Shell

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Example No. 2As a shell writer, often face the problem of inconsistent data format, the data standard session output is a need to solve the problem, this example takes MySQL time as an example, the script enters the month, the day, the year three

Print 99 multiplication table#for Statement Format#!/bin/bashfor ((a = 1; a Dofor ((b=1; bDoLet Sum=b*aEcho-ne "$a * $b = $sum \ t"Doneecho ""Done#while Statement Format#!/bin/bashA=1While [$a-le 9]DoB=1While [$b-le $a]DoLet sum= $a * $bEcho-ne

1. As an executable programSave the above code as test.sh and CD to the appropriate directory:+./test. #使脚本具有执行权限./test. #执行脚本 Note, be sure to write ./test.sh, not test.sh, run other binary programs also, the direct write Test.sh,linux

Color output via echo output, need to add-EECHO-E "\033[background color; font Color \033[0m"Background color40 Setting a black background41 Setting the red background42 Setting the green background43 Setting the brown background44 Setting the blue

First, Shell script introductionThe shell is a scripting language, and the shell is a collection of system commands1, can use logic judgment, cycle and other grammar;It's a bit like C language, but it's fundamentally different.2, can be customized

Concept:The commands that will be executed are saved sequentially to a text file, which can be run by giving the file an executable permission.The composition of the shell script:1) Script statement: The script declaration indicates which

Click to view the original blog.sedis the abbreviation for Stream editor, which is a non-interactive stream editor for filtering or converting text.Not to be continued ...ProfileSed Options ... Script [Input File ...]DescribesedThe editor is called

1. Expression of conditional judgment: [ 表达式 ] 或者 [[ 表达式 ]] 或者 test 表达式，要注意的是[ ]或者[[ ]]中括号内要与表达式之间用空格隔开，否则会报错。2.if Else FI conditional statement 格式： if 条件 ；then 如果条件为真则执行这里的语句 else

Tips Summary:String comparison with double brackets [[]]; arithmetic comparison with single brackets []--left and right spacesArithmetic operations with double parentheses (()); Shell commands and output parentheses ()--left and right without

#!/usr/bin/env BashFor year in/root/downloads/data/all/*DoEcho-ne ' basename $year. gz ' "\ T"Gunzip-c $year | \awk ' {temp = substr ($ 88, 5) + 0;Q = substr ($ 93, 1);if (temp! = 9999 && q ~/[01459]/&& temp > max) max = temp}END {print Max} 'Done#!/

Shell Basics1. What is a shellShell is a program developed by C language he is a bridge for users to use Linuxis both a command languageAn application This application provides an interface through which users access the operating system kernel's

Click Back to learn the path of the Linux command line and shell script5.1-shell Parent-child relationship1 common types of shells Bash is the Linux standard default Shell, which is an abbreviation for the Bunrneagain shell, with a total of

Functions: Code snippets that implement standalone functionalityfunction is only executed when calledSyntax One:function f_name{function body}Syntax Two:F_name () {function body}The return value of the function:Default function return value:

Shell Multi-Process basics Code block: With {} as a whole & function: Put the command in the background processing, idle out the current console for other operations Wait command: Waits for the parent process to execute the

#!/bin/Bash#declare D="2016-05-06 00:00:00"#d1=$(Date-D"$d"+%s);Echo$d 1#d2=$(Date+%y%m%d%h%m%s-d @ $d 1) #Echo$d * Current time month day #declare Currentsecond=$(Date+%y%m%d%h%m%S) #declare currentminute #当前时间 month and day=$(Date+%y%m%d%h%M)

13 Basic IF statementsFormat 1:if condition; Then statement; FiExecution result is 5Format 2:if condition; Then statement; else statement; Fi#!/bin/basha=5if [ $a -gt 10 ];then echo $aelse echo 0fiExecution result is 0Format 3:if ...; Then ...; Elif

Prerequisite: Configure your own machine ssh password-free login#!/bin/bashCat list1234EODWhile Read lineDoif SSH [email protected] "test-f/tmp/a.sh"; Then #配置了免密登录, no password is entered hereecho "$line file exist."Elseecho "$line file not exist."

Find./-mtime 18-exec ls-l {} \;Special places in this example are {} and \; And the-exec keyword, the meaning of these things: {} stands for "content found by find" and, as shown, the result of find is placed in the {} position; -exec

DownloadPlease download it to https://github.com/mbadolato/iTerm2-Color-Schemes.git clone https://github.com/mbadolato/iTerm2-Color-Schemes.gitInstallationTo install: Launch ITerm 2. Get the latest version at iterm2.com Type cmd+i (? +i)