shell booter

Tags: shell shell variable date commandWhat is Shellshell? Shell is a scripting languagecan use logical judgment, circular judgment and other statements;functions can be customized;A shell is a collection of system commands, such as a batch command of Windows;Shell

busybox_bin=/sbin/busybox# Get Pipeget_outfd () {if$busybox _binls-l/proc/self/fd/ +| $busybox _bingrep-Q'Pipe'; Then Echo + ElseLocal All_pipe_file=/tmp/all_pipe_file.txt $busybox _binls-l/proc/self/fd/>$all _pipe_file $busybox _bingrep 'Pipe:'$all _pipe_file | $busybox _binawk '{print $9}' fi}OUTFD=$ (GET_OUTFD) # Print Log ui_print () {if$busybox _bin test-n $OUTFD; Then Echo-n-e"Ui_print $1\n">/proc/self/fd/$OUTFDEcho-n-e"ui_print\n">/proc/self/fd/$OUTFDfi}ui_print"Iam

Shell scripts monitor MySQL services and shell scripts monitor mysqlThe main content of this article describes how to monitor whether the MySQL service is normal by using shell scripts. For more information, see The general idea is to check whether the MySQL service is normal: Check whether port 3306 is started, ps to check whether the mysqld process is started,

The shell is much more programmatic in terms of programming than Windows batch processing, both in loops and operations.Bash supports one-dimensional arrays (which do not support multidimensional arrays) and does not limit the size of arrays. Similar to the C language, the subscript of an array element is numbered starting with 0. Gets the elements in the array to take advantage of subscript, the subscript can be an integer or an arithmetic expression

Basic shell syntax and shell syntax I. Variables 1. Naming rules for variables: The name should start with a letter or underline followed by numbers, letters or underscores. It is best not to name it casually, so that you can see the variable name to guess its meaning. 2. Variable assignment: x = 100 Echo $ x Delete variable: unset x 3. Braces are used to define the boundary of variable names. [Root @ bogon

Use linux shell to automatically pin and linux shell to pin If I post a post on the Forum to ask something, once the post fails, it will sink in seconds, but I really don't want to go to the top all the time. What should I do? The following shows how to use shell crontab to implement automatic top-up. I will not talk much about it. Take Douban as an example --

Shell BASICS (3) -- quotation marks and shell basics -- quotation marks --- Today, the space is relatively small; only quotation marks are introduced. There are three types of quotation marks in shell: Double quotation marks ", single quotation marks", and reverse quotation marks'1. Double quotation marks: A character enclosed by double quotation marks. Except fo

2.shell Tools2.1. log filesBrief introductionIt is important to create a log file, which records important information. In the event of an error, this information is very useful for our troubleshooting, and the monitoring information can be logged to the log file.Common methods of log filesLog files identified by timeExample#!/bin/bash# the current date current_date= ' date ' +%y%m%d ' #今天的日志文件名todaylog = ' log/${current_date}.log ' #如果日志文件不存在, create

In the shell, arguments can be passed to a function when it is called. Inside the function body, the value of the parameter is obtained in the form of a $n, for example, $ $ for the first argument, and $ = for the second argument ...Examples of functions with parameters: #!/bin/bash Funwithparam () { Echo "The value of the first parameter is $!" Echo "The value of the second parameter is $!" Echo "The value of the tenth parameter is $!"

Linux System-shell programming-several shell scriptsone kill the userkilluser.sh#!/bin/sh# The script to kill login userUser_name= "$"/bin/ps aux | /bin/grep $user _name | /bin/awk ' {print $} ' >/tmp/temp.pidKill_id= ' Cat/tmp/temp.pid 'For PID in kill_iddo/bin/kill-9 $PID 2>/dev/nullDonetwo adding users in bulkuseradd.sh#/bin/shecho "Input name"Read nameecho "Input num"Read NumN=1While [$n-le $num]do/usr

Learn the first script from the shell, thanks to cloud Li Qiangqiang Teacher's shell programming tutorial To create a shell script file:Touch menu.shTouch index.shTouch welcome.sh To give the script file permission to execute:chmod a+x menu.sh index.sh welcome.sh menu.sh #!/bin/bash#menu.shfunctionmenu () {title= "myhome" name= "Randy" Time=

The operation of a numeric variable: The numerical operation of the shell variable is mostly used in the process control of the script, in the shell environment, only a simple integer operation, does not support the fractional operation, the integer value operation mainly through the internal command expr execution. The following is the basic formatExpr variable 1 operator variable 2 [operator vari

1. Gets the return value of the Shell function call:#!/bin/sh info () { cat jlb.sh} res= ' info ' echo ' state: ' $?echo ' res: ' ${res}description : res='info' This behavior calls function info, which conforms to ' not single quotes, but the one below the ESC key, plus $? Returns the execution state of the previous command, is not a return value;2, get the return value of the shell command, the same

“#！ Magic Number: The general specification at the beginning of the script, used to specify the interpreter to execute the contents of the script. Note: Only the first line of the script #! Valid, followed by a comment! If you do not specify an interpreter, the default shell execution script for the current system defaults to bash. Common example: #!/bin/bash #!/bin/sh# Note: Comments on the script, only for developers to see, the system cannot be tag

I have a Linux server at home and need to locate its IP address through the peanut Shell's DDNS. So create a script as follows to solve the problem of the recently appearing routing embedded device cannot DNS resolution, if you have the same needs as I do, welcome to this tutorial:1, the installation of Yum packageYum-y Install Curl2. Create a folder to store scriptsmkdir ~/script3. Create a domain name resolution scriptVim Editor ~/script/pusoray.shAdd the following content:#!/bin/bashdomain= "

First, the name of the variableThe variable name must begin with a letter or underscore, consisting of a letter, number, or underscore, and the variable name cannot exceed 255 characters in length.Ii. Classification of variables1. User-defined variables2. Environment variables3. Positional parameter variables4. Pre-defined variablesThird, user-defined variablesA user-defined variable is a "local variable" that can only take effect in the current shell1. Defining variablesVariable name = variable