Shell

Original address: http://blog.chinaunix.net/u/21908/showart.php?id=1420565 reference * Learn Bash Shell 3rd edition 6.4. Arrays You can also use array variables in Bash, which are assigned two types of values:(1) name = (value1 ... valuen) at this

Question: For string output such as ' 1,2,3,4,5 ', separate 1 2 3 4 5 Feature: no spaces in string Workaround 1: #!/bin/bash var= ' 1,2,3,4,5 ' var=${var//,/} #这里是将var中的, replace with space for element in $var do echo $ Element done

Write: The shell script is actually a plain text file (ASCII), and we can edit the file to help us execute multiple instructions at a time, or use some operational and logical judgments to help us achieve certain functions. The same considerations

1. String judgment STR1 = str2 When two strings have the same content, the length is true STR1!= str2 is true when strings str1 and str2 are unequal -N str1 True when the length of the string is greater than 0 (string not empty) -Z str1 True when

[Root@centos65 liumengyang]# cat test.sh #!/bin/sh #if The process Exists,kill it pid=$ (Ps-ef|grep java| awk ' {print $} ') pidname=$ (ps-ef|grep java|grep-v ' grep ' |awk ' {print} ') #judge If the process is Running.if Not,restart. If

The sort command sorts multiple rows of data in a behavior unit.For example, there is a text file Test_sort, which has five elements, using the sort command, the five elements can be sorted in dictionary order from small to large.If the sort command

Positional parameters can be moved left with the shift command. For example, shift 3 means that the original $ $ is now $, the original $ $, and so on, the original $ $, $ $, $ $ no move. The shift command with no parameters is equal to shift

Gzexe Installation and use The system is self-contained with no installation required.Use the following command to encrypt: Gzexe tesh.sh After the encryption is complete, test.sh is the encrypted file, while the source file is backed up as test.

After you understand the basic statements, you need to implement your own ideas. Start to do some judgment on the condition of learning. Test Test is an expression of a shell program that can be conveniently tested with strings, file states and

Often to deploy multiple servers above the application, if a machine's login too cumbersome. All just think about writing a script to deploy different servers Prerequisites: Configuring SSH Login Free If not, please join me in another article http://

1. Edit detailappbackup.sh Input: #!/bin/sh#copyright (c) 2010-2011 Luoch (luocheng.cn@luocheng.cn) #Backup The detail files and update, clear logs#version 0 .1.1echo "= = Start deleting logs = =" Rm-vf ' find/opt/apache/htdocs/detail/app/log-name '

First, there is only one type of string in the shell, no shaping or floating-point type. However, when you define a variable, you can use single quotes, double quotes, and no quotes. Without quotes, if the variable has a white character inside it,

Recently started to learn bash shell, I do not know where to start, do not know what a good tool package to learn it. First Look for: yao@wuyao:~$ Apt-cache Search BashApparix-console-based Bookmark Tool for fast file system navigationBackup-manager-

1. startup file: service-restart.sh #!/bin/sh # java ENV source/etc/profile export java_home=/usr/local/jdk1.7.0_75 export jre_home= $JAVA _home/jre if [$# != 3]; Then echo "USAGE: $ service_dir service_name_pre disconf_env" echo "e.g.:

First, the user login into the system after the system environment variables: $HOME user's own directory $PATH directory to search for when executing commands $TZ Time Zone $MAILCHECK every few seconds to check for new letters $PS 1 The prompt

An application system every day to insert data to the database, and for very early data need to be cleaned from the database, to prevent unlimited data increase, the cost of storage and impact data query efficiency. Implemented through two files,

The 1.expr command is generally used for integer values in the general format: Expr argument operator argument The general usage is to do arithmetic operations using expr, such as: [Root@centos ~]# expr 10 + 20 30 $expr 30/3/2 5 (Note that operators

Shell to bulk modify file name under folder: Parameters: Incoming file path, such as: $./batch_rename_files.bat /home/xx/channel/ #!/bin/bash echo "Start programming ..." # #for i in ' ls * ' CD $ # #for i in ' ls-r | grep "erl*" '

First, the shell concept shell本身是一个用C语言编写的程序，它是Linux系统的用户界面，提供了用户与内核进行交互操作的一种接口。shell既是一种命令语言，又是一种程序设计语言。作为命令语言，它交互式地解释和执行用户输入的命令；作为程序设计语言，定义了各种变量和参数，并提供了许多在高级语言中才具有的控制结构，包括循环和分支。 它虽然不是Unix/Linux系统内核的一部分，但它调用了系统核心的大部分功能来执行程序、建立文件并以并行的方式协调各个程序的运行。

Declare-r variable name = variable 1+ variable 2[Email protected] test]# aa=11[Email protected] test]# bb=22[Email protected] test]# declare-i cc= $aa + $bb[Email protected] test]# echo $CC33[[email protected] test]# dd=$ (expr $aa + $bb) Note: