how to write bash script

result of the execution state result is not 0.Single-Branch condition judgmentIf condition, then the execution status result of the condition is 0 end or if condition then the execution status result of the condition is 0 end2 Branch condition judgementIf condition, then the execution status result of the condition is 0 otherwise the execution state result of the condition is not 0 end or if condition then the execution state result of the condition is 0 otherwise the execution state result of

Up (BASH script Programming copy system library file )To re-edit grub as silent mode:1.vim/mnt/boot/grub/grub.confDefault=0Timeout=3Title Nick Linux (2.6.18)Kernel/vmlinuz ro root/dev/hda2 QuietInitrd/initrd.gzHow to implement terminal prompt information:2. Copy the host file:cp/etc/issue/mnt/sysroot/etc/3. Re-edit issue information:Vim/mnt/sysroot/etc/issueNick release 5.9 (Final)Kernel \ r on an \mHttp://

the following several casesValue 1) This is not the condition, but the value of the variable, the first value of the variableExpression...;;( None of the options can end with a double semicolon)Value 2)-the second typeExpression...;;...*)Expression...EsacValue can have more than oneExercise: Write a script that asksLet the user type the content from the keyboard and then use our

Script execution:The script starts a child shell process when it executes. Scripts that are started on the command line inherit the current shell environment variables, and the system-initiated scripts (not command-line launches) require a self-defined amount environment variable.Program Status Return code:0: Execute correctly.1-255: Error execution, 1, 2, 127 system reserved.Exit Role Exits

#!/bin/bash################################################################################# Filename:upgrade_ Project.SH# Summary: Project Upgrade Script # LICENSE:GPL # Version:1.0# Author:jet bi# Email:1207501666@qq. com# Date: ./ ,/ ,# Note: #1requires project support for SVN upgrade mode and is equipped with svn#2need restart_tomcat.sh to exist #3. Use description # Upgrade:./upgrade_project.SH-P Proje

ArticleDirectory Bash script file: export_db.sh Bash script file: export_db.sh #! /Bin/sh # Export_db.sh# Exporting database modes and Data# Codingstandards@gmail.com# V1: 2010-05-23# V2: 2011-10-08/09 # Command instructions# Read Database Name and table name from standard input# Usage: export_db.sh#

Because of the recently written node. JS program Because of some bugs, there will be some automatic exit problems, so it needs to be found in time when it exits, and restartSo looked up some information, wrote a bash program, the function is very simple, is every 3s to determine whether the node program at 6000 port is running, if not found 6000 port, then the command to execute the startup program, has been used for a period of time, feel good, simpl

. $ {Varname % pattern} If the pattern matches the end of the variable value, delete the shortest matching part and return the remaining part. $ {Varname % pattern} If the pattern matches the end of the variable value, delete the longest matching part and return the remaining part. $ {Varname/pattern/string} Replace the first part that matches pattern with string $ {Varname // pattern/string} Replace all matching parts of pattern with string

Today, there is a very strange problem, the shell script that has been running very normal failed, but yesterday added a parameter.Error message:/bin/bash^m:bad interpreter:no such file or directoryLater found that root cause, modified the file yesterday in Windows modified save, and then uploaded. The file is recognized as a DOS format.Use the following command in this command mode to view:: Set FFreturn R

Settings for Bash script parametersSelect parameter Add|del Add Delete user1-user10#! /bin/bashIf [$#-lt 1];thenecho "Usage:adminusers ARG"Exit 5Fiif [= = '--add '];thenFor I in {1..10};d oIf ID user$i >/dev/null;thenecho "user$i exists."ElseUseradd-r user$iecho user$i |passwd--stdin user$i >/dev/nullecho "ADD Uesr$i finished."FiDoneelif [= = '--del '];thenFor I in {1..10};d oif! ID user$i >/dev/null;thenec

DescriptionCurrently, PowerShell under Linux is approximately equal to pash. I hope you focus on mono, focus on pash.One-click installation script includes for Centos6,centos7,ubuntu 14.04 Ubuntu 14.10Installation script is installed with Yum or APT, mono official latest version, then compile and install the latest version of Pash, and finally generate two commands:Mybuild for compiling pashMypash for runni

Inspired by the oneStack script: It turns out that the script can be executed with a certain user permission easily. The script content is as follows: #! /Bin/bash # filename: test. sh # email: wangxiaoyu@Live.com # date: 2013-09-02user = "root" if ['whoam '! = "$ {User}"]; then exec su-"$ {user}"-c "sh $ {PWD}/test

This is the automatic deployment of the standalone version. For manual deployment, refer to my other article: Http://blog.csdn.net/sheismylife/article/details/6737127 First download the mongodb-linux-x86_64-2.2.0.tgz, decompress it and put it under the project directory MongoDB. Then prepare the startup script MongoDB: #!/bin/sh ### BEGIN INIT INFO# Provides: mongodb# Required-Start:# Required-Stop:# Default-Start: 2 3 4 5# Default-Stop:

#!/bin/bash#fdisk-l | grep "^disk/dev/[sh]d[a-z" | awk ' {print $} ' | Sed "[emailprotected]:@@g" Read-p "Your choice Partdisk above:" partdiskif [$PARTDISK = = Quit];then echo "quit. ." Exit 0fiuntil Fdisk-l | Grep-o "^disk/dev/[sh]d[a-z]" | grep "^disk ${partdisk}$" >/dev/null;d o read-p "wrong choice Your Choice again:" Partdiskdone read-p "would des Troy all data continue[y/n]: "choiceuntil [$CHOICE = =" Y "-o $CHOICE = =" n "];d o read-p" would

Question: If a user is opening several bash interfaces at the same time, which Bash's history command record will be written in ~/.bash_history?A: All bash has its own histsize pen recorded in memory, because the log file will not be updated until the logoff, so the last bash will be last written, and the other bash co

#! /Bin/bash# Call this script with at least 10 parameters, for example#./Scriptname 1 2 3 4 5 6 7 8 9 10 Minparams = 10 Echo Echo "the name of this script is \" $0 \"."Echo "the name of this script is \" 'basename $0 '\"." Echo If [-n "$1"]#-N test string be quoted is not null.ThenEcho "parameter #1 is $1" # Need quot