Shell

What is a function? Why do we use a function?I. Related knowledge of functionsThe function is to package the code with a specific function and provide an interface for use. The advantage of this is that code reuse can be achieved on one hand, for

Requirement-driven Linux Shell Programming Requirement-driven Linux Shell programmingtable of Contents 1. Where can I find the basic Material about Linux Shell programming? 2. How to time a function/program (Get the execution time of a

Write the name Auto_change_ gw.sh script, used to automatically switch the host gateway, the instructions are as follows: 1) There are 2 available gateway addresses, respectively, the primary gateway 192.168.10.254 and the standby gateway 192.168.10.

Linux CentOS under the shell display-bash-4.1$ does not display the user name path resolution problem Description: A new user is added under CentOS, and the shell script information is as follows: Instead of what we often see [email Protected] is a

Recently, Google was completely banned, and the code hosted on the Google SVN server was inaccessible.It's a waste of things. I unloaded the slow Win8 running in my old notebook, installed Ubuntu, mounted the svn server, and managed some personal

Using sh to write some small scripts will make the work easier, and some content may be unfamiliar to everyone (at least I am ),It is variable-related parameter expansion. Below are some simple descriptions and usage, which can make the code more

  Shell text filtering (grep) Classification: Linux Shell script LearningRead by 588Comment (0)FavoritesReport Shell Regular Expression extension tool Storage Grep (Global Regular Expression version) allows Pattern searches for text files. If the

In gnome 3, gnome-shell is used for displaying the top bar. the widgets can be installed online from http://extensions.gnome.org. after installation, the deployments can be set by visiting http://extensions.gnome.org/local. on local host, the

[[email protected] Learn]# cat useradd-final.sh #!/bin/bash#DEBUG=0ADD=0DEL=0help() {echo "Usage: $(basename $0) -v | --verbose | --add user1,user2,... | --del user1,user2,... | -h | --help"}while [ $# -ne 0 ]docase $1 in-h | --help )helpexit 0;;-v |

Tag: Shell PS: Today I added an O & M group, Hi brother .. I have to answer questions .. Then 650) This. width = 650; "src =" http://s3.51cto.com/wyfs02/M01/3E/00/wKioL1PF9FqRrUCKAABsKQiTqns966.jpg "Title =" qq 40716113536.jpg "alt ="

1. Name the variable Num = 2 Echo "this is {$ num} Nd" Output this is 2nd 2. Variable addition the default value is string addition. Var = 1var = $ var + 1 echo $ VaR Output 1 + 1 3. How to add mathematics: Let "Var + = 1" Var = "$ [$ var + 1]

Scan all hosts in the network segment. Online hosts are displayed in green. Offline hosts are displayed in red; Finally, the numbers of online and offline hosts are displayed respectively; In order to practice shell, only the for loop is used here,

1. Change the password Use the passwd command to change the password.   If the command is executed under the root user, the password of the root user is modified.2. Get help Use the LS -- Help Command to obtain help. 1 [[email protected] ~] $ Ls --

  Typeset can be used to set variable attributes, such as case, width, and left-right alignment. When typeset is used to change the attributes of a variable, this change is permanent, the following uses KSh as an example to demonstrate the

Method 1: Let arithmetic expression Example 1: [[email protected] Scripts]# A=2[[email protected] Scripts]# B=3[[email protected] Scripts]# let C=$A*$B[[email protected] Scripts]# echo $C6[[email protected] Scripts]# Method 2: $ [arithmetic

Shell string operation summary #! /Bin/bash######################################## #### Demonstrate string operations in bash## Output result######################################### ##STR = "abc123abcabc"# |-|# | ------- |# Calculate the length of

Shell text filtering (Regular Expression) classification: Linux Shell script learning 213 people read comments (0) collect reports When extracting or filtering text from a file or command output, you can use a regular expression (r e), which is a

I. Introduction Hbase is a distributed, column-oriented open-source database. It originated from Google's paper bigtable: a distributed storage system for structured data. Hbase is an open-source implementation of Google bigtable. It uses hadoop

(Linux shell) Chapter 2-joy of command (1), linuxshell This article is from my personal blog: (linux shell) Chapter 2 -- joy of command (1) In the previous chapter, we described some syntaxes that need to be paid attention to in linux shell. Next we

(Linux shell) Chapter 1-test the knife (on) and test the knife Source: (linux shell) Chapter 1-test tool (I) From today on, let's take a look at the book "linux shell script strategy. 1.1 Introduction A shell script is usually #! The starting text