Shell

1, to determine whether the child process execution end Sometimes after we invoke the shell in Java, the subsequent operation can only continue if the process subprocess ends normally, so we need to determine when the process processes are

Cat >forallhost.sh#!/bin/bashFor i in {1..9}Do/usr/bin/expect autoyes.sh $iDoneCat >autoyesmkdir.sh#!/usr/bin/expectSet time 1Set I [lindex $argv 0]Spawn ssh 192.168.4. $i "Mkdir/root/.ssh"Expect {"Password:" {send "123456\n"}"#" {Send "hostname\n"}}

Shell echo CommandThe echo command of the Shell is similar to the echo command of PHP, and is used for the output of strings. Command format:echo stringYou can use echo to achieve more complex output format control.1. Display normal string:echo "It

First, Shell script introductionThe shell is a scripting language, and the shell is a collection of system commands1, can use logic judgment, cycle and other grammar;It's a bit like C language, but it's fundamentally different.2, can be customized

Click to view the original blog.sedis the abbreviation for Stream editor, which is a non-interactive stream editor for filtering or converting text.Not to be continued ...ProfileSed Options ... Script [Input File ...]DescribesedThe editor is called

while[1 ] Do Clear PSAux |grepXmirror |grep-VgrepMem=0 forDatainch`PSAux |grepxxxx |grep-Vgrep|awk '{print $4}'` DoMem=`Echo$mem + $data |BC ' Done Echo`Date+%f" "%h:%m:%S 'Echomem:{$mem} #if[$mem-GT2 ] if(Echo${MEM}2|awk '! ($1>

Shell Programming BasicsThe shell is a program written in C that is a bridge for users to use Linux. The shell is both a command language and a programming language. A Shell is an application that provides an interface through which users access the

Regular Expressions && text-processing toolLearning Goals:L Mastering the use of regular expressionsL MASTER the use of SED and awk text processing toolsDirectory structure:Regular expression Regular Expressions overviewL Regular Expressions: Use a

Iv. Steps of the experiment 1.Shell basic usage of variables and usage of common symbolsThis section requires writing out the shell commands that implement the requirements , showing(1) Change the main prompt to the user's home directory name(

I. Logical judgments in the shell Format 1:if condition; Then statement; Fia=2if [ $a -ge 2 ];then echo ">=2";fi Format 2:if condition; Then statement; else statement; Fia=1if [ $a -ge 2 ];then echo ">=2";else echo " Format 3:if ...;

Programming Basics:Program: Instruction + dataProgram Programming Style:Program: command-centric, data-serving instructionObject type: Data-centric, instruction serves dataShell Program: Provides the programming capability to interpret the execution.

First, we know that there are several ways we execute the shell.1. Sh/bash uses its built-in command set to execute some commands, such as the followingSH Demo.shbash demo.sh2. Use./or $SHELLPATH/*.sh the way to

One, variable and :- withBin= ' DirName "${bash_source-$0}" ' Bin= ' CD "$bin"; PWD ' default_libexec_dir= "$bin"/.. /libexeclibexec_dir= ' #变量set了, but is null libexec_dir=${libexec_dir:-$DEFAULT _libexec_dir}echo $LIBEXEC _dir　${PARAMETER:-WORD}　${

In order to do cluster testing, 3 tomcat is installed on each machine, each time the project is released, it is necessary to repeatedly knock some commands, check that the Tomcat process has not stopped before restarting Tomcat, and kill the process

We may encounter scenarios in which a program on a Linux server must be timed out on every weekday. So is there a way to implement this function? The answer is yes. We can use shell scripts to simply implement this function.The rationale is simple:

1.export commandThe Linux Export command is used to set or display environment variables.When executing a program in the shell, the shell provides a set of environment variables. Export can add, modify, or delete environment variables for use by

Scenario One: Modify environment variables for Linux serversWith Linux, there is a. bash_profile configuration file under the user root, which is only valid for the current user. Modify the/etc/profile file if it is valid for all usersUse the LS-A

1. Date view modify system time and dateDate-DDisplays the time of the string description-FShow each line of time in the Datefile file-RDisplays the last modified time of the file-RDisplay time in RFC-2822 compatible date format-rfc-2822Display time

After MySQL installation on Linux uninstall is not clean, ping server ping does not pass the ICMP protocol is closed, Ping is using the ICMP protocol. Export is a global variable that all users can log in to use.Introduction to 1.iptables firewall

from Windows to the Linux of the Shell scripting Coding and formatting issuesShell script encoding and formatting issues from Windows to Linux1, abnormal problem: set Ff=unix Startup script in the start times error, such as the execution of