Shell

Have you ever encountered such a situation: from the remote Linux environment of the software, you have compressed a large pile of files into a .tar.gz file, which has not been completed for half an hour in a row. Then, suddenly you are disconnected

Fork Usage: fork/directory/script. Sh Fork is the most common. It uses/directory/script. Sh directly in the script to call the script. Sh script. Run a sub-shell script to execute the call. When Sub-shell is executed, parent-shell is still

[-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 character file, it is true. [-D file] If the file exists and is a directory, it is true. [-e

I saw a command line prompt from my colleagues on my system (Linux), which had a color and smiling face. I think it's cool, and I also copied it, Display Policy: current user, time, current directory, If a common user displays a smiling face,

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"

  #/Bin/bash 1, Wildcard *: Match any character or string, including an empty string. ? : Match any character. For example :?ABCCan match anyABCIt is a string of four characters that can be switched to or from any character. […]: Match any single

root@bt:~/test# chgrp --helpUsage: chgrp [OPTION]... GROUP FILE... or: chgrp [OPTION]... --reference=RFILE FILE...Change the group of each FILE to GROUP.With --reference, change the group of each FILE to that of RFILE. -c, --changes like

Assume that the two files file1 and file2 are represented by a and B. The content of file1 is as follows: A B C E d The content of file2 is as follows: C d A C There are basically two methods: one is the comm command and the other is the

#! /Bin/sh# The first line is to tell the system who will execute this dumb. $ ## Number of parameters transferred to the script$ # ID of the current process during script running, often used as the suffix of temporary variables, such as haison. $$!

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

Note: No space is allowed between the left and right sides of "=". The semicolon program 1 # is not required at the end of the bash statement #! /Bin/sh # echo somethingecho "Hello World" Echo "Hello !! "CD/root/export topmkdir./ABC Program 2,

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,

1. Glossary: The following is Wikipedia's explanation: Here document[1], also known as heredoc, hereis, here-string or here-script, is a shell (such as SH, CSH, KSh, Bash, powershell, and zsh) in the command line) and define a string method in the

Forwarded from blog: http://www.51testing.com /? Uid-390472-action-viewspace-itemid-232903   TimeCommand is used to print the execution time of a command or program.Time The time, system time, and time used in the execution of a command in

Document directory Determine whether the file is a device file Add User: IP address access statistics: Calculate the sum of 2 numbers Text Analysis File Sorting Print the swap partition size of the Local Machine Output the time used to

Lesson 6 variables Part 2 shell programming 7.1 define variables Format: Name = value # Note: there cannot be spaces on both sides of the equal sign! This is different from other scripting languages: value can be defined as a variable value without

14th class hour Functions 14.1 create and use functions Format: Name () {list ;}   An important feature of Shell functions is that they can be used to replace binary executable files or shell built-in commands with the same name. For example: CD () {

The color of the text terminal can be generated using an ANSI unconventional character sequence. Example:   Echo-e "/033 [44; 37; 5 m me/033 [0 m Cool"   The preceding command sets the background color to blue, the foreground color to white, the

My platform: Ubuntu 10.04Solution 1:Lsusb, view the vendorid, and add or modify the 51-android.rules file in the/etc/udev/rules. d/directory.Add a record:Subsystem = "USB", sysfs {idvendor} = "XXXX ",Mode = "0666" where XXXX is the value obtained

In Java, you can call the Execcommand method to run the shell script. The following is an example: 1 .#! /System/bin/sh 2. # The simplest shell with no function 3. # It must be noted that #! Start with/system/bin/sh (with spaces) 4. # different from