Shell

$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 $ =

we know that variables are inherited by quilt processes, it can be used directly. In some cases, you may need to inherit functions to facilitate transparent use. The method is very simple. Use "Export-F". Pay attention to the parameter "-F", which

Reprinted: http://langzhe.iteye.com/blog/671762     Prerequisites: the Erl file must be compiled using the debug_info option. Otherwise, the invalid beam file or no abstract code will appear:Error Compilation Method: Make: All ([debug_info]). |C

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

I recently tested LTP. I felt that there were too few materials on hand. I searched the internet and said that I had to look at the code from the beginning, because I had to look at the links in the past, there are too many test cases, so it is no

Some shell combinations CTRL + L: Clear the screen CTRL + W: delete the word starting at cursorCTRL + u: Clear the line I. e. Delete the all words from Command LineTab: auto-complete files, directory, command names and much moreCTRL + R: search

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

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)

-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 file: true if the file exists-F file: if the

  #! /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,

  #! /Bin/bash Tc_home =/opt/Oracle/tomcat/ InstanceName = $1 [created instance]   CD...>/dev/null Template_dir = 'pwd' Echo $ template_dir If [! -D $ tc_home]; then Mkdir-p $ tc_home [Create if the directory does not exist] Fi   Usemethod

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

Shell scripts are similar to the C language and also have a fixed language format. in short, shell scripts are like batch processing files (. BAT), the most basic function is to write a lot of commands together, so that users can easily execute a

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

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

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

[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

1. system environment variables after the user logs on to the system:$ Home user's own directory$ Path: the directory to be searched during Command Execution$ TZ Time Zone$ Mailcheck the number of seconds to check whether a new letter exists$ PS1

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