Shell

Shell variables are divided into environment variables and custom variables, the difference is whether the variable can be used in the quilt process, look at the following diagram: If you are an environment variable, you can continue to use it in

In Linux shell programming, date addition and subtraction operations are often used I used to calculate myself through the expr function, which is troublesome. In fact, the date command itself provides the addition and subtraction of dates. Very

Learn shell programming, every time to do a test, always create a file, give permission, file each edit also write a #!/bin/bash, when the test files are more, still have to organize, or move, or delete ... Kiss, don't bother ... Here are some of

Example: adb shell Sendevent/dev/input/event3 1 $ ((0XCA)) 1The above statement contains $ ((0XCA)) and executes Runtime.getruntime (). EXEC ("Sendevent/dev/input/event3 1 $ ((0XCA)) 1") without error, but will not take effect, the workaround is:(1)

First, the use of ReadFunction: Read input of keyboardUsage:　　①, simple shell read;　　　　Note: If you do not add a variable after read, the default assignment is to reply[[email protected] opt]# Read (no add variable name after read, default

What is a regularA regular is a way to describe a character or string by combining symbols with special meanings, called regular Expressions . Or, the regular is the rule used to describe a class of things.in Linux, wildcards are interpreted by the

#!/bin/bash# #获取目标目录target =/mnt/sysroot# Command copy function cmndcopy () {        # If the order does not exist,return 1        if ! which $1 & > /dev/null; then                 return 1        fi          #获取命令决定路径         cmnd=$ (which --

Previous Article JMeter Bean Shell Use (i) 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 scenarios and methods, I believe these basic can cover

When writing a shell script. By changing the shell's display color, you can not only change the experience of using the shell terminal, but also more useful, you can distinguish the normal output by changing the color of the display content. Output

1 execution of a sequence of commands[Email protected] log]# (A=2;echo $a)2[email protected] log]# {A=2;echo $a;} #注意格式的不同, with a space on the left and a semicolon ending at the far right2The redirection of a command within 2 () and {} Brackets

Look at a little script#!/bin/bash#demonstarting the shift commandcount=1while"$" Do "Parameter # $count =$1" Count 1] ShiftdoneechoechoThe script first tests whether the first parameter exists as- n "$" , prints if it

#!/bin/shAa= ' \e[1;31m 'bb= ' \e[1;32m 'Cc= ' \e[1;33m 'Dd= ' \e[1;34m 'Ee= ' \e[1;35m 'ff= ' \e[1;36m 'gg= ' \e[1;37m 'res= ' \e[0m 'Cat () {Echo-e "${aa} ===================================== ${res}"Echo-e "${DD} ======== 1.mysql function look ===

#!/bin/shCat () {Echo-e "${aa} ===================================== ${res}"Echo-e "${DD} ======== 1.mysql function look ====== ${res}"Echo-e "${ff} ======== 2.samba function look ====== ${res}"Echo-e "${CC} ======== 3.postfix function look = = =

In the process of writing shell scripts, we often need to process text files using the SED flow editor and awk. First, what is SED?Sed is an online editor that processes a single line of content at a time. SED is a non-interactive editor. It does

#!/bin/bash#auto Install Zabbix#by Max 2017zabbix_soft= "Zabbix-2.0.6.tar.gz"Install_dir= "/usr/local/zabbix/"server_ip= "192.168.0.100"ip= ' Ifconfig|grep Bcast|awk ' {print $} ' |sed ' s/addr://g 'Server_install () {Yum-y Install Curl Curl-devel

Arithmetic operations are undoubtedly very important in shell scripting programming;The command to perform an integer arithmetic operation in bash is let, which has the syntax format:Let Arg ...Arg is a complete arithmetic expression consisting of a

The main command for the following script is:CD $TARGET _dir/$YEAR/$MONTH/$DAY; tar-g $TARGET _dir/snapshot-czvf $FILES ${source_dir[@]} # #创建好的备份目录中, execute backup command, Here is an example of a complete

As a result of the work to cross-compile the application from the PC repeatedly, and through TFTP download to the ZYNQ board to run debugging. Repeated knocking commands are too cumbersome, so write a script to automate the download, change

First, write a message reminding the Python file#!/usr/bin/python#-*-coding:utf-8-*-ImportSYSImportSmtplibImportEmail.mime.multipartImportEmail.mime.textserver='smtp.163.com'Port=' -'defSendMail (server,port,user,pwd,msg): SMTP=Smtplib. SMTP () smtp.

In the process of writing the Shell Daily , the array is a very common content. Here we briefly describe how the two arrays are used. A regular array, an associative array. The difference is a regular array, which can only be accessed using integers