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

The 1.expr command is generally used for integer values in the general format:Expr argument operator argumentThe general usage is to do arithmetic operations using expr, such as:[[email protected] ~]# Expr 10 + 2030$expr 30/3/25(Note that operators

# 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

1. Define variables: In order to avoid conflicts with environment variables, generally lowercase: such as pp= "mydql,kdkfeof";Second assignment scheme:The calling variable uses the $ symbol:Variable overlay:2. The output uses ECHO, as shown in:3.

"Topic link" http://acm.hdu.edu.cn/showproblem.php?pid=5730"The main topic"Give An array w, representing the weights of the fields of different lengths, such as W[3]=5, if the field length is 3, then its weight is 5, and now there is a field of

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

Accessing HBase, and manipulating hbase, commands do not use semicolonsHBase Shell enters HBaseList View TableHBase shell-dHBase (main):024:0> scan '. META. '============= Small Example ===================================================1. Create a

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,

1. The most straightforward and straightforward judgmentWithout those if statements, directly shorten the amount of code.2. The variable is caused by "" quotation marksAs shown below:, you can get the result is NULL.#!/bin/sh a= if [!-n "$a"];

Open a text editor, create a new file, the extension sh (sh for Shell), the extension does not affect the execution of the script, see the name is good, if you write a shell script in PHP, the extension is good with PHP.Enter some code:

One, DF (File System view command) [[email protected] ~]# DF [option] [Mount point] option:- A displays all file system information, including special file systems such as/proc,/sysfs-H , using the customary unit display capacity, such as KB, MB or

chmod 755 demo.sh./demo.sh 1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465 6667686970 #!/bin/bash# Author:James 2016-10-15# 集合以空格分割fori in 1 2 3 4 5 6    do   

Linux+shell acquiring and copying the latest data to remote devicesOur remote general copy of the data are created by the shared secret key, so that the copy of the words do not have to enter a password, specifically, I can refer to the previous

First, IntroductionThe shell is the command-line interpreter that the user interacts with the operating system.There are many kinds of shells:bash, csh, sh, ksh 、、、The command line we saw when we waited for Linux was a bash.Two, the first

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

1. Man helps explain commands you are familiar with or unfamiliar with Eg:man ls to view LS-related usage Note: Press the Q key or CTRL + C to exit, under Linux you can use CTRL + C to terminate the current program run. 2. LS to view the

First:For tar in *.tar.gz; Do tar xvf $tar; DoneFor tar in *.tar.bz2; Do tar xvf $tar; DoneSecond: Bulk unzip all tar.gz files in a folder with the tar commandLS *.tar.gz | Xargs-n1 Tar XZVFThird: find-maxdepth 1-name "*.gz" |xargs-i tar xvzf {}This

Requires the target machine to have the expect command installedDivided into five files config.ini (config file), id_ras.pub (public key), read.sh (a function for reading the configuration file), test.sh (execution file), run.sh (remote run script)

Reprint please indicate: http://www.cnblogs.com/winifred-tang94/If conditional statement syntax:If [conditional expression]ThenCodeElseCodeFiNote : In the IF condition statement above, there should be a space between if and [, and the conditional

The company recently built Jenkins on Windows, but the release was published to a Linux server, so there will be a problem with executing the shell command on the automatic deployment, and then looked for it;Discover that Jenkins has a plugin for