Shell

#!/bSTART=$(Date+%s);d Atebegin=`Date-D" $" "+%y%m%d"' DateEnd=`Date-D" $" "+%y%m%d"' Sdate=`Date-D"$datebegin-1 days" "+%y%m%d"` while["$datebegin"-le"$dateend" ] DoEcho$datebegin/usr/local/hivebi/bin/hiveEOF--Hive SQL Like:drop TABLE IF EXISTS

CD/: Entry root directory-----------------------[Email protected]:/etc$ CD/[Email protected]:/$ pwdCD ~: Entry user root directory----------------------[Email protected]:/$ CD ~[Email protected]:~$ pwd/home/tangymls : List all files.pwd : Show

1 loops (Command execution ... But the parameter will change)As in the following form:#!/usr/bin/env bash#encoding=utf-8a= "Value1value2value3value4value5value6" for I in $ado echo "cmd $i argv" doneNote: $a cannot be written as a "$a", otherwise it

conditional judgment of arithmetic operation [] [[]]:-eq-ne-Lt-le-gt-GE(( ))：>>==[[Email protected] ~]# if ((2 = = 3)); then echo ' 123 '; Fi[[Email protected] ~]# if ((2 >= 3); then echo ' 123 '; Fi[[Email protected] ~]# if ((2 123[[Email protected]

Now every time you analyze the site log, you need to determine whether Baidu Spider is a real spider, after nslookup need to determine if the result contains "Baidu" stringThe following is a list of some of the methods that the shell contains to

For the new company, the company's leadership is very good. I feel more of the place is, their work efficiency is obviously higher than before. In the past will be very impatient for frequent changes in demand, now received after the demand will be

In the shell, if a piece of code needs to be called repeatedly, the code definition can be called a function, which is called directly in a later script. There are two ways to define a function:1. function functionname {}2, functionname () {}Example:

1. Basic Scripting functions1.1 Definition of functionFunction name { commands}OrName () { commands}1.2 Simple example#!/bin/shfunction FUNC01 {echo "This is the function of FUNC01"}FUNC02 () {echo "This is function of FUNC02"}FUNC01FUNC02

##!/bin/bashecho "pleases Enter A.txt file (enter Q to exit)"READ-DQ Aecho ""echo "pleases Enter B.txt file (enter Q to exit)"READ-DQ Becho ""Cat >/root/a.txt $AEofCat >/root/b.txt $BEofC= ' Cat/root/a.txt | Grep-f/root/b.txt 'D= ' Cat/root/a.txt |

Example 1.The new test.sh content under/home/admin/test/is as follows:CD 'dirname $0echo 'pwd'Then return to/home/admin/to executesh test/test. SHOperation Result:/home/admin/testThis allows you to know the location of the files deployed with the

Color configuration involves the following places (I often use): command prompt, file and directory name display, ECHO-E command1. Color values are divided into foreground and background colors, and the corresponding relationship of color code

Write a shell script that requires you to print a line that contains only a single number in the document:#!/bin/bashfor i in ' cat/root/passwd ';d o n= ' echo $i |sed ' s/[^0-9]//g ' |wc-c ' #echo $n if [$n-eq 2];then Echo $i else continue

1. Variable and variable values (expanded)If you need a variable name, use the variable name directly, or if you need a variable value, use the $ symbol. For example:Export Path=/home/bin: $PATHIf you're not sure if you want the variable or expanded

Variable settings:~/dos # dfs=2 Variable use:You can read it using EHCO, but you need to precede the variable name with $, or the ${variable}.~/dos # echo $dfs 2 ~/dos # echo ${dfs}

In some scenarios where security requirements are high. SSH timeout is pre-set by the administrator, after idle for a period of time SSH connection will be actively disconnected.This scenario assumes that the script runs through SSH and the script

Suppose there is a variable var=http://www.google.com/test.htmA # Intercept, delete the left character, and leave the right character.Echo ${var#*//}where Var is the variable name and the # is an operator, *//indicates that the first//number and all

Backup of FTPPurpose : through Shell to upload the backed-up data to another server. FTP back up the server. Simulation Tomcat for production data. 650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M00/7D/BB/wKioL1bvOoaiyYeLAAAjXEUp800094.png "

In Linux systems, regular expressions (regularexpression) are powerful tools for finding, replacing, deleting, and so on for every Linux user, through the arrangement of special characters.In existing systems, regular expressions are also divided

In Linux systems, regular expressions (regularexpression) are powerful tools for finding, replacing, deleting, and so on for every Linux user, through the arrangement of special characters.In existing systems, regular expressions are also divided

Share a concurrent script that simulates multithreading under Linux, using this script to execute related commands on a defined number of servers at the same time, which is much more efficient than a normal for/while loop and can be executed in a