Shell

Transfer from http://www.cnblogs.com/dwdxdy/archive/2012/07/25/2608816.htmlThe style files are often processed on a line-by-row basis, how to get each row of data in the shell, then process the row data, and finally read the next row of data, loop

For C in a B C D E F g;do echo $c; Done sequentially outputFor C in a B C D E F g;do tar czvf install.log. $c. tar.gz Install.log; DoneFor C in {a.. g}; do echo $c; Done the same as aboveSeq 1 10 columns of numbersFor i in {1..10}; do echo $i;

Write a script that calculates all the odd and all the even numbers within 100 and displays them separately#! /bin/bashSum1=0For i in ' SEQ 1 2 100 'Dosum1=$[$sum 1+ $i]Doneecho $sum 1Sum2=0For j in ' SEQ 2 2 100 'Dosum2=$[$sum $j]DoneEcho $sum

1:declare commandshell Default is String typeIf subtraction is required, it needs to be defined as an integral typeDECLARE command: Change the default variable type Decalre [+/-] [option] Variable name-set type properties for variables+ Cancel

(1) Write a script: If a path does not exist, it is created as a directory, otherwise it is present, and the content type is displayed#!/bin/bash#if [$#-lt 1]; Then echo "Plz Enter a path:" Exit 1fi if [-e $]; Then file $1else mkdir-p $1fi ~Test

if condition judgment; ThenStatmentElseStatmentFiOrif condition judgment; ThenStatmentElifStatmentFiAnti-quote: Returns the execution result of the command to the variable.Set UserIDUserID = ' Id-u user1 'command to end a script prematurely: exit:

In addition to ordinary characters in the shell, there are many characters with special meanings and functions.1. Wildcard characters* : string of any length? : Matches any single character[]: Matches any one of these characters, for example:[ABC]

Directory:First, the operation Principle of shell programSecond, Shell common skills1. Command history2. Command aliases3. Command Reference4. File name Wildcard5. Common shortcut keys6. Complement function7. Input and output redirection and piping8.

#!/bin/bash# defines greatest common divisor and the minimum number of conventions gcd_result= "lcm_result=" "#定义一个相加的函数function  sum ()  { result=$ (  num1+num2 )   echo -e  "\033[31m  two number of $result \033[0m"}# Define a greatest common

1.cdCD-Back to last catalogCD returns the current user's home directory2.mkdirMkdir-p Creating a multilevel directoryEg:mkdir-p Test1/test2/test33.findFind-empty Finding empty DocumentsFind-user XXX View all information about user xxxFind-mtime-1

First, homework (exercise) content:1. Describe the operation principle of shell program (can be attached with necessary graphic instructions);2, summarize all the knowledge points involved in shell programming (such as: variables, grammar, command

Read Catalogue Numerical test File test String test The test command in the shell is used to check if a condition is true, and it can be tested in three ways, such as numeric values, files, and characters.

List the number of connections per IPawk ' /^tcp/{print} ' awk ' !/^::/{print $ {} ' Sort Uniq Sort awk ' begin{printf "%-10s%s\n", "Connum", "IP"}{printf "%-10s%s\n", $1,$2} 'Command explanation: Netstat-n refused to display aliases, can

Key function Ctrl+d Keyboard input end or exit terminal Ctrl+s Tentative current program, pause and press any key to resume operation Ctrl+z Put the current program in the

Too lazy, these days seem to have been lazy cancer, do not want to write a blog. Later think about, knowledge, or share the good. The first to cure their own lazy cancer; second, consolidate your knowledge by the way. There are two types of

In order to match the previous text, here first to organize a key how to deploy LNMP environment;In fact, small and medium-sized enterprises in the production environment is also very like to use such software packages, because after all, the source

#!/bin/bashfor I in {1..9}dofor j in ' seq 1 $i ' dom= ' echo "$i" "*" "$j" |bc ' Echo-n "$j" x "$i" = "$m" "" Doneecho "" DoneExecution Result:[Email protected] shell]#./99.sh1 x 1 = 11 x 2 = 2 2 x 2 = 41 x 3 = 3 2 x 3 = 6 3 x 3 = 91 x 4 = 4 2 x 4 =

This article is intended to review the definition and assignment of arrays in shell script programming, to read arrays, and to get the length of an arrayKnowledge Reserve Array : Multiple contiguous separate memory spaces, each memory

Encounter FTP to more than one machine problem, waiting for the last execution to execute the next, time will be longer, if you can simultaneously send files to multiple machines, you can achieve the purpose of saving time.Grammatical

PackageCom.edu.hpu.sort.insert.shell;Importjava.util.Arrays;ImportCom.edu.hpu.sort.Sort; Public classShellsortextendsSort {@Override Public int[] Dosort (int[] arr) { intLen =arr.length; //all step probabilities (for the first half of the