Shell

Today to optimize the company's new deployment servers, found that the TTY terminal has 6, in order to save a bit of memory, decided to leave only a TTY terminal, the others are off, but CENTOS6 and centos5 terminal closure method completely changed,

This script has been tested on the Ubuntu and CentOS versions, and the script is as follows: Copy Code code as follows: #!/bin/bash Line= ' =========== ' #linux发行版名称if [[-f/usr/bin/lsb_release]]; Thenos=$ (/usr/bin/lsb_release-a

Customer requirements, do not want to allow foreign IP to access the server, would have to let the computer room in the upper route to solve, but those people do not bird you!!! ~~~~In this case, you can only use iptables to solve the ~~~~~~~~~About

Components used to query IP addresses Copy Code code as follows: wget http://rfyiamcool.googlecode.com/files/nali-0.1.tar.gz Tar zxvf nali-0.1.tar.gz CD nali-0.1 ./configure && make && make install The steps and Nginx are

Parameters:Pathname, the path file name of the temporary file is stored, and the manual free () is required.Dir, the path to the temporary file, if the TMPDIR environment variable is not empty, this parameter is ignored and the environment variable

1, look at the machine installed which shell? There are two ways to view it. First type: [Rocrocket@wupengchong ~]$ Chsh-l/bin/sh/bin/bash/sbin/nologin/bin/zsh The second type: [Rocrocket@wupengchong ~]$

Case statements in the shell:You can match the contents of a variable with multiple templates, and then decide which part of the code should be executed based on a successful matching template. Use format:Case matching Parent board inTemplate 1 [|

One, logical operators Logical Volume Label Express meaning 1. About the files and directories of the detection of logical labels! -F Common! Detect the existence of "archives" eg:if [-f filename]

Why should I include a header file instead of a. c file Test code: Copy Code code as follows: M.C file: #include "t.c" int main () { Test (); return 0; } Compile: Copy Code code as follows: GCC M.

Copy Code code as follows: #!/bin/bash function Pinghost { Ping $1-c 1-w |grep rtt|cut-d "/"-f6 } Tmp_fifofile= "/tmp/$.fifo" # script runs the current process ID number as filename Mkfifo $tmp _fifofile # Create a new random FIFO pipeline

1. List all directory usage and sort by size. Copy Code code as follows: Ls|xargs Du-h|sort-rn #不递归下级目录使用du-sh 2. View the file exclusion with the # switch and blank line, suitable for viewing the configuration file. Copy

Nodejs is really very hot, before the past, but never seriously recorded anything. Build its development environment under Ubuntu Try a quick, easy way to get the system to automatically help you install what you need, and we'll generate a shell

Today suddenly think of a problem has not hands-on practice, is the use of Shell batch modification file suffix, now hands-on practice. Requirements: The home directory has some SQL files, want to bulk renamed into TXT 1, find + xargs +sed

Array as a data structure, in some high-level languages are directly provided and implemented, of course, my shell is also some ha. PS: This article is written because brother B in the group sent a screenshot: My big B elder brother is still

The recent systematic study of the shell function, the overall sense of the root of the other language function is similar, but it also has its own characteristics One, the call function must be defined after the function, or it will be the error

When you write a shell script on a Linux operating system, we use the $ symbol in front of the variable to get the value of the variable, usually in the script using the "$param" in a double quote format, but there are also the use of the ' $param '

#!/bin/bash # Daily BACKUP log file log_path= "/home/fdipzone/logs" # Log directory Backup_path= "/home/fdipzone/logs/bak" # Backup directory ex PIRE=30 # Backup file only retains 30 days function backup () {if [-d ' $log _path] && [d] $backup _

[grep Introduction:] grep is used to filter rows that contain specific characters, and to use regular expressions to search for text that is selected in positive behavior units when looking up a string in the data. Usage: grep [Cinvs] ' pattern '

Case ... Esac is similar to the switch ... case statement in other languages, and is a multi-branch selection structure.The case statement matches a value or a pattern, and if the match succeeds, the matching command is executed. The case statement

What is a shell, what can you do?1. ProceduresNarrow: Operating system programs and applications.The operating system program is used to invoke the monitoring kernel, which runs all the programs we can apply on this operating system.The operation of