Alibabacloud.com offers a wide variety of articles about linux shell scripting tutorial for beginners, easily find your linux shell scripting tutorial for beginners information here online.
makefile compiled files./configure--prefix=/usr/local/apache--with=/aa/cc--prefix Specify installation directory,--with specify dependent file directory2.make Compiling makefile FilesMake also needs to be installed, yum install Make,makec,makeg3.make InstallMake install copies the compiled files to the directory specified by--prefix, if not specified, is the current directoryLinux related directory file storage content:The bin is stored in a normal program and can be used by all usersBoot stora
-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 $answer in y|y) E Cho echo "fine,continue on ...";; N|n) echo echo "Ok,goodbye" exit;; Esacecho "This is the end of the script" [email protected]:/data#./demo5 does you want to continue [y/n]yfine,continue on]. . This is the end of the script Hidden mode read, the-S optio
Write a script:1. Add 10 users user1 to User10, password with user name, but only if the user does not exist to add;#!/bin/bash# forIinch{1..Ten}; Do if!IDUser$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/$2node.qcow2 >/
spaces. If IFS is null, the parameters is joined without intervening separators.oldifs= "$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
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
If a system administrator spends a lot of time solving problems and doing repetitive work, you should wonder if he is doing the right thing. An efficient system administrator should make a plan to spend as little time as possible on repetitive tasks. So while it looks like he didn't do a lot of work, it's because the shell script helped him do most of the tasks, which is what we're going to explore. What is a
Previous section Review In the previous blog post, I focused on the background of Shell scripting, how to create the first shell script in life, and the shell variables. The next step is to introduce shell programming, mainly around she
addition to Shebang, the # occupies the absolute beginning of the content, is the comment line, the interpreter ignores the contents of such a line;3. The explanation ignores all blank lines in the script;4. Lots of commands and keywords (if,else,then,do,while,for, ... ）Note: Once the shell script runs in the current shell according to Shebang's instructions, an interpreter (child
The Linux Shell Script Foundation has been divided into several parts, where the content of the control process is immediately finished, this is the last part about here document, where the example is a little bit more complex, we slowly analyze this complex Linux shell script. 6. Here documents When you want to pass a
]:~/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
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
" Else echo "$val ^ 2 Fi Str1=xcyhaha if [[$str 1 = = xcy*]] Then echo "str1 = = xcy*, str1 is $str 1" Else echo "STR1! = xcy*, str1 is $str 1" Fi 12.7 Case CommandWith the case command, you don't have to write all the elif statements to keep checking the value of the same variable.The case command takes a list format to examine multiple values for a single variable.Syntax: Note the two semicolons that followCase variable inPattern1 | PATTERN2)
Because some registered user account rules can follow, and usually people's awareness of the poor, the password is relatively simple, the user name of the common password login test, to break the password.For learning purposes only, do not use for illegal use. The code has been partially modified, does not work properly, the test needs to modify the code according to the actual needs, in addition to the password security issues must be enough attention.Design ideas: Intercept HTTP packets
Linux shell Script Basic Learning this part if only look at the theoretical part of the previous, although there are some examples, but not enough system, here will be a concrete example to show you the Linux shell script programming to help you improve the Linux
BKJIA Translation: It feels great when you understand Shell scripts and can write them smoothly whenever needed. In this chapter, we will teach you how to use scripting to perform complex mathematical operations. Let's start with the Fibonacci series. The Fibonacci series, also known as the Golden split series, refers to a series of 0, 1, 1, 2, 3, 5, 8, 13, 21 ......, Each of its items is the sum of the fir
can download the code for this example from here. Example Two: colorful Scripts Linux terminals also support colorful, please see the following script: #!/bin/bashClearEcho-e " #092; #048; 33[1m Hello World"# Bold EffectEcho-e " #092; #048; 33[5m Blink"# Blink effectEcho-e " #092; #048; 33[0m Hello World"# Back to NoramlEcho-e " #092; #048; 33[31m Hello World"# Red ColorEcho-e " #092; #048; 33[32m Hello World"# Green ColorEcho-e " #092; #048; 33[33m
Contact Linux in the sophomore time, then fascinated by the embedded Linux, the computer replaced with Linux system, learning the basic knowledge of Linux, learning Linux commands, learning shell, bubble forum, so slowly the norma
This course includes:"1" C language (1 months)"2" C + + syntax and data structure (1 months))"3" MFC project Development (1 months)"4" Linux project development (1 months)Previous sessions of the video have been uploaded to Baidu Network, please follow the video tutorial in advance to master the progress of the course.VS2015 Series Video tutorials include:"VS2015---0 basic C language Video
#备份数据库 $SQL _cmd-h$sql_host-u$sql_usr-p$sql_pwd $SQL _db> $SQL _dir/$SQL _db.sql # Determine if backup succeeded, print out path successfully if[$?-eq0];then echo "backupmysqlalready Successful. " echo "Backuppath: $SQL _dir" Else echo "backupmysqlfailed." Fi #删除30天以前的备份文件 cd $SQL _dir/. /;find.-mtime+30-execrm-rf{}\; echo "Done" #把脚本加到crontab任务计划里 grep "MySQL" /var/sPool/cron/root>>/dev/null if[$?-ne0];then echo "00 ***/bin/bash/root/shell/mysql.sh
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
