Shell

RecommendedArticle: APIS for file path operations in Shell Http://www.cnblogs.com/fangkm/archive/2009/04/15/1436674.html   I wanted to sort it out by myself, but I found the above article by Google according to the title of the phenomenon, and I

You can change the shell in three ways: 1. Change the default shell for all later logon sessions Enter the command CHSH-L to view the available shell and its path of the current system. After entering CHSH, the system prompts you to enter the

The source command can load another script in one script. The following is an example: First, we define a function script named myfunc. Sh, as follows: #! /Bin/bashFunction Square{Local tempLet temp = $1*$1The sum of squares of Echo "$1 is: $ Temp"

Shell script debugging-run log 1   This article mainly describes how to output debug logs in shell scripts.   C/C ++ debug log In C/C ++, _ file __, _ FUNC __, _ line _ indicates which log of the current row comes fromSource codeWhich

Normal 0 7.8 磅 0 2 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable{mso-style-name:普通表格;mso-tstyle-rowband-size:0;mso-tstyle-colband-size:0;mso-style-

Compare shell strings and determine whether the string is a numberBinary comparison operator, which compares variables or numbers. Note the difference between numbers and strings. ◆ Integer comparison -EQ equals to, for example, if ["$ A"-EQ "$

Tangent to Vertex Returns a convex polygon.P, TangentLIsPIntersection andPInternalL. This concept is similar to orthogonal tangent. Pair of vertex points If two verticesPAndQ(BelongP) In the two parallel tangent lines, they form a pair of

A simple shell Backdoor Author: Pony/smallhorse [e.s. t VIP] (it doesn't matter if you do not write this e.s. t VIP)Source: evil baboons China Recently, I was bored and thought about writing a simple shell backdoor. At the same time, anti-virus

TR is used to delete control characters in a file or convert characters.Syntax: TR [-C/D/S/T] [set1] [set2]Set1: Character Set 1Set2: Character Set 2-C: complement. Use set2 to replace characters not included in set1.-D: delete all characters in set1

The daily log analysis team is really sorry. We often need to provide statistics such as PV, UV, and independent IP addresses. C/C ++ and Java can all be used to write logs. The process is like this, first, read the file, scan it row by row, put the

Do you still remember the regular expression that used to calculate prime numbers? The world of programming is so interesting that you will always be able to see something special. Have you ever thought that you can put your variables and functions

2011-04-23 wcdj   The method for learning shell program design is: Hands-on + man command The following scripts are all tested in cygwin.$/Bin/Bash -- versionGNU bash, version 2.05b.0 (1)-release (i686-pc-cygwin)Copyright (c) 2002 Free Software

Format: Test conditions Test-N string: string is not emptyTest-Z string: string is empty Test int1-EQ int2: int1 = int 2Test int1-ne int2: int1! = Int2Test int1-GT int2: int1> int2Test int1-ge int2: int1> = int2Test int1-lt int2: int1 Test int1-Le

This script was modified on the cache cleanup script of Zhang banquet, mainly to add the if option, and select the address of the cached file based on the $1 parameter type (because $1 is not fixed, sometimes it is a specific JPG type, sometimes it

The Common commands of ADB shell in Android and the methods for viewing application database information under cmd are as follows: CMD -- ADB shell: Enter the shell command interface of the simulator. Ls displays all the file directories in the

1) Create FunctionName { ... } Or: Name (){ ... }   2) Call Use the function name directly. The function can be called only after it is defined; When a function has the same name, the new definition will overwrite the old definition and no

Ls -L, show the hard link count; -I, show I-node -H, human readable -T, sort by modify time -S, sort by size -R, -- reverse -R, show content of sub-Dir -V, sort by version  CP -P,Retain source file attributes, such as the modification time -L,

Shell basics 5: Input and Output (echo, read, Cat, pipeline, Tee, redirection, etc) All the environments below are tested in RedHat Linux9In Linux, to make the Escape Character take effect, you need to add the parameter-eStart with the echo

Let's take a look at an example: #!/bin/basharea2=(zero one two three four)echo "Origin is :"echo ${area2[0]} ${area2[1]} ${area2[2]} ${area2[3]} ${area2[4]}area2[1]=1area2[4]=4echo "After is :"echo ${area2[0]} ${area2[1]} ${area2[2]} ${area2[3]} ${

I. Shell Condition Statement (if usage) If statement structure [if/then/Elif/else/FI]   If condition test statement Then Action [Elif Condition Action Else Action ] Fi   If you are not clear about the conditional test statement, refer