Shell

In a shell script, you can perform numerical calculations,如加减乘除，通过expr、let、(())等完成，文章介绍：http://blog.csdn.net/longshenlmj/article/details/14166193但是上面的运算只支持整数。小数计算怎么办？Shell small number calculationComplete with Bc,awk and Nawk tools, etc.The code for

Control and deletion of processesUseKillcommand to terminate a process.usually,terminating a foreground process can be usedCtrl + CKey,However, for a background process, you must use theKillcommand to terminate,we need to first

The Shell has three kinds of if ... else statements:1.if. FI statement;2.if ... else ... fi statement;3.if. Elif ... else .... fi statement.If ... fi statementSyntax for the IF ... else statement:if [Expression] Then If Truefi Note: There must

ip= "192.168.5.166"SSH $ip-o stricthostkeychecking=no//SSH login do not enter "Yes"Port= "26092"Pid= ' Netstat-anlp|grep $port |awk ' {print $7} ' |awk-f '/' ' {print '} 'Pname= ' ps-ef|grep $pid |grep-v grep|awk ' {print $NF} 'Dir= '

Spatial information for file systemsDF CommandDfcommand provides a single-line summary,a row shows the used and available space for a loaded system of asking the price.the unit depends on the system,some use blocks,some of them areKB.Most modern

1. Create a script that can add script information to other scripts:#vim cs.sh#!/bin/bashCat > $ #!/bin/bash#Name: ' BaseName $ '#Description:#Author: TEST#Version: 0.0.1#Datatime: ' Date ' +%f +%t "'#Usage: ' BaseName $ 'EofVim +8 $2. Modify the

The simple use of the remote SCP file shell expect is implemented in shell scripts with expect http://myunix.blog.51cto.com/191254/1095074http:// Jie-hui-520.blog.163.com/blog/static/60074301201022610217249/linux rsync Synchronous Practice Http://my.

Node version: v0.12.4When installing NPM install-g-supervisor is present:NPM err! AddLocal Could not install D:\Program Files\nodejsNPM err! Windows_NT 6.3.9600NPM err! argv "D:\\Program files\\nodejs\\\\node.exe" "D:\\Program files\\\\node_modules\\

The system is Ubuntu 14.04 64bit, previously wanted to install stream to play dota2, but eventually did not succeed. Because stream is only 32bit, a large number of 32bit libraries are installed when the stream is installed. Delete the stream, these

Shell Script (iii)2. File sorting, merging and segmentation(1) Sort command#-c: The test file is sorted;-K: Specifies the sort field;-M: merges two sorted files;#-n: Sort by number size;-o: Writes output to file;-r: Reverses sorting results#-t:

No matter what programming language is inseparable from conditional judgment. The shell is no exception.The approximate format is as follows:If List ThenDo something hereElif List ThenDo another thing hereElseDo something else hereFiAn

I. Basic conditions of judgment1) Logical operators-A expr1-a expr2 logic and-O expr1-o expr2 logic or! !EXPR1 Logical Non-2) Numerical judgment-eq num1-eq num2 is equal-ne Num1-ne num2 is not equal-GT NUM1-GT num2 is greater than-ge Num1-ge num2 is

Task Command combination 1 Delete a 0-byte file Find. -type f-size 0-exec rm-rf {} \;Find. Type F-size 0-delete 2 View processes, sorted by memory from large to small PS-E-O "%c:%p:%z:%a" |sort-k5-

The 1 script is as follows[[email protected] ~]# vim 99.sh #!/bin/bash # 9*9 Table # 2015.5.26 by Luzhi for i ' {1..9}do for J ' {1..9} do If [$j-le $i] then c=$ (($i * $j)) ECHO-E-n "$j * $i = $c \ T" fi do echo "" Done2 Operating effect650)

#!/bin/sh#count memory_used_rate,disk_used_rate # @yuanwb  2015-5  #disk_used_rate #depend  on real storage place the parameter  ' Location '  need to  Alter. location=/dev/sda1disk_used_rate1=$ (df -h | grep  $Location  | awk  ' {print $5} ') free1=

#!/bin/sh#count memory_used_rate,disk_used_rate # @yuanwb  2015-5  #disk_used_rate #depend  on real storage place the parameter  ' Location '  need to  Alter. location=/dev/sda1disk_used_rate1=$ (df -h | grep  $Location  | awk  ' {print $5} ') free1=

Business backgroundThe schedule.sh script is responsible for scheduling the execution of the user's trajectory engineering script, and intercepts some of the code as

First, experimental hours: 2 hours second, the purpose of the experimentV is familiar with the Redhat_linux user interface and makes common system settings.V Master the Common shell commands.Third, the experimental environmentV A computer running an

Wrote a script to view the APK signature with the shell. The code is very small and simple.Supports recursive directory queries#!/bin/bash# how to use the./getcertificate.sh xx.apkget_signature () {path= ' jar tf ' $ ' | grep RSA ' #查找apk中RSA文件 jar

first, direct insertion sortStability, time complexity: preferably O (n), worst O (n^2), average O (n^2). Space complexity O (1)void Insertsort (int l[], int n) {int I, j,key;for (i = 1; i= 0 && Key two or two points insert sortFinds the insertion