Linux One-click Optimization (for Redhat and derivative versions)

#!/bin/bash#set envExport lang= "en_US. UTF-8 "Export path= $PATH:/bin/sbin:/usr/sbin#whether ROOT to running userif [[$ (WhoAmI)! = root]];thenecho "Please su-root run the script."FiService= ' which service 'chkconfig= ' which chkconfig '.

Analysis of the connection queue backlog for Linux socket


Linux in the socket connection queue definition processing on the personal feel is a little pit dad, gossip less, direct talk.To establish the socket connection process:1.client sends a SYN request to the server2.server received after the request is

The meaning of the command label in Linux Manual

If you look at the Linux manual (for example, execute: Man Open), you will find that there are expressions in the document: Read (2), write (2), Lseek (2), Fcntl (2), and so on, what does the numeric expression in parentheses mean?You can get the

View the number of files and directories under Linux

View the number of files and directories under Linux1. View the total number of current files and directories (excluding subdirectories):Ls-l | Wc-l2. View the number of files in the current directory (excluding subdirectories):Ls-l |grep "^-" |wc-l=

Linux Ftok () function--shared memory of multi-process IPC

An ID value must be specified when the system establishes an IPC communication (such as Message Queuing, shared memory). Typically, this ID value is obtained through the Ftok function.The Ftok prototype is as follows:key_t Ftok (char * fname, int id)

Linux kernel concurrency Scenarios

Through the basic concept of Linux kernel concurrency, we have seen that for concurrent access to shared resources, resulting in inconsistent results with the expected results are not allowed by software designers. We know that we write a software

Linux Multi-task programming: fork () function and its basic experiment

Source: CSDN Wang Wensong transferred from Linux communeFork () functionThe only way to create a new process in Linux is to use the fork () function. The fork () function is a very important function in the Linux system, and the functions we have

Beginner must See, Linux Learning Basics

Linux Learning Basics1. What is Linux?Accurately speaking, refers to the Linux kernel (core program of the system), its core copyright belongs to Linus Torvalds, under the GPL (GNU general public License) under the Copyright agreement, anyone can

Introduction to Linux interprocess communication (IPC)

development of the Linux IPCThe process communication methods under Linux are basically inherited from the process communication methods on the UNIX platform. The two main players at T - Lab and BSD(UC Berkeley's Berkeley Software Release Center),

Linux common Commands (3)-File and directory management

(1), Linux file permissions and directory configurationLinux files are divided into three identities: owner, group, others. Three permissions read, write, execute#ls-alDrwxr-xr-x 1 root root 4230 2012-09-12 17:21 jdk-7u7Corresponding file

Linux Build User Details

Create a new userModify the user's personal settingsPermission settings for the file directoryTwo important documents:passwd and Group Create a new userSetting up a new user consists of two steps, the first step is to use the Useradd command to

Linux runtime not loaded on dynamic library workaround


1. Connect and run-time library file search path to Settings library files are used when connecting (static libraries and shared libraries) and running (limited to programs that use shared libraries), and their search paths are set in the

Linux tips: Use screen to manage your remote sessions

Do you often need SSH or telent telnet to a Linux server? Do you often have headaches for long-running tasks such as system backups, FTP transfers, and so on. Usually we open a remote terminal window for each of these tasks because they take too

Z Linux Less/more and Head/tail commands

The purpose of the cat command is to connect files or standard input and print.1. Display the entire file at once: Cat filename2. Create a file from the keyboard: cat > FileName can only create new files and cannot edit existing files.3. Merge

Linux pipelines (named FIFO)

OverviewOne limitation of (anonymous) pipeline applications is that they can only communicate between processes that have a common ancestor (affinity).If we want to exchange data between unrelated processes , you can do this with a FIFO file, which

"Linux Notes" detail the naming conventions and usage methods of shared libraries under Linux system

1. The benefits of the Shared libraryA shared library, also known as a dynamic library or so file, can be called when the executable file is started or when the process runs. There are many benefits to using shared libraries, such as (including but

The uname of Linux commands

Uname is the command that queries the basic information of the system in Linux.Command form: uname [Options]Options include: (if not with any option: The default-S option)-S,--kernel-name output kernel name-N,--nodename the host name on the output

A detailed description of the awk command for Linux

Brief introductionAwk is a powerful text analysis tool, with the search for grep and the editing of SED, which is especially powerful when it comes to analyzing data and generating reports. To put it simply, awk reads the file line-by-row, using

Linux basic knowledge "turn"

LinuxDirectory Schema/root directory/bin common commands for binary file/boot files that must be read when the system is started, including the core (kernel)/boot/grub/menu.lst Grub Settings/boot/vmlinuz kernel/BOOT/INITRD Core compression Required

Common commands for the Linux command line

1. Download command wgetWget-c Http://the.url.of/incomplete/fileC support for the continuation of the breakpoint-S,--server-response print server response.--hlep View additional Help2. Load and unload Query Package commandRpm-qa | grep tomcat4 to

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