script if

From: http://m.jb51.net/article/56553.htm This article mainly introduced the shell script if condition judgment and the judgment condition summary, this article first gave the IF condition judgment the grammar, then gave the commonly used judgment

If the score is 1-59, you must retake 60-79, good 80-90, excellent 90-100, and receive a scholarship.   #! /Bin/bash Read-P "Enter your score" sta   If [-Z $ sta] Then Echo "You did not enter the score" Read-P "Enter your score" sta If [-Z $

Shell script IF condition judgment and judgment condition details, shellifPreface: No matter what programming language, conditional judgment is indispensable. SHELL is no exception. if list thendo something hereelif list thendo another thing

The Shell has three kinds of if ... else statements:1.if. FI statement;2.if ... else ... fi statement;3.if. Elif ... else .... fi statement.If ... fi statementSyntax for the IF ... else statement:if [Expression] Then If Truefi Note: There must

Binary comparison operators, comparing variables or comparing numbers.Note the difference between a number and a string.1. Integer comparison[CPP]View PlainCopyprint? -eq equals, such as:if [ "$a"-eq " $b"] -ne not equal to, such as:if [ "$a"

1) What is the function of the IF condition control statement?The shell script is also a weak scripting language and supports if conditional control statements.2) If the structure syntaxSingle BranchIfThenFiDual

Presumably everyone knows "if ... So ... " The application of this grammar!Of course, Linux for this kind of usage is also considered, many times we need to write a shell script, it is unavoidable to avoid the IF statement.For example: Determine if

Objective:No matter what programming language is inseparable from conditional judgment. The shell is no exception.Copy CodeThe code is as follows:If List ThenDo something hereElif List ThenDo another thing hereElseDo something else hereFiEX1:Copy

Shell script, if judgment statement error [: Too many arguments I have encountered two situations: 1, the first situation is that the Internet, you can say, the string variable may exist in a space, shell resolution when it is considered to be more

(1) If statement[Email protected]:/mnt/shared/shellbox/shellif# cat shellif.sh #!/bin/bash# judgment string if ["$" = "Hello"]then echo "\$1= $ "fi# judgment number, if () mode can only be used under bash, not under sh if (>) then echo"

Unlike Java, PHP and other languages, the process control of SH is not NULL, such as: Copy Code code as follows: if (Isset ($_get["Q"])) { Search (q); } else { Doing nothing } ?> You can't write this in Sh/bash,

--------------------------------------------------------------- echo "Please Y-to continue"Read ynIf ["$yn" = "y"] | | ["$yn" = "Y"]; Thenecho "Script is running ..."Elseecho "stop!"Fi Note that there are spaces oh------------------------------------

  Design a prompt menu for user selection, and perform operations and display based on user selection. Menu: 1. Start vi Editor 2. Start x-windows and enter the graphic interface 3. Start the background printing process. 4. Exit ctrl + c. #!

[-A file] true if the file exists. [-B file] If the file exists and is a special block file, it is true. [-C file] If the file exists and is a special word file, it is true. [-D file] If the file exists and is a directory, it is true. [-E file] If

-S file file is somefile 0 o'clock [f]: Determines whether it is a file [- X "/bin/ls"]: Determines whether/BIN/LS exists and has executable permissions [-n "$var]": Judge $va 　　　　　R variable has a value ["$a" = "$b"]: To determine if $a and $b

Objective:no matter what programming language is inseparable from conditional judgment. The shell is no exception. Copy Code code as follows: If List Then Do something here Elif List Then Do another thing Else Do something

Something written in PHP. Some small things may be useful sometimes! 1. obtain the client IP address functiongetip () {if (! Empty ($ _ SERVER [HTTP_X_FORWARDED_FOR]) {proxy usage $ tipsplit (, $ _ SERVER [HTT some things may be useful sometimes! 1

/********************************************************************* * Author  : Samson * Date    : 05/07/2014 * Test platform: *              Mint 15-3.8.13.13 *              GNU bash, version 4.2.45 * *********************************************

Some little things written in PHP may sometimes be used! 1. obtain the client IP address. Function getip (){ If (! Empty ($ _ SERVER ["HTTP_X_FORWARDED_FOR"]) {// proxy usage $ Tip = split (",", $ _ SERVER ["HTTP_X_FORWARDED_FOR"]); $ Cip = $

**************************************** ******************* /*************************************** ******************************* Author: Samson* Date: 05/07/2014* Test platform:* Mint 15-3.8.13.13* GNU bash, version 4.2.45***********************