Shell

1. #annotation function, #! ExceptIn addition, in the parameter replacement echo ${path#*:} here does not represent a comment, a numbering conversion, does not represent a comment echo $ ((2#101011))2.;Command line separator, you can write multiple

When using a virtual host before, look at the Web site run log, found a lot of abnormal malicious access. At that time because they do not have the system permissions can not be able to screen these actions. Now have their own cloud host, front-end

Principle and simplicity: recursion, iconv   code is as follows copy code #!/bin/sh tgt= "Source_rst" Function Fe_convert () {      for file in ' ls $ '     do         if [-D $/' $fi Le]         then        

When you just learned to write shell batches, there is no need to base your logic operations on the basics: arithmetic, here's a simple implementation method in the Linux shell.1. Simple method$ b=$ ((5*5+5-3/2))$ echo $b29In the Linux shell, we can

echo 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 background, 36 of the position is the color of the wordNote:1, the word

&& and|| Or# when two files are present[[email protected] ~]# ls 1.txt && ls 2.txt1.txt2.txt# 10.txt file does not exist[[email protected] ~]# ls 10.txt && ls 2.txtLS: Unable to access 10.txt: No file or directory[[email protected] ~]# ls 10.txt | |

First, log in to Git and create a new repositorySecond, in the "Repository name" column to fill in the name of the version of the warehouse, such as "test", description column is a description, can be filled.The default access is public, click the

Understand a dialect in the Linux Shell: 2>&12016-11-14 Du Yishu ObjectiveWhen using Linux commands or shell programming, this usage often encounters 2>&1 If it is just beginning to touch Linux, this thing really does not understand, because he has

The numerical computation of a variable is like a command.(()), let, expr, BC, $[]Here's a look at the operator of numeric calculations650) this.width=650; "Src=" Http://s5.51cto.com/wyfs02/M01/8C/92/wKioL1hwVHaicj-lAAEicHK4YyY296.png-wh_500x0-wm_3 -

#!/bin/sh mypath= "/var/log/httpd/" myfile= "/var/log/httpd/access.log" #这里的-x parameter Judging $ Whether the MyPath exists and has enforceable permissions if [!-X ' $myPath]; then mkdir "$myPath" fi #这里的-D parameter to determine if

(1) Command1;command2Use ";" , the Command2 is executed regardless of whether the Command1 executes successfully.(2) Command1 && Command2When you use &&, Command2 is executed only if Command1 executes successfully, otherwise Command2 does not

Echo ' 1.2*2 ' |BC++++++++++++++++ Digital ComparisonMode 1:Agm1=50Agm2=60If [3-eq 3-a ${agm1}-ne ${agm2}-a ${agm2}-gt ${agm1}-a ${agm1}-ge 50-a ${agm1}-lt ${agm2}-a ${AGM2}-le 60- o 4-GT 3]; ThenEcho ' Yes 'ElseEcho ' No 'FiMode 2:Agm1= ' ye 'Agm2=

1, read from file whileRead Line Do Echo "line= $line" Donefile. txt2, converts a string to an array, and iterates through STR="html, CSS, JavaScript, java, PHP, go, python"arr= (${str//,/ }) forIteminch${arr[@]} Do Echo "item= $item" Done3,

Shell Scripting Ideas: (Requirements analysis)1, lamp source One key integration=======================1) Install Apache, Mysql, PHP, lamp integration;------------------------Installing ApacheInstall MySQLInstall PHP-------------------------2) to

1.psReview the process. It only shows the processes that are currently user-owned under the current console, including bash and PS commands themselves.2.topReal-time detection process. The first line of the output shows an overview of the system

First, the basic writing process of the practice script:1. Determine the task and the command to complete the task2. Scripting Integration Tasks3. Authorization and test executionSecond, exercise:A. First I create a directory, put the script we

Under BASH2, you can use the ($ ()) combination to obtainVar= ($ (cat/etc/passwd |awk-f ': ' {print $} ' |head-3))Returns the full value of the array:Echo ${var[@]}OrEcho ${var[*]}To take an array of members:echo ${#var [@]}Orecho ${#var [*]}Take a

First, the installation instructions for the CentOS 5 example1, install the necessary development kits [[email protected] ~]# yum install gcc gcc-c++ autoconf automake2. Download phddns-2.0.2.16556.tar.gz to a directory [[email protected] ~]# wget

The script is as follows:#! /Bin/bash# Nginx access log segmentation shell script# Log DirectoryLog_dir = "/usr/local/nginx/logs /"Cd $ log_dirTime = 'date + % Y % m % d -- date = "-1 day "'# Log Retention daysSave_days = 15# Location where the log