Shell

Programmers are lazy, you know. Recently in development, you need to use the server's IP and Mac information. But the server is installed on the Linux system, for the multiple network, in the acquisition of IP generated a lot of problems. The

This article mainly introduces examples of shell programmingFirst, the logical judgment if statement 1. Judging the age?[[email protected] 9_1 ]#cat iftest.sh #!/bin/bashread -p "Please input your age:" age ## 判断用户输入的必须是数字if [[ "$age" =~ ^[0-9]

In general, it is necessary to determine the device type and system version in the development of Android programs.1, equipment type judgmentFor example, the judgment belongs to Google Nexus 5,nexus 7,MIUI V5, MIUI V6, Samsung devices, Meizu devices,

Now open the browser has a variety of relevant plug-ins available, take word translation, etc. at your fingertips, but in the command line to browse the information encountered when the new words copied to the online search, one back more annoying,

Example No. 1As a shell writer, to avoid the user's input data is malformed, that is, to intercept the possible errors before the shell script is published, this example is to determine whether the data (or positional variables) entered by the user

First, view the help command, parameter--helpD:\>adb shell screenrecord --helpusage: screenrecord [options] android screenrecord v1.2.  records the device ' S display to a  .mp4 file. options:--size widthxheight    set the video size, e.g.  " 1280x72

In the daily system management work, the need to write scripts to complete specific functions, writing shell scripts is a basic skill!In the process of writing, master some common skills and grammar can do most of the functions, that is, 2/8

If ....; Then....Elif ...; Then....Else....FiIn most cases, you can use test commands to test the condition. 　　For example, you can compare strings, determine whether the file exists and whether it is readable, etc... The condition test is usually

See the world from the shell 's eyesecho- display a line of textWhen you enter a command,bash expands on the characters you enter before executing the command. Path expansionecho *The Shell expands * to the name of the file under the current

1 shell overviewThe shell is a command interpreter that provides the user with an interface system-level program that sends a request to the Linux kernel to run the program. The user can start, suspend, stop, or even write some programs with the

FS ShellThe call file system (FS) shell command should use the form Bin/hadoop FS . All of the FS shell commands use URI paths as parameters. The URI format is scheme://authority/path. For the HDFs file system, Scheme is HDFs, to the local file

Set bash options with built-in set and SHOPT commandsThe set command can be used to customize the shell environment, using the option "O" to turn options on or off. For example, open the options: Set-o option, close the Select item: Set +O

one, the Linux shell wildcard character (wildcard)Wildcards are handled by the shell (not by the command statements involved, but we are not aware of these wildcard characters in the shell commands), it will only appear in the "Parameters" of the

Sed command Sed only edits the copy of the original file in the buffer and does not change the source file. Therefore, to save the file, you must redirect it to another file. Sed: 1. Sed [Option] 'sed command 'input file 2. Sed [Option]-F sed script

In a Windows environment, even though there are differences between Visual C ++, Delphi, and other software development tools, there is one thing that is the same: these are all running in windows. In the process of program development, you often

In the Win32 operating system (including Win9x, Windows NT, and Windows 2000), Microsoft not only has a convenient graphical user (GUI) interface, but also retains powerful scalability for the Windows user interface. For the operating environment on

This is a consulting report on csdn today. I think it is very practical, and I have never paid attention to shell and the potential of graphics before. So I would like to take a note. By Martin Streicher, http://sd.csdn.net/a/20110420/296194.html    

This article is the Reading Notes of customizing your environment, chapter 3 of learning the bash shell 3rd edition. Setting up a good user environment is crucial for our development. This section describes four aspects: special files, aliases,

Kafree collection Source: The source cannot be determined for Forum reprinting. Please contact us if you have any copyright questions. 1. Stream Object Component: "Adodb. Stream" There are the following methods: Cancel Method The usage is as

Single quotation marks, double quotation marks, and reverse quotation marks in shellIn shell, there are three types of quotation marks: single quotation marks, double quotation marks, and reverse quotation marks. Single quotation marks 'all