Shell

Under Linux, if the shell command you want to execute takes a very long time, and: (1) Your network is unstable, you may be disconnected at any time, or (2) you must close the terminal software (for example, SECURECRT) after executing the shell

Regular expressions^ Start tag$ end Tag[A-z][A-z][0-9]. Single arbitrary character* Number of previous character repetitions >=0+ Number of previous character repetitions >=1？ Number of previous character repetitions 0 or 1{N,m} The number of times

1, first use the sudo apt-get install dconf-editor command installation Dconf-editor, the default is not installed;2, after the installation is complete, run the Dconf-editor command to call out the window, press org->gnome->nautilus->preferences

Shell to determine user parameters Conditional test statements are able to test the characteristics of an expression that is trueThe return value is 0 when the condition is setOtherwise, return other valuesTo test the statement format:[ conditional

Special variables ($, $, $, $, $#, [email protected], $*)There are some special variables that can be used in shell programming. These variables can be used as global variables in the script. Name Description $

Preface or Today write a self-starter packaging script. Used to get the last file name from the path name. Here is a record of the implementation process.Of course, in the end I will also give the official approach. (PS: Very embarrassing, realized

categories of variables:1. System Variable env2. Custom variable set> env Environment VariablesSystem Environment Variables/etc/profile/ETC/BASHRC Personal Environment Variables. Bash_profile. BASHRC. Bash_history. Bash_logout  Positional variables$$

Pipe character Fg Bg Sleep Variable Set Defining variables Variable classification Cancel a variable environment variable configuration file Pipe character管道命令操作符是：”|”,它仅能处理经由前面一个指令传出的正确输出信息，也就是

Compressed packagingCommon Compressed FilesWindows:rar, Zip, 7zLinux:.zip,. GZ,. bz2,. XZ,. Tar,. GZ,. tar.bz2,. Tar.xzGzip Compression ToolIt compresses directly behind the file name and canCommand: The meaning of gzip-d decompressionCommand

The definition format of the function:function Funname (){Actionreturn xxx;}1, can be with function fun () definition, can also be directly fun () definition, without any parameters2, the parameter returns, can display add: return returns, if not

The TR command is used to replace the contents of the standard input. For example# echo ' HELLO World!!! ' | TR "A-Z" "A-Z"Hello World!!!Here the "A-Z", "A-Z" all represent the collection, the shell script defines the collection type is very simple,

************************************************************************* * * * Original:blog.csdn.net/clark_xu Xu Changliang's Column************************************************************************? time to read the file#!/bin/bashFor file

[-A file] is true if file exists.[-B file] True if file exists and is a block special file.[-C file] True if file exists and is a word special.[-D file] True if file exists and is a directory.[-E File] True if file exists.[-F file] True if file

Tag: One put BSP compresses rect permissions. GZ mnt gzip8th: Shell script Archiving and compressionRegular backups are not trivial, and we can automate backup through shell scripting. Where data backup is generally used to archive and compression,

HDFS File Operations Command[ email protected] sbin]$ Hadoop fsusage:hadoop fs [generic options] [-appendtofile ... ] [-cat [-IGNORECRC] ...] [-checksum ...] [-CHGRP [-R] GROUP PATH ...] [-chmod [-R] PATH ...] [-chown [-R] [Owner][:[group]]

Have you ever felt that it's hard to write a long, absolute path when executing a script, to make it easy and easy to write your own script and start your footsteps as if you started Apache. (PS: Actually Apache is also a script)First, to understand

In the Hadoop, zookeeper, hbase, spark cluster environment has set up the environment, 工欲善其事 its prerequisite, now the device has been, the next is to open up, first from Spark-shell began to uncover spark artifact veil.Spark-shell is the command

Because my normal working environment is Linux, so inevitably use command line mode and shell script, and some command line every day to lose many times, such as SSH login, so simply put the usual commands are written script files, so deliberately

What is a shell script?Plain Text Document --the data stored in the document is stored in a character unit;a large number of command combinations to solve user problems according to user's needs;"Power of Execution"-the result of the multiple

#!/bin/sh#please user the full Path DirectorySitename= "Www.sijisiji.com"prefix= ' Date +%y%m%d 'Cur_bak_name=${sitename} "_" ${prefix} "_bak"Cur_bak_name_gz=${cur_bak_name} ". tar.gz"Backupdir= "/home/backup"Sitedir= "/home/wwwroot"if [!-f