bash trim string

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Bash string processing (compared with Java)-6. judge whether the string is null (not empty)

In JavaJudge whether it is nullIs nullIf (s = null ){// Do something} Not nullIf (s! = Null ){// Do something} Determines whether null or empty stringIs null or empty string: method 1If (s = null | s. length () = 0 ){// Do something} Is null or

JS Trim to space best practice _javascript Tips

It was just last time a classmate asked questions. Just a self-test. Let's take a look at the P33 written in "JavaScript pristine". He extended a trim () method on a String object: Copy Code code as follows: Function.prototype.method

Expect in Linux to bulk modify user password scripts

1, before using expect, need to install two RPM package, The code is as follows Copy Code # RPM-IHV expect-5.43.0-8.el5.i386.rpm# RPM-IHV expect-devel-5.43.0-8.el5.i386.rpm 2, the batch modifies the password

Hive execution flowchart source code entry

Image address: http://hi.csdn.net/attachment/201107/29/0_1311922740tXqK.gif Clidriver is the entry of hive, corresponding to the UI section. You can see its structure. The main () function! Yes! You guessed it was from main.Is a class structure,

Linux Command Line skills ZZ

Http://cloud.csdn.net/a/20120321/313378.html Linux Command Line skills | 10540 views | [18 comments] comments Source: linuxstall.com | Author: chankey Pathak | add to my favorites I will share with you some tips on how to learn Linux Command

Linux Command Line skills

Http://cloud.csdn.net/a/20120321/313378.html I will share with you some tips on how to learn Linux Command lines, hoping to help you. If you encounter unfamiliar commands in this article, you can enter the following command on the terminal for help.

Linux Command Line Tips __linux

Turn from: http://cloud.csdn.net/a/20120321/313378.html I'll share some tips on how to learn the Linux command line and hopefully it will help. If you encounter unfamiliar commands in this article, you can type the following command in the

Linux Command Line Tips __linux

Linux Primer Prerequisites for bash: there's no need to delve into the proving Bash manual and learn from Man bash. Understand VI: You may use Emacs or eclipse in your work, but VI is irreplaceable. Learn about SSH: Learn the basics of password-free

Script programming on the graphic desktop in Linux command line and shell script programming

Linux command line and shell script programming Daquan graphic desktop script programming create text menu create menu layout [plain] #! /Bin/bashclear # clear screen echo-e & quot; \ t \ tMenu & quot; echo-e & quot; 1. \ tDisplaydiskspace & quot;

Script Programming on the graphic desktop in Linux Command Line and shell script Programming

Linux Command Line and shell script programming Daquan graphic desktop Script Programming create text menu create menu layout [plain] #! /Bin/bash clear # clear screen echo-e "\ t \ tMenu" echo-e "1. \ tDisplay disk space "echo-e" 2. \ tDisplay

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