Shell

Shell is an interactive command interpreter. Shell is independent of the operating system. This design allows you to flexibly choose the appropriate shell. Shell You can type a command in the command line,After being explained by shell, it is

Shell metacharacters and shell internal variables Shell metacharacters > Prog> file redirects the standard output to the file> Prog> file: attaches the standard output to the file.| P1 | P2 uses the P1 standard output as the P2 standard

Reprinted: http://blog.csdn.net/zuolongsnail/article/details/8167501 Run ADB shell AM broadcast on the command line to send broadcast notifications. Parameters following ADB shell AM broadcast include: [-A ][-D ][-T ][-C [-C ]...][-E | -- es ...

Chapter 2: more structured commands ForBasic Format for var in listdo commandsdone You can specify the list in the following ways:1. List for var in A B C D If the listed strings contain special characters, such as single quotes1) Use escape

Find out the difference between for and while, and write out the memo. Script: File =/home/hadoop/phrases.txt for content in 'cat $ {file} 'Do phrase = 'echo $ {content}' echo $ phrasedone The phrases.txt file contains the following content:

 FindSearch for files or directories. Syntax: Find [directory...] [-Amin ] [-anewer ] [-atime ] [-Cmin ] [-cnewer ] [-ctime ] [-daystart] [-depyh] [-empty] [-exec ] [-false] [-FLS ] [-follow] [-fprint ] [-fprint0 ] [-fprintf ] [-fstype ] [-gid ]

1. Eval command-line Command-new Roman; "> line is a common command line typed on the terminal.HoweverEvalThe result is shell.Scan it twice before executing the command line.For example: New Roman; "> pipe =" |" New Roman; "> eval ls $ pipe WC-l New

Iv. Loop Structure statements Common shell loop statements include for loop, while loop, and until loop. ForLoop Syntax: for variable in list Do Operation Done Note: The variable is used inside the loop to refer to the object in the List currently

1. view the current system memory usage (free ): The free command has the following common options: -B displays data in bytes. -K displays data in kilobytes (Kb) (default value ). -M displays data in MB. -S delay this option will enable

By using the runtime.exe cute method, we can run the Linux Shell script in a Java program or execute other programs. Referring to this article on the Internet: http://lee79.javaeye.com/blog/418549 (thanks), I rearranged the code.The

[Cracked by] layper[Author mailbox] layper2002@yahoo.com.cn[Author's homepage] www.sy135.com[Tools] peid, OD,[Cracking platform] Win9x/NT/2000/XP[Software name] single-step Analysis of Shell and shell chaos (5)[Statement of cracking] I am a cainiao.

Shell may often see: Echo log>/dev/null 2> & 1 Command results can be defined in the form of %>/Dev/null: Indicates an empty device file.>: Indicates the redirection location, for example, Echo "123">/home/123.txt1: Indicates stdout standard output.

# Method 1-- Character comparison #!/bin/bashstr1="hello"str2="he"str3="lo"if [ ${str1:0:2} = $str2 ]; then echo "$str1 include $str2"fiif [ ${str1:2:4} = $str3 ]then echo "$str1 include $str3"else echo "$str1 not include $str3"fi Running

1. query the row number of the string. Grep-n "XXX" str.txt #-N print the prefix of the number of lines where the character "XXX" is located in the file "stringstr.txt" Example: Str.txt XxxYyyZzzXxx Enter the SEARCH Command: grep-n "XXX"

2. In some software installation processes, you need to create an independent user and then run some installation operations such as gitolite installation, create a git user and execute the installation. Method 1:sudo -u user ... Sudo-u Git-H

1. Linux script compiling Basics1.1 Basic syntax IntroductionStart with 1.1.1The program must start with the following line (must begin with the first line of the file ):#! /Bin/shSymbol #! The parameter used to tell the system that the program is

Install and use a peanut shell (Linux). I did this: First you have to have a peanut shell account, must apply to the http://www.oray.com. Follow these steps. 1. Open the Web http://www.oray.com/peanuthull/download_linux.php In the XP BrowserButton

Use 'grep' to search for text files If you want to find a string in several text files, you can use the 'grep' command. 'Grep' searches for the specified string in the text. For example, if you are searching for a file with the string 'Magic 'in the'

The memory of the android program is divided into two parts: Native and Dalvik. Dalvik is the Java heap we usually call. The objects we create are allocated here, bitmap is directly allocated on native. The memory limit is that native + Dalvik

Comparison of strings and values in Shell Binary comparison operator, which compares variables or numbers. Note the difference between numbers and strings. Integer comparison -EQ equals to, for example, if ["$ A"-EQ "$ B"]-Ne is not equal to, for