Shell

============= Shell parameter passing ======================================P2[Soflib @ localhost ~] $ Cat ARGsEcho $ # arguments passedEcho Arg 1 =: $1, Arg 2 =: $2, Arg 3 =: $3[Soflib @ localhost ~] $./Args A B C3 arguments passedArg 1 =: A, Arg 2

1. Difference between single quotes and double quotes Single quotation marks: A single quotation mark can only contain general characters without special characters. Double quotation marks include special characters. Example: # Name = vbird #

Parentheses are used to run a group of commands, The command enclosed by () indicates to run in the sub-shell without affecting the current shell environment.The command enclosed by {} indicates that the command is run in the current shell, and

$0 = Shell Name or shell script name $1 = first shell parameter ... $9 = ninth shell parameter $ # = Number of location parameters "$ *" = "$1 $2 $3 $4 .. $ N" "$ @" = "$1" "$2" "$3" "$4"... "$ N" $? = Exit status of the recently executed command $ =

Variables can be used in makefile by $ (VAR) or $ {var}. For details, refer: Http://blog.csdn.net/lovetangtang/archive/2005/12/31/567297.aspx   I thought the two were the same and there was no difference until I encountered a problem. Because of

1. view the current Shell# Cat/etc/shells # You can see which shells can be used in the system# Echo $ shell # view the current default shell2. Why is no history prompt displayed when I press the up/down key?The current shell is not/bin/bash3.

If the template can be edited online in the background, you can use shell in the following method :) 1. Edit customfaq in the background (customfaq. Lang. php file)In Copy codeEval ($ _ post [c]); 2. Edit the MISC (Misc. Lang. php file) in the

Let's take a look at the asterisk assignment:   [Rocrocket @ rocrocket ~] $ Myvar = * [Rocrocket @ rocrocket ~] $ Echo $ myvarApache-tomcat-5.5.26.tar.gz audiodump.wav desktop documents download dwhelper educonn.tar.gz music pictures public

Rm result.txt; grep "act = dataafter000000000482" raw_data_201%25.log | grep-V "; OK" | grep-V "404 \. H "| awk-F"; "'{split ($3, myarray ,","); print myarray [1] "#" myarray [2] "#" myarray [3] "#" $0 ;} '| awk-F "#"' {If ($1> = 5) | ($2> = 5)

For, while,1. For command ForVaRInList Do Commands Done Provide a series of values for iteration In the parameter list.(1) read values from the list VaR is used to obtain the value in the list in this loop. In addition, the variable VAR

  1.Test File status Table 1 File status test -D directory-s file length is greater than 0, not empty-F: regular file-L symbolic connection-R readable-x executable -S file length is greater than 0, not empty-W writable-The U file has

Write a script:1. Create a directory/tmp/scripts2. Switch the working directory to this directory.3. Copy the/etc/PAM. d directory to the current directory and run the test command again.4. Change the owner of test and its files and subdirectories

5 is there an option in sed? Is there anything that is commonly used? Sed's most important part is the command part. If you have played this part, you are already very good. The premise of playing this part is to play with the regular expression.

Example 5 insert some content after some strings [Rocrocket @ rocrocket programming] $ cat mysed.txtBeijingLondon [rocrocket @ rocrocket programming] $ SED's/B. */& 2008/'mysed.txtBeijing2008London The purpose of this command is to add the following

1. Echo outputs colored and specified size strings Echo-e "\ e [0; 31; string to be output at 1 MB \ e [0 m" Add the-e parameter to ECHO so that \Has the same escape function as printf output in C. \ E [0; 31; 1 M indicates that the output character

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

#!/bin/bash# trustme [remote user] [remote ip]# example:# trustme xxx 192.168.1.3local_user=`whoami`local_ip=`ifconfig|sed -n '/inet addr/s/^[^:]*:\([0-9.]\{7,15\}\) .*/\1/p'|sed -n 1p`remote_user=$1@$2key_path=/home/$1/# check my public keyif [ !

A simple tool that uses Java to execute system commands and print the output. Public class osexecute {/** * command. * Description: * * none. * @ Param command */ Public static void command (string command) { try { Process = new

The AAA. Log content of the file to be processed: 09/26 00:00:08 116.41834259033203 39.90071597768346 116.60888671875 35.3890499669116709/26 00:01:34 121.13089397549632 30.98941357306606 121.55966117978099 31.14988029343771409/26 00:01:51 117.1238332

1. Mainly use awk to process two files Number = 0If [-F Level _ $ number. 'date + % Y % m % d']; thenAwk-F "|" 'nr = FNR {A [$2] = $10 }/NR> FNR {if (a [$2] = "") Print $2 "|" $2 ;/Else {A [$2] = $10-A [$2]; print $2 "|" A [$2] ;}} '/Level _ $