linux scripting books

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Write a script:1. Add 10 users user1 to User10, password with user name, but only if the user does not exist to add;#!/bin/bash# forIinch{1..Ten}; Do if!IDUser$i >/dev/NULL; ThenUseradd user$iEcho "user$i"|passwd--stdin user$iElse Echo "User$i exists" fi DoneDelete the above 10 users#!/bin/bash# forIinch{1..Ten}; Do if IDUser$i >/dev/NULL; ThenUserdel-r user$i >/dev/nullEcho "user$i deleted" Else Echo "user$i NOT EXISTS" fi DoneExtension: Adds or deletes a specif

) # #开启虚拟机echo Start VM ...Virsh Start $ >/dev/nullEcho Start VM $ successful!!!;;View) # #显示虚拟机Echo View VM ...Virt-viewer $ >/dev/nullEcho View VM $ successful!!!;;Stop) # #关闭/Stop virtual machineecho Stop VM ...Virsh Destroy $ >/dev/nullEcho VM $ is stopped!!!;;Reset) # #重置虚拟机echo Reset VM ...Virsh Destroy $ >/dev/nullVirsh Undefine $ >/dev/nullRm-fr/var/lib/libvirt/images/$2node.qcow2 # #删除原磁盘快照文件Qemu-img create-f qcow2-b/var/lib/libvirt/images/$2.qcow2/var/lib/libvirt/images/$2node.qcow2 >/

file Content:bin:x:2:2:bin:/bin:/usr/sbin/nologin　　The done command is useful for looping the results of a loop to another command, redirecting to a file or screen, and using other commands to display to the screen[Email protected]:/data# cat Demo7 #!/bin/bashfor State in ' North Dakota ' Connecticut Illnois Alabama Tennesseedo Echo "$state is the next place to go" done | Sort > Textecho "This completes we travels" [email protected]:/data#./demo7 This completes our travels[email protecte

Linux under Bash programming combination test and write comprehensive script (v)1.Bash Programming Combination test conditions-A: With relation-O: or relationship!: Non-relationalPresentation Method 1:[$#-gt 100-a $#-le 500]Presentation method 2:[$#-gt] [$#-le 500]2. Write a script that adds and deletes users as follows:2.1: If the script option is--add:, the user will be added; If the option is--del, the user will be removed, if it is--help display

specified shell command V Start the VI editor with the current file . Repeat the previous command N Find in file the overflow matches the content of the specified expression ‘ Jumps to the first content that the specified expression matches to Ctrl+l Redraw the current screen View Som

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

future in the source directory to operate the Arch/arm directory. The cross_compile is used to specify the path and prefix of the cross-compilation toolchain.(7) Cross_compile = xxx and arch = xxx and o=xxx These can be passed to the top-level makefile by command-line arguments at make.So sometimes you see someone compiling the kernel: Make O=/tmp/mykernel arch=arm cross_compile=/usr/local/arm/arm-2009q3/bin/ arm-none-linux-gnueabi-2: Link Script ana

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

1. Linux Scripting Basics1.1 Basic Introduction to grammar1.1.1 StartThe program must start with the following line (must be placed on the first line of the file):#!/bin/shThe symbolic #! is used to tell the system that the parameters behind it are the programs used to execute the file. In this example we use/BIN/SH to execute the program.When you edit a good script, you must also make it executable if you

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: = = Memory Pos = = = Cal Linux Ota bin percent#!/bin/shHostname= ' Hostname-s 'echo "==============hostname================"echo "Hostname= $HOSTNAME"Memoryline= ' Free | grep Mem '#字符串转数组Memoryarr= ($MEMORYLINE)echo "==============memory=================="TOTAL=${MEMORYARR[1]}USED=${MEMORYARR[2]}echo "total = $total"echo "used = $used"#计算百分比Used_pre= ' echo ' scale=2; $used *100/$total "| BC 'echo "Used_pre = $used _pre"%FREE=${MEMORYARR[3]}ech

. Useful Scenario 2:now there are 1000 boards shipped to be labeled, and the MAC address was not recorded for some reason. This time how to do, it is not possible to go to the landing copy and paste. Save it to the printer, a script print out, it's so wayward SSH login execute ls command :echo y| plink-ssh [email protected]-PW password lsSSH Login Run command.txt command in turn:echo y| plink-ssh [email protected]-PW password-m command.txttelnet Login to execute ifconfig and exit:? Echo ' ifcon

$name >/dev/nullif [$?-eq0];thenstr= "user${name}isdeletesuccessfully!!!" echo-e "\033[30;47m$str\033[0m" elsestr= "user${name}isdeletefailly!!!" echo-e "\033[31;47m$str\033[0m" fi ;; 5) str= ' df-th ' echo-e "\033[30;47m$str\033[0m";; 6) str= ' free -m ' echo-e "\033[30;47m$str\033[0m" ;; 7) clearmenu;; 8) echo-e "\e[31mlogout...\e[0m" sleep1break;; NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;9) echo-e "\e[31mquitsuccessfully!!! \e[0m " exit;; *) str= "I

]:~/learn$ cat Args.txt | Xargs SH cecho.sh;Arg1 arg2 arg3#Requirement 3, how do I embed parameters in a fixed command line? As shown below:Copy CodeThe code is as follows:[Email protected]:~/learn$ sh cecho.sh-p args1-1-P args1-1#[Email protected]:~/learn$ sh cecho.sh-p args2-1-P args2-1#[Email protected]sli-pc:~/learn$ sh cecho.sh-p args3-1-P args3-1#Solutions for using Xargs:Copy CodeThe code is as follows:[Email protected]:~/learn$ cat Args.txt | xargs-i {} sh cecho.sh-p {}-1-P arg1-1#-P arg

'; 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; -

updated successfully.Changing password for user bruce03.Passwd:all authentication tokens updated successfully.Changing password for user bruce04.Passwd:all authentication tokens updated successfully.Changing password for user bruce05.Passwd:all authentication tokens updated successfully.Changing password for user bruce06.Passwd:all authentication tokens updated successfully.Changing password for user bruce07.Passwd:all authentication tokens updated successfully.Changing password for user bruce0

-nand 11 use, tell read command to accept single word specifier exitCode 2-25[Email protected]:/data# cat Demo5 #!/bin/bashread-n1-p "Do you want to continue [y/n]" Answercase $answer in y|y) E Cho echo "fine,continue on ...";; N|n) echo echo "Ok,goodbye" exit;; Esacecho "This is the end of the script" [email protected]:/data#./demo5 does you want to continue [y/n]yfine,continue on]. . This is the end of the script　　Hidden mode read, the-S optio

used with variable names, and if the loop body does not include a variable name, a dead loop may occurHow the list is generated:1) Give a direct2) List of pure integersSEQ: Output An integer listseq [First [INCREMENT]] Last3) curly braces unfold{first.. Last}4) return value of the execution result of the command5) GLOBBING6) references to certain variables: [email protected], $*Features of the For loop:1. There is almost no cycle of death;2. The entire list needs to be loaded into memory during

#description:galaxycd/varfori in$ (Ls/var);doif[-f $i ];then echo "Commonfile." elif[-L $i ];thenecho "Symbolicfile ." elif[-d $i ];thenecho "DirectOry. " elseecho "Othertype" fidone method three:#!/bin/bash# version:0.0.8#author:lcc.org#description:adddirforiin$ ( Ls/var) doif[-f/var/$i ];thenecho "Commonfile" elif[ -l/var/$i ];thenecho "Symbolicfile" elif[-d/var/$i ]; thenecho "Directory" elseecho "Othertype" FidoneExample four: How many listen are in the establish State under the TCP protocol