Shell

Statistics the most visited IP1. Tail-n 10000 Xxaccess_log | Cut-d ""-F 1 |sort|uniq-c|sort-rn|head-10 |more2.tail-n 10000 Xx-access_log | awk ' {print '} ' |sort|uniq-c|sort-rn|head-10 | MoreStatistics the most visited URLsTail-n 10000

There are several ways to bash a shell script, assuming that the file name of the shell script we have written is hello.sh and that the file location is in the/data/shell directory and has execute permissions.Method One: Switch to the directory

Sometimes it is necessary to start the project automatically after the start of the CentOS system, when the project is deployed in Tomcat, if the CentOS shutdown after the boot, the project has been stopped, and then need to be a manual to open each

#!/bin/bashecho "Current datetime is:" ' Date 'echo "Hello world!"#使用变量: You can use single or double quotation marksYour_name= "Wang"Echo $your _nameEcho ${your_name}Str= ' Shellstudy 'Echo ${str}#只读变量: Cannot change its valueMyurl=

SSH (Secure Shell) is a set of remote operation of Linux and file upload and download software,Very useful, almost all Linux programmers in a software company will use SSH.Preparatory work:: Http://files.cnblogs.com/hongten/SSHSecureShellClient-3.2.9

Echo-echo command can display a line or variable of text, or enter a string into the file string- E To resolve the escape character "nimenhao\ Nasfdsaf" printing occurs line -N-Carriage does not wrap in detail: Generally in the

pipelines are implemented " The previous standard output is used as the following standard input "Xargs is to achieve " to use standard input as a parameter to a command "Contrast:Ind/sbin-perm +700 |ls-lFind/sbin-perm +700 |xargs ls-lParameters and

Directory Re-recognize variables Function Conditional statements Looping statements 1. Re-identification of variablesThere are 3 types of variables in the Shell: User variables, positional

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859 #!/bin/sh## java envexport JAVA_HOME=/usr/java/jdk1.7.0_79export JRE_HOME=$JAVA_HOME/jre## service name##

1. Set the environment variable histsize so that it can save 10,000 command history.   vim/etc/profile   change histsize=1000 to histsize=10000 2. Why do I set PS1 (ps1= "[\[email protected]\h \w]\$")    display the results to be different from

As mentioned above, the shell is a scripting language, so there must be an interpreter to execute the scripts.The common shell scripting interpreters on Unix/linux include bash, sh, csh, Ksh, and so on, which are used to call them a shell. We often

　　No hurry, step-up, first lay a good foundationThe Spark Shell principle　　First, we clearly locate the few.1, Spark-shell2, Spark-submit3, Spark-class4, Sparksubmit.scala5, Sparkiloop.scalaSource Code of InitializesparkDef Initializespark () {

Use Let, (()), or [] for basic integer operations, using expr and BC for advanced operations, including decimal operations.[Email protected] tmp]# str= [[email protected] tmp]# let str=str+6[email protected] tmp]# let str-=5echo $str11You can also

1. Introduction of the Linux command return valueWhen the shell executes a command, it has a return value that is stored in the shell variable $?. When $? is 0 o'clock, the command execution succeeds; when $ = 1 o'clock, the command execution fails.2

1. Common environment variables variable name description example path finds a collection of paths for all external commands. If you do not have a PATH environment variable, all external

In the Linux system, there are/ETC/PROFILE,/ETC/BASHRC, ~/.BASH_PROFILE,~/BASHRC these four configuration files, these files, will be automatically loaded at some point, that is, a little bit, usually are some aliases, special variables inside. Four

The previous article, I said, windows in order to change the user to its console interface, and then start from Windows Vista, plan to change this situation, so there isThe advent of PowerShell.1. Compatible Shell commandsTo be compatible with

first, the numerical judgmentInt1-eq INT2 INT1 and INT2 two number equal true Int1-ne INT2 INT1 and INT2 two number of true int1-gt INT2 INT1 greater than INT1 for true int1-g e INT2 INT1 greater than or equal to INT2 trueInt1-lt INT2 INT1 Less than

1. Analog Linnux Login Shell#/bin/bashecho-n "Login:" Read nameecho-n "password:" Read passwdif [$name = "CHT"-a $passwd = "abc"];thenecho "The Hos T and password is right! " else echo "Input is error!" Fi2. Compare two number sizes#/bin/bashecho

Create a DS13 server using Windows Power ShellThe Web page is created first:Virtual Cloud Service (ServiceName): Zampdmp-dsVirtual Network (vnetname): az-dmpnetworkTo create a new DS13, the attachment 800G Disk PowerShell command is as