best bash scripting book

When assigning a value of "=" to a script variable, "=" cannot have spaces left or right, otherwise it will prompt an error.For example, the following examples: #!/bin/bashbegin_time = ' date +%h: %m:%s ". /a.outend_time = ' date +%h:%m:%s ' echo ' " echo " $BEGIN _time " echo " " echo " $END _time When the system time is assigned to Begin_time and Eng_time, in accordance with the previous habit, "=" Left and right to add a space, resulting in an error message:[email pro

'; DoIf ID $DUSER >/dev/null; ThenUserdel-r $DUSER[$DEBUG-eq 1] echo "Delete $DUSER finished."Else[$DEBUG-eq 1] echo "$DUSER not exists."FiDoneFiecho "$DEBUG add: $ADD del: $DEL"[Email protected] ~]#/adminuser33.sh-v--add tom2,tom3--del tom2ADD user Tom2 finished.ADD user Tom3 finished.Delete Tom2 finished.1 add:1 del:1Exercise: Write a script showlogged.sh , which is in the following format:Showlogged.sh-v-c-h|--helpamong them, - H option can only be used alone to display help information; -

Transferred from: http://blog.csdn.net/csfreebird/article/details/7978699' symbol contains commands that can be saved to a variable after the command has been executed #!/bin/Bash v= ' java-version ' echo $v Execution Result: $./install.sh "1.6.0_34" 1.6. 0_34- B04) 20.9', English is Backtick, accent.There is another way to wrap the commands in $ (). #!/bin/Bash

Scripting of Bash functions under Linux (11)1. Function of script programming:Function: Structured programming, cannot run independently, needs to be executed when called, can be invoked multiple timesFormat 1:Function name {Statement...}Format 2:Function name () {Statement...}2. Call function Execution status return value:Format: return value, value between 0-2553. Use the function to complete the script t

# this are to show what you are to execute a series of commands in one strike.$ clear; CD/; Ls-l; echo "You is in $PWD"; echo "Time to go home"; CD ~;# Use semi colon between command.# There is also command lists, which are for a different logic# # Double ampersand means anding, double pipe means ORING; When using if only when the first command exits 0 (successful), the later command would be proceeded; When using | |, if the first command exits none of zero (not successful), the later command

'-back close or reverse closeShift +tilder? Command ExpansionCat > Lspath.txt/etc^cLs-l ' Cat lspath.txt ' | grep. conf > Etcconf.fileORLs-l $ (cat lspath.txt)Another example using "Du" command:Du-h ' Cat lspath.txt 'Set | grep EtcdirEtcdir= ' ls-l/etc 'Echo $ETCDIR # to reserve the normal format with use echo "$ETCDIR"Netstat-ant | grep 443# # # Checking HTTPS status, if result is 1, it is running; If result is 0, the HTTPS service is dead###Ssl_status= ' Netstat-ant | grep 443 | Wc-l 'Echo $ss

Write a second shell script today and write the after-class questions in "private cuisine". The problem needs to write a check whether a name exists, does not exist to create a file, there is a need to determine whether the name of the file, the file is deleted after the creation of a directory with the same name, if the directory is to delete this directory.First set up a basic condition: The Operation directory is/tmp/test/(note: If this directory does not exist you need to create manually), y

contains the information and location of the source file. Referencing a hard-link file is equivalent to referencing a source fileCp-l test1 test4The-l parameter creates a hard-link test4 that points to the file test1.Note: You can only create hard links between files on the same storage media, and you cannot create hard links between files under different mount points.The parameter-s creates a symbolic link, or a soft connectionCp-s Test TEST5When copying a linked file, be aware that if you use

Bash scripting one variable, variable typeShell Programming:Compilers, interpretersProgramming languages: Machine language, assembly language, advanced languagesStatic language: Compiled languageStrongly typed (variable) languageconvert into executable format in advanceC,C + +,JAVA,C #Dynamic Language: interpreted language On the fiy Weak typeEdge interpretation Side ExecutionASP,asp, PHP, Shell,Python,Pe

51200083 linuxpartition1doesnotendoncylinderboundary./dev/sda2 64 128131024000008eLinuxLVM/dev/sda3 1281314118 1048981183Linux/dev/sda4 1411915665 12426277+5Extended/dev/sda5 141191542410490413+ NBSP;NBSP;82NBSP;NBSP;LINUXNBSP;SWAPNBSP;/NBSP;SOLARIS2, error path [[emailprotected]scripts]# ./test.shenteradiskNbsp;specialfile:hownosuchfile. [[emailprotected]scripts]#echo$?1[[emailprotected]scripts]#This article is from the "Reading" blog, make sure to keep this source http://sonlich.blog.51cto.co

Scripting for the special use of the while statement under the Linux Bash Program (10)1. Loop control:Break: Interrupts the entire loop statement, which is the statement following the execution of the script after exiting the loopContinue: Interrupt the current cycle, advance to the next round cycleExit: End Script Run2.while dead Loop, that is, when you do not know how many times the loopFormat: while:; Do

Linux Bash programming case statements and scripting (eight)1.case statement in the following format:Case variable inValue 1)Statement 1...;; Each branch statement ends with a semicolonValue 2)Statement 2...;;*) Other, equivalent if statement elseStatement 3...;;ESAC the entire case statement ends2 . Write a script that adds and deletes the user arbitrarily, with the following requirements:2.1: If the scrip

Bash shell scripting Getting Started (ii)Use of the Read commandRole:Use read to assign the input value to one or more shell variables:-p Specifies the prompt to display-T TIMEOUTRead reads the values from the standard input, assigns a variable to each word, and all the remaining words are assigned to the last variableEx.read-p "Enter a filename:" FILE650) this.width=650; "src=" Http://s1.51cto.com/wyfs02/M

Scripting for Bash programming until statements and formatted hard disk partitions in Linux (10)1. Summary of circular statement structure1.1.while Statement Enter the Loop statement when the condition is metWhile condition; DoStatementDone1.2.until Statement Enter the Loop statement when the condition is not satisfieduntil conditions; DoStatementDone1.3.for variable in list; DoLoop bodyDone1.4.for ((expres

Multiple SQL injection and cross-site scripting vulnerabilities in PHP Address Book Release date:Updated on: Affected Systems:PHP Address BookDescription:Bugtraq id: 71862 PHP Address Book is a Web-based Address Book. PHP Address Book has multiple SQL injection and Cross-Sit

1. lnoi.sh: Lists the number of connections per IP under the current system:# Cat Lnoi.sh#!/bin/bash# use for list connect numbers and IP address.netstat-n |grep ' ^tcp ' |Grep-v ' 127.0.0.1 ' |awk ' {print $} ' |Cut-d:-f1 |Sort |uniq-c |Sort-rn | awk ' begin{printf '%-10s%s\n "," Connum "," IP "}{printf"%-11s%s\n ", $1,$2} '2. lu.sh: List uid>=500 and!=65534 's account:# Cat Lu.sh#!/bin/bash# use for list