Shell

Processing of parameter processing-shell incoming parameters $#The number of arguments passed to the script $*Displays all parameters passed to the script in a single string. Unlike positional variables, this option parameter can be

Shell command:The shell recognizes three basic commands: Built-in commands, shell functions, and external commands:The built-in command is the command executed by the shell itself. Some orders are built on the basis of their necessity, for example:

#!/bin/baships=192.168.0Echo-n "Please enter network segment (default is $ips):"Read Network: ${network:= $ips}echo "Network: $network"D_ip_beg=1d_ip_end=254Echo-n "Input the HostIP (default $d _ip_beg $d _ip_end):"Read Ip_beg Ip_end: ${ip_beg:= $d _

Syntax: eval cmdlineEval will scan the back of the CmdLine two times , if after the first scan, cmdline is a normal command, then execute this command;If the cmdline contains an indirect reference to a variable, the semantics of the indirect

There are a bunch of host addresses:A.baidu.com...Z.baidu.comHow to extract the. Baidu.com letters from these data, such as: a b...z?When you see the problem, you first think about how to generate the file with a script:Ideas:1. Definition suffix:

Resources: Linux shell script Raiders author Sarath Lakshman People's post and telecommunications pressShell: Reads the contents of each line of the file and outputs the notation 1Purpose: Read the passwd file, get the user name and its default

#!/bin/bash#1, determine if the service is available 2, do not use restart TOMCAT#*/30 * * * */home/wsm/restart.sh >>/home/wsm/restart.log# Stop tomcatfunction Killtomcat () {pid= ' ps-ef | grep "/home/wsm/bin/tomcat" | grep-v grep | awk ' {print $}

Work fast two years, to Cnblogs also nearly two years, high-touch, but also at least into the program Ape Army.Finally opened the blog (do not laugh, belly ink is too little, are looking at the study of the Great God).I don't know what to

Reprint Please specify: Http://blog.csdn.net/wujysh1. View the values of the environment variables defined by the user shell under the current system.2. Define the value of the variable AK to 200 and display it on the screen.3. Define the value of

When you use Hadoop or deploy Hadoop, you often encounter situations where you want to copy files to other machines, but if the individual writes, it happens that the cluster is large and exhausting, and now uses an awk to write shell scripts that

A shell script is typically a one-time execution of the entire file, meaning the entire file is equivalent to the main function. But I just want to run the specified function. In fact, you can run using the function name as a parameter to run, it

Shell Background Run Programhttp://blog.csdn.net/courage89/article/details/10561041 & is most often usedThis is used at the end of a command, you can put this command in the background to execute CTRL + ZYou can put a command that is

Linux Shell && | |  shell returns a return value when executing a command that is saved in the shell variable $? In When $? = = 0 o'clock, indicating successful execution; = = 1 o'clock, which indicates that the execution failed.   Sometimes, the

If the leader tells you to check the company when you're off duty. Those PCs are open, one to see? NO, it's too much trouble. The following script can quickly find the surviving PC through the ICMP ping packet, it is important to note that the local

System Environment centos6.5[Email protected] wang]# uname-r2.6.32-431.el6.i686Official Add Account:[Email protected]/]# Useradd Wang #添加用户wang[[email protected]/]# tail-l/etc/passwd #用tail命令查看passwd文件,-l Display countdown 10 lines[Email protected]/]

1. Enter HBase Shell[Email protected]:~/hbase-0.98.8-hadoop1/conf$ hbase ShellHBase Shell; Enter ' help ' for list of supported commands.Type "exit" to leave the HBase ShellVersion 0.98.8-hadoop1, R6cfc8d064754251365e070a10a82eb169956d5fe, Fri Nov 17

1), the definition of the array (self-dividing):Static array= (123)Dynamic array array= ($ (command))Example:array= ($ (LS)) echo ${bb[@]} color01.sh color.sh ip.sh touch.sh tou.sh user.sh while01.sh while_02.sh2), display the contents of the

MacOSXRAMDisk (memory disk) Shell This article provides the ghost version of Mac OS X RAM Disk (memory Disk) Creation Program and practical instructions.Concerns When Mac thunder downloads, The IOPS is too high. It may be because the cache is not

Linux shell programming process control, linuxshell If statement: Test is used in the past. Example 1: When the hard disk exceeds 80%, notify the Administrator Example 2: Automatically Restart Apache when it is disabled Example 3:

Summary of the use of shell scripts and the use of shell scripts (1) The csh script can call the bash script, and vice versa. (2). How to call variables and functions defined in other scripts. (3). Defined variables. The default value is global