Shell

#!/bin/bashPath=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbinExport PATH#数据库用户名Dbuser= ' Root '#数据库用密码dbpasswd= ' Password '#需要备份的数据库, multiple databases are separated by spacesDbname= (' dbname1 ' dbname2 ' dbname3 ' dbname4 ' dbname5

1.1. usage of the Cut command in the shellThe first usage is similar to awk, as shown in awk below :Cat/etc/passwd|awk-f: ' {print $1,$5} 'Cut-d: The colon after-F 1,5/etc/passwd/-d indicates the delimiter between the fields, and-f indicates which

The shell script, as its name implies, is a script written for the shell, as long as there is a text editor and an interpreter that can execute the script.There are many types of Shell in Linux, we can open a text editor (can use the Vi/vim command

Used to automate some of the front-end publishing operations.Script:# Webreleasepath is used to publish the directory, Webrevisionpath is the development of the directory

One, variableA variable is a container in which different values can be placed.Key facts:Path,home,pwd,logname these are variables.Example:[[email protected] ~]# echo +ba+~]# echo $a +$b3+4~~ ]# echo $a 3$b4~]# echo $a"3"$b334 The summation of

Use the conditional function if to compose a shell function called F_judge, which implements the following functions1) when the/home/log directory exists, move the files or directories that start with all TMP in the/home directory to the/home/log

Linux--Shell programming one, regular expression 1, regular expression PK wildcard　　　　　　　　2.Basic Regular Expressions1),*The previous character matches 0 or more times~ grep "A *" Test_rule.txt # matches all content, including blank lines~ grep "aa*"

^ matches only the beginning of the line$ matches end of line only* A single character immediately after the *, matching 0 or more of this single characters, it can also be a sequence. You can use-to represent a range of character sequences within []

First, condition testThe command test or [can test whether a condition is true, if the test result is real, the exit status of the command is 0, if the test result is false, the exit status of the command is 1 (note the exact opposite of the logical

#!/bin/bash#20170905 input parameter formatecho "displays" Backup Files "Date_0=$1date_1= ' expr $date _0 + 1 'date_2= ' expr $date _0 + 2 '#定义时间段touch-d $date _0/tmp/tm-0.file #开始时间touch-d $date _1/tmp/tm-1.file #结束时间1touch-d $date _2/tmp/tm-2.file

ll command to view file informationThe first root represents the creator of the file, and the 2nd root represents the group root that the file belongs toRWX delegate Rights R (read) permission, W (write) write permission, x Execute permission,

Delete the first line in the file file1 to the line containing word characters and redirect to the file File2:Sed ' 1,/word/d ' file1 > File2Keep the lines in the file file1 that contain word characters and redirect to the file File2,-n to indicate

There is demand, can let oneself lazy is the real motive force of study. Because the test environment always needs to manually modify the configuration file after building the code, the learning side completes a shell script that can be modified

1. View Memory usageFree-m2. View drive Information usageFdisk-l3. View CPU and Memory usageTop4. View CPU Information commandsCat/proc/cpuinfo5. View memory InformationCat/proc/meminfo6. Modify the IP

1, Shell Equality comparison note-eq Comparison of numbers equal= = Comparison of string equality2, = = and the difference= = can be used to determine if a variable is equal, = In addition to being used to determine whether a variable is equal, it

#!/bin/bash# #User  : mobanche#date : 2017-7-17#work : delete user########### ####################################          define  function         ############################################### function get_answer {#unset  ANSWERASK_COUNT=0#while 

$* all positional parameters, being used as a wordNote: "$*" must be referenced by ""[email protected] is synonymous with $*, but each parameter is a separate "" reference string, which means that the parameters are passed completely, are not

Save a copy of the template, then use it for simple parameter processing#!/bin/Bash whilegetopts h:ms option #选项后面的冒号表示该选项需要参数 Do Case "$option" inchh)Echo "option:h, Value $OPTARG"#参数存在 the $optargEcho "Next arg index: $OPTIND";; m)Echo "option:

Octal (020) →10[[email protected] yemo]# echo $ ((num=020)) 16[[email protected] yemo]# echo $ ((num=8#20)) 16Hex (0xff) →10[[email protected] yemo]# echo $ ((NUM=0XFF)) 255[[email protected] yemo]# echo $ ((NUM=16#FF)) 255[[email protected] yemo]#

In Lua, Os.execute can execute DOS commands, but returns the system status code, which is the default output.Io.popen () can also execute DOS commands, but returns a file. egCopy the Code code as follows:Local T = Io.popen (' svn help ')Local A =