Shell

1.manAccess the manual pages stored on your Linux system. You can use the Man command to view a command.Eg:man ls man Mans2.cdSwitch directories. The path to the directory has an absolute path and a relative path.EG:CD. Switch to upper-level

# free-m |awk ' nr==3 {print $NF} '4012#!/bin/bash Scriptused_mem= ' free-m |awk ' nr==3 {print$nf} 'If [$used _mem-lt 5000]Thenecho "Mem is not enough, $used _mem."echo "Mem is not enough, $used _mem." | Mail-s "MEM Warning $ (data +%f)" [email

#!/bin/bashif [!-n "$"];thenEcho-e "Usage: $ PATH"Exit 30Fi#T_P =$ (PS aux |grep "$" | grep-v-E "Grep|tomcat_path" |awk ' {print $, $ (NF-3)} ' |sed ' s/-dcatalina.home=/--/g ‘)echo "-pid-------------------PATH----"PS aux |grep "$" | Grep-v-E

This article from: http://www.cnblogs.com/puresoul/p/5092628.htmlPrevious jmeter Bean Shell Use (a) a brief introduction of the bean shell in the next jmeter, this article is a supplement to the above, the main summary of the several commonly used

vim/etc/resolve.conf View DNS6.shell script Commands1.diffDiff file File compares the differences of two files-C Displays the surrounding rows-U generates patches in a uniform output format-R comparison of files in two directoriesPattch file

Basic knowledge of Shell programmingThree ways to empty a log1.echo Cary >test.log>test.log2.echo Cary >http://www.qixoo.qixoo.com/test.logEcho >test.log3.echo Cary >test.logCat/dev/null >test.logShell scripts are good at working with plain text

Conditional judgment in shell programmingConditionsIf-thenCaseIf-thenSingle conditionif commandThenCommandsFiWhen the command return code is 0 o'clock, the condition is setif.sh#! /bin/Bashif Date Then Echo "command EXEC"fiifdate123 Then

About SEQThe SEQ command is used to generate all integers from one number to anotherseq 1 5 Output 1-512345seq 5-1 1 Reverse Output 1-554321[[email protected] ~]# seq 1 2 //output 1-10 and output once every two digits 13579seq 9-2

This article will aim to implement regular automatic backups of the MySQL database, and introduce the perfect collaborative process between shell scripts and scheduled tasks. Where the shell script is responsible for the specific backup operation,

#!/bin/bash#! Delete duplicate files with identical contentsLs-ls--time-style=long-iso | awk ' begin{Getline;getline;Name1=$8;size=$5}{name2=$8;if (size==$5){"Md5sum" name1 | getline;csum1=$1;"Md5sum" name2 | getline;csum2=$2;if (csum1==csum2){Print

Recently need to do a distributed architecture of the site, is currently in the debugging phase, each time the boot to start a lot of tools, such as Zookeeper, ACTIVEMQ, Redis, Nginx and so on, take pains.Search the Internet on the Mac how to set up

After running the script, enter Yes to install automatically#!/bin/bashport= ' Netstat -lnp|grep :21|wc -l ' Check_ok () {         if [ $? -eq 0 ];then        echo   "Check ok" elseecho  "check error "  && exit          fi}read -p  "auto install ftp 

Before writing this shell, let's talk about how the stat command is usedFirst, about time stampEach file has 3 of the time (called timestamp timestamps), for these 3 kinds of time, many times easily confused, so here to explain:  Access Time ( Atime)

Because the shell appears to be a common feature between UNIX systems and is standardized by POSIX. As a result, shell scripts can be applied to many systems once they are "written attentively". Therefore, the reason to use shell scripts is based on:

# awk ' Condition 1{action 1} Condition 2{action 2} ... ' File namecondition (Pattern):Generally use relational expressions as conditions x > 10 to determine if a variable x is greater than 10x>=10 greater than or equal to xactions

definition of shell and function1. Linux Shell functionsform a set of command sets or statements into an available block, These statement blocks are called functions. 2. composition of Shell functionsFunctions Name: Function names, note that the

Vim commandReplace:%s/aaa/bbb/%s/aaa/bbb/gRegular Expressions:^ Opening$ end[0-9] Number[A-z] lowercase[A-z] capitalization[^a-z] Non-lowercase{1,3} 1 to 3 times. Any single character, except \ r \ n* 0 times to several times? 0 times to 1 times+ 1

Shell scripts can be seen as a stack of commands, implemented by combining command flow control mechanisms.The interpreter #!/bin/bash or/usr/bin/python is also known as ShebangThe generic script needs to give execution permission, or you can use

Using Sh-x or this bash-x, you can debug a script that outputs and outputs a state for each row while debugging, and It also shows the order in which the commands in the script are executed . You can also use set in the script to set the debug area.

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