Shell

Upper: Process oriented:Sequential executionSelect execution: If, caseLoop execution: For, while, until One, for statement Format:for variable in list;Statement 1;Statement 2;...DoneExample 1, write a script, add 10 users, and let each user's

If statement formattingIf conditionThenCommandElseCommandFi, don't forget this ending.If statement forgets the end fiThree conditional expressions of Test.sh:line 14:syntax error:unexpected end of Fi if IfCommandThen ifFunctionThenCommand executed

Programmers are lazy, you know. Recently in development, you need to use the server's IP and Mac information. But the server is installed on the Linux system, for the multiple network, in the acquisition of IP generated a lot of problems. The

Logical judgment in the shell Format 1:if condition; Then statement; FI//If the condition is met, then execute the statement[[email protected] shell]# cat if1.sh #!/bin/basha=5if [ $a -gt 3 ]then echo okfi[[email protected] shell]# sh -x if1.sh +

#!/bin/Bashbasepath=$ (CD 'dirname$0`;pwd) Shell_dir="${basepath}/shell"Package_dir="${basepath}/package"#获取参数 whileGetopts"I:"Opt Do Case$optinchi) ipaddr=$OPTARG;; \?) ;; Esac DoneEcho "IP NO:"Echo$ipaddrrpm-IVH $PACKAGE _dir/zabbix-

20.10 for Loop Syntax: for variable name in condition; Do ...; Done ;案例1[[email protected] shell]# cat for.sh#!/bin/bashsum=0for i in `seq 1 100`do sum=$[$sum+$i]doneecho $sum#输出的结果[[email protected] shell]# sh for.sh 5050

The MongoDB data types are as follows: Type corresponding numbers Alias Description Double1 1 Double String 2 String Object 3 Object

a blog distinguishes the state return value in the shell -return-break-continue-exitFirst, The difference and contrast between break, continue, exit, return Condition and loop control and program return value command Knowledge table

(i) SEDSed is a streamlined, non-interactive, streaming editor that enters edit commands and specifies file names on the command line. Then look at the output on the screen.The progressive reading of the file contents is stored in a temporary buffer

The anti-quote bit (') is located above the TAB key of the keyboard, to the left of the 1 key. Note the difference between the single quotation mark (') on the left side of the ENTER key.Plays the role of command substitution in Linux. Command

When the number of TCP connections is very large, the current internal IP, the connection of the external IP is counted[[email protected] account_tcp]# cat account_tcp.sh #!/bin/bash# Statistics the current network connection situation Netstat  -na |

1. expr computes the integer variable valueS= ' Expr 2 + 3 'The arithmetic symbol and the parameter must have the space separate;2. Let command let s= (2+3) echo $s 3, for statement For variable in list

Open After ESXi ssh , the host summary will be prompted with a warning message ;650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/54/41/wKioL1R9Zj_iQDD2AACxLMlbQlw314.jpg "/>The solution is as follows : VSphere Client Log in to

Joined the caravan for some time, see the group inside the big head to check the blog, only to realize that I have not written homework. As the saying goes, the time is to kill the Pig knife!!! Cough, actually want to say, horse brother Video is

[[Email protected]:/etc]# tree/etc/ansible//etc/ansible/├──ansible.cfg├──hosts├──python.yml└──roles└──python_install├──files│└──python-3.6.6. tgz├──tasks│├──copy.yml│├──Install. Yml│└──main.yml└──templates└──python_install.SHDescription: Files:

Sed command Sed only edits the copy of the original file in the buffer and does not change the source file. Therefore, to save the file, you must redirect it to another file. Sed: 1. Sed [Option] 'sed command 'input file 2. Sed [Option]-F sed script

Document directory From Ubuntu Chinese RedHat gnome terminal shortcut Http://huangchao200701.javaeye.com/blog/263002     CommonWin + n switch Background Color StyleAlt + TAB = needless to say.Win + TAB switch if 3D effect is enabledCTRL + ALT +

This is a consulting report on csdn today. I think it is very practical, and I have never paid attention to shell and the potential of graphics before. So I would like to take a note. By Martin Streicher, http://sd.csdn.net/a/20110420/296194.html    

Summary: three methods of executing shell scripts, fork, source and exec, are summarized.  Prerequisites 1. any program we run is a child process generated by the parent process. After the child process is completed, it is returned to the parent

Kafree collection Source: The source cannot be determined for Forum reprinting. Please contact us if you have any copyright questions. 1. Stream Object Component: "Adodb. Stream" There are the following methods: Cancel Method The usage is as