nginx Server Ip:192.169.5.136,nginx service is 80;(2) ip:192.169.5.121 of local CeshijiCommon

echo Display content color in shell script

Reprint: http://www.cnblogs.com/lr-ting/archive/2013/02/28/2936792.htmlecho Display in shell script with color display, echo display with color, need to use parameter-EThe format is as follows:For example:Where 41 of the position represents the

Variables in shell programming

A variable is a quantity whose value can vary; In essence, a variable name is a memory space for storing data;The variables have local variables and environment variables;A shell variable is a weakly typed variable that does not need to specify its

command in Shell replaces $ (...) The difference and connection with the post-reference ' ... '

I. Command substitutionA. in Bash, $ () and ' (anti-quote) are used for command substitution.B. command substitution is similar to variable substitution, which is used to reorganize the command line, complete the command line in quotation marks, and

Some of the special symbols and functions that are common in shell scripts

This article mainly introduces some special symbols and its function in shell script, summary is very concise, easy to understand, the need for friends can refer to the next In writing shell scripts, we need to use a variety of special symbols,

Easily master the common usage and examples of arrays in shell programming

Origin: In the old boy Linux training shell programming teaching, found a lot of good level of friends and classmates are still very confused, the following for everyone to share the use of the array of small examples, I hope to give you a little

Execute SQL statement action in shell script

This article mainly describes the shell script in the execution of SQL statements 5 ways to operate MySQL, this article explains the SQL statement embedded directly into the shell script file, the command line calls a separate SQL file, using the

Some special variables in shell scripts

In shell scripts, there are some common special variable representations that need to be known.Here are some of the frequently used special variable representations:$ Current PIN name$ ... Parameters of the incoming script or function (greater than 1

Logical judgments in shell scripts, file directory attribute judgments, special use of if, case judgments

1. Logical judgment in shell scriptsFormat 1:if condition; then statement; FiFormat 2:if condition; then statement; Else statement; FiFormat 3:if ...; Elif ...; Then ...; else ...; FiLogical judgment expression:if [$a-gt $b], if [$a-lt 5], if [$b-eq

Shell script description, shell script structure and execution, date command usage, variables in shell scripts

Shell Script Introduction Shell is a scripting language Aming_linux (public number) blog.lishiming.net (blog) You can use logical judgments, loops, and other syntax Functions can be custom-defined The shell is a collection of system

Logical judgments in shell scripts, file directory attribute judgments, if special usages, case judgments

Logical judgments in shell scriptsFormat 1:if condition; Then statement; FiIf a>3, output OK#!/bin/basha=5if [ $a -gt 3 ]then echo okfiFormat 2:if condition; Then statement; else statement; FiIf the a>8 output is OK, the output

Single quotation marks, double quotation marks, and reverse quotation marks in Shell

In shell, there are three types of quotation marks: single quotation marks, double quotation marks, and reverse quotation marks. Single quotation marks 'all characters enclosed by single quotation marks are common characters. When special characters

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