Shell

/*************************************** ******************************* Author: Samson* Date: 08/01/2013 **************************************** ****************************/ BASH Shell script programming learning summary: Variable:(1)

Refer to Linux Command, editor and shell programming (Tsinghua University Press) When shell is started, it will run the Startup File to initialize itself. The specific file to run depends on whether the shell is a login shell or a non-Login Shell

Author: Leal Authorization license: Create sharing agreement GNU Free Documentation License Edited by: firehare, dbzhang800   We can use any text editor, such as gedit, kedit, emacs, VI, to write shell scripts. It must start

Shell scripts contain several Unix commands or executeProgram.   1. Run the shell script There are two ways to run shell scripts. The first method is to use the sh command to take the shell script file name as a parameter. This method requires

The requirement today is to write the creation of all tables to the storage process. After receiving the script for creating a table, it is silly. There are 60-70 tables, including stored procedures and views. How can this problem be solved.

Transferred from: Feng yunzhi:Http://witmax.cn/shell-echo-spaces.html When the echo variable is in shell, only one space is printed in the variable, as shown below: 1 Sh-3.2$ TMP="A B d"2 Sh-3.2$ Echo $ TMP3 A B d The solution is to add double

1. Install busybox Busybox is a single executable implementation of standard Linux tools. Busybox contains some simple tools, such as CAT and ECHO, and some larger and more complex tools, such as grep, find, mount, and telnet. Some people refer to

Bash Basics   About commands and command types Use the hash table for the command Bash to accelerate the next search. To add a frequently used command, use the hash cmdBash executes commands with the same name in the path in the following sequence:

Java code execution shell command 20:48:20 Some system information in Android does not directly provide API interfaces for access. To obtain system information, we need to use shell commands to obtain information. In this case, we can execute

(I = $ J + $ k ))  Equivalent to I = 'expr $ J + $ K'(I = $ J-$ k ))   Equivalent I = 'expr $ J-$ K'(I = $ J * $ k ))   Equivalent I = 'expr $ J \ * $ K'(I = $ J/$ k ))   Equivalent I = 'expr $ J/$ K' Let expressionsExecute one or more expressions. $

1. Linux Command exit-description of the purpose of exiting the Current Shell The exit command is used to exit the current shell. In the shell script, you can terminate the execution of the current script. If you do not exit, you may continue to

A script developed for colleagues to quickly switch the environment of the home and Unit Tell application "system events" Set proxy_dialog to display dialog "proxy module (Ethernet version):" Buttons {"enable proxy Mode 1", "enable proxy Mode 2 ",

1. If statement If the "if" expression is true, the part after then is executed:Toggle line numbers 1 If...; then2 ....3 Elif...; then4 ....5 else6 ....7 fi In most cases, you can use test commands to test conditions, such as comparing strings,

#! /Bin/sh# Modprobe ipt_masquerade Modprobe ip_conntrack_ftp Modprobe ip_nat_ftp Iptables-F Iptables-T nat-F Iptables-x Iptables-T nat-x ########################### Input key################################### Iptables-P input drop Iptables-A input-

Set in cron and execute at every Monday (full backup every Monday, Incremental backup for the rest of the time) # Vi backup. Sh Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->#! /Bin/bash #

1. Shell checks whether a file or directory exists or has permissions 2 .#! /Bin/sh 3. 4. mypath = "/var/log/httpd /" 5. myfile = "/var/log/httpd/access. log" 6. 7. # Here, the-x parameter determines whether $ mypath exists and has executable

PS1 = '[/[/033 [01; 32 m/]/h:/[/033 [01; 34 m/]/W/[/033 [00 m/]/$' A brief explanation:The useful information is as follows:PS1 = '[/h:/W]/$'/H display the current host name/W display the current directory/$ Prompt[] For beauty The result is as

If you want to know the source code of HDFS, you can read his javaeye from Brother Cai bin.  Sorry, I used the word "mysterious killer" because it really hurt me so much that I took a lot of energy to pick it up. Recently, when testing hadoop, The

This article is the seventh chapter of "Learning the bash Shell" 3rd Edition, "Input/Output and Command-Line Processing. Our goal is to read books thin. Echo and printf are both written. read is used for reading. The format is: ReadVar1 var2...

In fact, the interactive interpretation and execution of user input commands as a command language is only one aspect of the Shell function, Shell can also be used for program design, it provides a variety of methods to define variables and