Shell

1111111111111 simple command script to clear messages log file under/var/log/var/log/the log file when the system files, must have root permissions:$UID is the global variable of the system:Make && make install indicates that the previous success

Http://www.linuxidc.com/Linux/2014-12/110463.htm#!/bin/bash#定义颜色的变量Red_color= ' \e[1;31m ' #红Green_color= ' \e[1;32m ' #绿Yelow_color= ' \e[1;33m ' #黄Blue_color= ' \e[1;34m ' #蓝pink= ' \e[1;35m ' #粉红res= ' \e[0m '#需要使用echo-EEcho-e

Transferred from: http://blog.csdn.net/jingxiangren/article/details/4745631In Oracle, the Dbms_job package can be used to perform PL/SQL procedures, which are required at the operating system level, such as backups, to be performed at the OS stage

Numerical calculation of ①shell$[[space] $a [space]operator[space] $b [space]]The calculation operator and its operands must be enclosed in square brackets [], followed by $ as a leader, and [space] means that spaces are dispensable here.Eg: ' A=2;b=

http://blog.chinaunix.net/u1/53027/showart.php?id=482234The special symbols commonly used in the shell are listed below:#;    ;;        .      ,         /        \         ' String ' |        !    $    ${}     $?       $$    $*          "string" *   

There are two recent problems with insufficient database connections, usually reserved for some session increase, but in some special cases such as connection storm, if there is no rate limit in the monitoring, a huge impact on the database may

Recently a project needs to write a Linux shell script, in the Linux specified directory to traverse the *.sql file, if any, execute the file (inside the file is an UPDATE statement), when traversing the folder always reported a [Sql:not found error,

Once the trap catches the signal, there are three ways to react:(1) Execute a procedure to process this signal(2) The default action to accept the signal(3) Ignoring this signalthe trap provides three basic forms for the above three ways:The first

Conditional statements1#!/bin/Bash2 3Read-p"input your name:"name4 #第一种判断5 if["$name"=="Mike" ];then #注意这里用 [...] When comparing two strings, the variable $name quoted, and there are spaces on both sides of "= ="; "[" followed by a space; "]"

Test-judgedSee below:1 Echo " exist " Echo " Not exist "Determine if/opt/a.txt exists, output exist, otherwise output not existTest also has many uses: A "file type" judgment about a file name, such as TEST-E filename indicates whether or not it

String-related operations are often involved in the shell batch process. There are a lot of command statements, such as: awk,sed can do string various operations. In fact, the shell built a series of operating symbols, you can achieve similar

Environment variablesSome commandsVarious environment variables often appear in shell scripts, so to write a script, you must first understand the environment variables. Common commands for handling environment variables are listed below

Before the concept of variables and logical operators, you can write a judgment statement, but here note that the two sides of the brackets must be left blank, or error.Operator Assignment, with a let statement, such as Let "a=1"

In Linux systems, the two most important files for user account management are/etc/password and/etc/shadow.In the/etc/password file, each line represents an account, but there are many accounts that are system accounts. Like what:Bin, ADM, etc., as

This article mainly introduces some special symbols and its function in shell script, summary is very concise, easy to understand, the need for friends can refer to the next In writing shell scripts, we need to use a variety of special symbols,

Shell implementation Associative array Shell implementation Associative arrayWrite the input and output of the array with the shell; there is a file, the first list of host names, the second column IP address, how to enter the hostname return IP

Shell implementation Associative array Shell implementation Associative arrayWrite the input and output of the array with the shell; there is a file, the first list of host names, the second column IP address, how to

Java calls Bash shell script blocking small problem resolutionBackgroundUsing Java implementation of the Web side, the web side of the corresponding user interface operation, using Java Call Bash implementation of the shell script to do the actual

Project structure such asOne: System environmentThis machine: 10.4.18.3Server: 10.4.18.4, user name: WEB02Two: Initializing the server environmentCreate a directory on the server's home directory Deploy,deploy/profileMkdir-p/home/web01/deployMkdir-p/

Shell Step by Step (2) -- Variable, stepvariable3. Variable declaration readonly read-only export modification or printing environment variable export-p display current environment[Note] Note that there must be no spaces before and after the