Shell

Note This article compiles from the Commandlinefu.com series article top Ten one-liners from Commandlinefu explained. As a Web site recommended by the user as the most useful shell command, it records tens of thousands of shell commands, some of

http://fhqdddddd.blog.163.com/blog/static/186991542012417104144188/ EchoUse the echo command to display a line of text or a variable, or to enter a string into a file. Its general form is:echo stringThe echo command has many features, the most

Using the Linux shell is my daily basic work, but I often forget some useful shell commands and L tips. Of course, I can remember the order, but I'm not sure I can remember how to use it to perform a particular task. So I began to record these

The company does not have fixed IP, need to test the third party asynchronous callback interface (third party server How to find the company intranet machine); Baidu Search for "intranet penetration" results are mostly peanut shells, but this

Today, there is a problem that needs to be judged whether there is a. c file in the directory. I used the IF [-f *.c], using the-F and wildcard characters to determine if there is a. c file, while Linux always complains "unexpected operator", so

 If you are not familiar with the Linux shell array, see an article: Linux Shell array Building and use techniques , this article is mainly about the dynamic generation of array series. There should be a lot of methods here, I mainly take a sum

1, Documents: 1.1, the file access to 3 kinds of ways: 1 read (show file contents), 2 write (edit, delete, modify permission), 3 execute (Run shell script, program, etc. executable files). 1.2, the file can be divided into 3 kinds of permissions:

Creating a table Create ' test1 ', ' lf ', ' SF ' Lf:column family of LONG values (binary value)--Sf:column family of STRING values imports According to put ' test1 ', ' user1|ts1 ', ' sf:c1 ', ' sku1 ' put ' test1 ', ' user1|ts2 ', ' sf:c1 ', '

1. Peanut Shell The purpose of peanut shells is to apply for a free domain name. The application method is very simple, is to download a peanut Shell client, register a peanut shell account, and then you will get a free domain name. My account name

Reproduced from: http://changyang319.com/archives/2234 NO-IP is an established free Internet domain name provider, and if you've ever had a friend using an active IP stand, you should be impressed by how NO-IP can update the domain name IP through

In the shell programming process, you often encounter problems getting file names and file suffix names. The general processing methods are as follows: #code file= "Thisfile.txt" echo "filename:${file%.*}" echo "extension:${file##*.} "

CMD1 && cmd2 If the command cmd1 result status 0, the CMD2 is executed, otherwise the CMD2 command is not executed. cmd1 | | CMD2 if the command cmd1 result status 1, the CMD2 is executed, otherwise the CMD2 command is not executed. can be used for

A program that often needs help explaining. The ways to activate help instructions are described in two ways 1. The simplest way is to discriminate by the number of parameters. For example, displays the help description without any parameters. 2.

Http://blog.zol.com.cn/2322/article_2321763.html $ () and ' (anti-quote) In the bash shell, $ () and "(anti-quote) are used for command substitution. The so-called command substitution is similar to the variable substitution we learned in the fifth

See if the script syntax has errors:Bash-n modify_suffix.shTrack executionSh-x modify_suffix.sh AAA1.${var} 2.$ (cmd) 3. () and {} 4.${var:-string},${var:+string},${var:=string},${var:?string} 5.$ ((exp)) 6.$ (Var%pattern), $ (var%%pattern), $

1. Process ControlShell script is a procedural programming language, the process of programming language is divided into three types of execution, namely sequential execution, select execution, loop execution, these three execution methods to build

Purpose: To determine whether a file (test.gz.txt) suffix is a zipCorrect command: if [[${filename} =~ ^test.*zip$]]Here are a few things to keep in mind: use [[]] for its related usage see link 1; =~ is connected, I am in use, did not pay

Function: Quickly and automatically generate keys and bulk push to remote host, suitable for batch push key for ansible environment#!/bin/bashkeypath=/root/.sshiplist=/root/ip.txt[[ -e ${iplist} ]] && > ${iplist}for i in `seq 81 91`do echo -E "192.

Words do not say much, directly on the format:function formats in the Linux shell:function Myfunc () {Action[Return int;]}Among them, the individual thinks function and () are all functions of the flag, if you do not need to pass parameters , choose

In general, we are the most common command for copying data on the same server is CP, which can be used if you want to copy between different servers.Now there are two servers, you need to migrate the files on the a server to B server, because the