Shell

The syntax format of case is as follows:Case VaR inExp-1) command body 1 ;;Exp-2) command body 2 ;;...*) Command body ;;Shell calculates the value of the variable VAR, and compares the result with the formula exp-1 and exp-2 until a matching formula

Execute the SQL statement of the Oracle database in Shell #### Function #### Description: Execute an SQL statement ### input parameters: {SQL statement} {database TNS} {database user name} {Database User Password} #### output parameters: SQL

1. display the top 10 processes that consume the most memory/cpu ps aux | sort-NK + 4 | tailps aux | sort-NK + 3 | tail ---------------------------------------- 2. view the number of concurrent Apache requests and their TCP connection status netstat-

Reprinted: http://www.360doc.com/content/10/0303/16/155970_17438894.shtml Example 4-2. Simple variable assignment 1 #! /Bin/bash 2 # "naked" variable 3 4 Echo 5 6 # When is the variable "naked", such as when the front side is less than $? 7

  #! /Bin/bash # Add the hostnameRead-P "Please input your hostname:" hostname Old = 'cat/etc/sysconfig/Network | grep hostname | awk-F = '{print $2 }''Sed-I "s/$ old/$ Hostname/g"/etc/sysconfig/Network Echo "the/etc/sysconfig/network has changed,

  Suppose I want to run a script with parameters. After running the script, the screen displays the following data: What is the program file name? How many parameters are there? If the number of parameters is smaller than 2, the user is notified

1. query all files with no Suffix in the current directory: Find.-Type F-and! -Name "*.*" 2. query all files in the current folder that use the Windows Line Break (CRLF) and have no suffix. Use the-M parameter to convert them to Unix format (LF ).

Http://baike.baidu.com/view/2838635.htm? Fromid = 58531 Windows Power shell ask for help editing encyclopedia business cards Windows Power Shell Windows powershell is a command line shell program and script environment that allows command line

Let's start with an example: x=1+1echo $x Are you expecting output 2? Let you down. The output result is 1 + 1. Why? This is because the variable type in shell script is "string" by default, so if the variable type is not specified, 1 + 1 is a

1. Get the return value of Command Execution ? 2. Get the return value of Script Execution #!/bin/bashecho "A test."exit 0 Echo $ ?, Output: 0 3. Execute programs in the background in Linux In Windows, use the start command and specify the/B

Parameters:% H (expressed in-23 ).% I hour (expressed as 01-12 ).% K hour (expressed as 0-23 ).% L hour (expressed as 0-12 ).% M minutes (expressed in-59 ).% P am or PM.% R time (including hour, minute, and second, expressed in 12 hours AM/PM ).% S

This afternoon, I was busy writing a small script one afternoon. There were a lot of errors in the middle. I found the details about sort and uniq, and I found some minor mistakes in writing the script myself, programming is a strictly prohibited

Write a script to create and manage LV:Note: During script execution, a menu is displayed to the user, as shown in the following figure:A create an LV.B create an LV in an existing VG.C extend an LV.D reduce an LV. If you select item A, the

[Starting text] Ln is a magic command. It can create a file shadow or enter another place through one channel. :) In fact, all these tricks are implemented through soft connections and hard connections. Let us assume that you have read the article

Color is selected by adding a special sequence --Basically"/E ["And"M"Between numeric values. If more than one numeric code is specified, separate them with semicolons.Echo-e "/E [31; 40 m" First digit (31)Foreground color(Red); The second digit is(4

Command line parameters when running the script, as shown in figure ./myscript.sh -a -b arg In scripts, case statements are usually used for processing. My personal favorite practice: first try to use long parameter names (short parameter names are

Today, I am mainly going to have a deep understanding of the assembly language. If I want to decompile the language, this is not enough. Of course, this is not a day or two that can be successful. Continue to work hard.   I. How to distinguish the

Source Address: http://space.itpub.net/10687260/viewspace-293440 [-A file] true if the file exists.W (g3cu. T * mb7q6a0[-B file] If the file exists and is a special block file, it is true.S8ydayx 'gi0[-C file] If the file exists and is a special

1. Retrieve the number of times the shell appears in the/etc/passwd file Problem: The following is part of a/etc/passwd file. Obtain the shell and count the number of times. Shell refers to the following/bin/bash,/sbin/nologin, for example, the

UNIX System Variables$? The return code of the previous command or function.$ # Number of parameters$, $0 is the program body, from $1, $2, $3 is the parameter$ * String: saves all parameters in the form of "parameter 1 parameter 2 ..."$ @ String