shell scripting books

Summary: Chapter Three discusses the two basic operations that are commonly used when writing shell scripts. The fourth chapter introduces about 30 useful tools for processing text files.Chapter III Find and replaceSummary: This chapter discusses the two basic operations that are commonly used when writing shell scripts: text lookup, text substitution.3.1 Finding textTo remove a specific line of text from t

spaces. If IFS is null, the parameters is joined without intervening separators.oldifs= "$IFS" ifs= "" array= ($result) ifs= "$oldIFS" for I in ${array[@]}; Doecho $idone# Use Facter to get a set of Key-value# Facter output has a newline character, you must replace the newline character with a space# Replace newline characters with spaces to use awk or sed# awk-v rs= "" ' {gsub ("\ n", "");p rint} '# ECHO-E "2 \n1" | Sed ': A; n;$!ba;s/\n//g 'result=$ (facter | awk '/ipaddress/!/ipaddress_lo/{p

#shc是一个专业的加密shell脚本的工具. Its role is to convert the shell script into an executable binary file, which is a good solution to the script contains IP, password and so do not want to open the problem.HTTP://WWW.DATSI.FI.UPM.ES/~FROSAL/SOURCES/SHC's official websitewget http://www.datsi.fi.upm.es/~frosal/sources/shc-3.8.9.tgzTAR-XF shc-3.8.9.tgzCD shc-3.8.9Mkdir-pv/usr/local/man/man1#这步是必须的, because SHC will ins

script requires a user name list file as a parameter2) If no parameters are provided, this script should give a hintUsage:/root/batchusers, exit and return the corresponding value3) If a nonexistent file is provided, this script should give aShow Input file not found, exit and return the corresponding value4) New User login Shell is/bin/false, no need to set password5) User list test file:Http://classroom/pub/materials/userlist# wgethttp://classroom/

Common shell scripting use cases, from the online reference and after the modification of the work, in addition to the wiki in the company to write records, it is necessary for a blog to record a drop.Combat Problem 1:Use the For loop to create a batch of 10 files in the/oldboy directory, with the name in turn:Oldboy-1Oldboy-2......Oldboy-10Answer:[[Email protected]]# cat 1.sh#!/bin/bashFor iin ' seq 1 10 '

use it as the first command option. The FS parameter immediately following the-F option is a regular expression or is provided as the next argument. The field separator character can also be set to be specified using the built-in variable FS. Such as:Awk-f ' \ t ' {...} ' files fs= ' [\f\v] ' filesAbove example the value set by the-F option is applied to the first filegroup, and the value specified by FS is applied to the second group. The-v option initialized must be placed before any programs

file not found and then exit and return the corresponding value4. Created user login shell for/bin/false5. This script does not need to set a password for the user6. You can get the user name list as a test Http://rhgls from the URL below. Domain11.example.com/materials/userlistVim mkusers.sh#! /bin/bashIf [$#-eq 0];thenEcho ' Usage:/root/mkusers 'Exit 1Fiif [!-F $]; ThenEcho ' Input file not found 'Exit 2FiWhile Read lineDoUseradd-s/bin/false $lineD

, This command keeps the command that is about to jump to another shell terminal to continue running in this terminal.The end of the logo is EOFThe two empty lines in the middle represent the carriage return, the default meaning.1 umount/dev/mmcblk1p1 2 /dev/ mmcblk1p13 umount/ dev/mmcblk1p2

; "src=" Http://s3.51cto.com/wyfs02/M01/6D/71/wKioL1VkgxWDcoX1AAFFm2II9Jg092.jpg "title=" Iiii.png "alt=" Wkiol1vkgxwdcox1aaffm2ii9jg092.jpg "/>2 Restarting the DHCP serviceService DHCPD Restart650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/6D/71/wKioL1Vkg-nSFvTyAACA2JR08T8552.jpg "title=" yy.png "alt=" Wkiol1vkg-nsfvtyaaca2jr08t8552.jpg "/>3 Authenticating the ClientService Network restart650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/6D/75/wKiom1VkgtmwUhKTAAJ5iQ_rdLg175

There are some files and directories under the current directory, each of which has several. txt files in each directory.It is now required to create a new directory in the current directory all, and all of those directories will have a. txt fileare copied to the directory all. The shell script in ubuntu12.04 is implemented as follows:#!/bin/sh# Hint Informationecho "Start:"# define VariablesDst=allPst=.txt# Copy files to destination folderIf [-D ${DS

A problem was encountered today when writing a timed CP script, value too great for base (Error token is "08")The number system that originally started with 0 is recognized by default as an octal number, so my $datem-1 gets the month of the month in return: value too great for base (Error token is "08") This error, the solution isThe $datem format or the declaration is called decimal, ' 10# $datem '-1 so it can. That is, the variable or number that will be converted to decimal is preceded by a '

-i ' $myline ' s/$/\a\nupstream fdfs_group1 {\ n server ' $tempvar ': 8080;/'/root/my/mybin/sbin/test.configSed ' 3a 123 ' 1.txtSed-i ' $myline ' a\nupstream fdfs_group1 {\ n server ' $tempvar ': 8080; '/root/my/mybin/sbin/test.configFive, the operation of the variableThe operation should be placed in square bracketsKnown variable myline, the variable plus 2 should be written as: $[myline+2]Vi. Replace the value of a string that appears several timesUnlimited:Sed-e ': a;/\ (. *abc\) \{3\}/{s/abc

Simple needs to explain shell+expectInstall the Expect,yum installation firstYum Install Expect-y#!/bin/baship= ' 192.168.80.20 ' #定义远程交换服务器的IPpassword= ' [email protected] ' #定义输入的密码Expect Spawn ssh [email protected] $ip ls #在expect中执行命令Set Timeout-1 #定义超时时间, 1 is never timed outExpect "*:" #如果输出 *:Set Timeout-1Send "$password \ r" #自动输入passwordExpect EOF #结束EofThis article is from the "Eight Miles" blog, so be sure to keep this source http://5921271

;NBSP;STATU=0NBsp;| |statu=1if[ "$statu" == "0" ];then echo $filename exists and is a directory. "rm -rf "$path/$filename" echo "deleted this directory! "else echo "$filename exists and is a file, deleting and creating a directory with the same name " rm-f "$path/$filename" mkdir "$path/$filename" echo "Creating now Please ..." echo "$filename Catalogue has been established! "fi ;; esacFor simple instructions, write the logic of the script. Use the TEST-E command to determine if the "log

original content). The final result is consistent with the results we see. 2. Transformation of Ranks Let me explain the above statement, h means that the content of the pattern space is appended to the hold space, ${...} means the last execution, which means that the contents of {} are executed last, so the contents of the space are consistent with the contents of cat in the last time,x Represents the content of the swap hold space and pattern space , then the contents of the patte

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 well as administrator account root. The rest is for general user accounts.Each line is composed of (to: Split):1 account name;2 password (combined with/etc/shadow);3 UID User ID, where 0 is the root, 1~499 is the system user account, and the general u

/local/mysql/--datadir=/usr/local/mysql/data/--user=mysql ls/usr/ Local/mysql/data/ln-s/usr/local/mysql/bin/*/bin/service mysqld start echo "Now let ' s begin mysql_secure_installation "If [! -e/usr/bin/expect] then yum install expect-y fi echo ' #!/usr/bin/expect set timeout set password [lindex $argv 0 ] Spawn mysql_secure_installation Expect {"Enter for none" {send "\ r"; exp_continue} "y/n" {send "y\r"; Exp_continue} "Password" {send "$password \ r"; Exp_continue} "cleaning up" {send "\ r"}

2017 09:48:22 +0800from localhost [127.0.0.1]-----The following addresses had permanent fatal errors-----[email protected]>(reason:550 Failed to connect remote host.)-----Transcript of Session follows-----... while talking to mx3.qq.com.:... while talking to mx2.qq.com.:So the machine was restarted a bit. You can do it.[Email protected]:/var/mail$ Echo]20171204tete" | Mail-s "TEst2"Xcy[Email protected]:/var/mail$ Mail"/var/mail/xcy": 3 messages 1 new 2 unreadU 1 Mail Delivery Subs December 4 10

Tags: $* operation definition test ifconfig dir rhel Zha preShell languageScript: Can run, a file, can implement some function (command stacking)[Email protected] ~]# vim/root/stu.shecho Hello WorldCat/etc/redhat-releaseUname-rHostnameIfconfig | Head-2[Email protected] ~]# chmod +x/root/stu.sh[Email protected] ~]#/root/stu.shCase 1: Writing a script to create a user[Email protected] ~]# vim/root/user.shUseradd nsd02Echo 123 | passwd--stdin nsd02[Email protected] ~]# chmod +x/root/user.sh[Email p

In order to make the shell script have a certain "judgment" ability, according to different conditions to accomplish different management tasks. Make the script a certain "smart".First, condition test operationFile Test Common operations:-D:: Test for Directory-E: Test whether the directory or file exists-F: Test for file-R: Tests whether the current user has permission to read-W: Tests whether the current user has permission to write-X: Test to set p