First, the signalThe signal is used to notify the process that an asynchronous event has occurred. The kernel can also send a signal to the process because of an internal event, notifying the process that an event has occurred. Note that the signal

Linux command (IN): Watch command

Watch is a very useful command, basically all Linux distributions with this gadget, like the name, watch can help you monitor the results of a command, save you to manually run over and over again. Under Linux, watch is the periodic execution of the

Linux directories and Permissions

1. Rmdir-p is used to delete a list of directories, such as Rmdir-p/TMP/TEST/1/2/3 if/tmp/1/2/below in addition to the 3 directory has a 4 directory, 4 directory also has a 5 directory, then whether it can be successfully deleted? Rmdir-p the error

Linux/unix File manipulation functions

This article is used to record common file manipulation functions in Linux programming, including system calls and library functions, for review.One problem with direct use of the underlying system calls for input and output operations is that they

Linux modified the file when the crash, produced a. swap file, how to fix it?

Sometimes when you open a file with Vim, you are prompted with information similar to the following:E325: noteDiscovery Interchange File ". Exportcert.cpp.swp"Owner: Liuchuanliang Date: Thu Mar 1 17:15:41 2012File name:

A summary of the management of Linux system in the notes of Brother Yun-Wan (I.)

Question One,Create a new user Xuetong, with the user login error is as follows:[Email protected] ~]# Su-xuetongId:cannot find name for user ID 504Id:cannot find name for group ID 504Id:cannot find name for user ID 504[I have no [email protected] ~]$

Little talk process: Write Linux daemon method

Guardian Process OverviewThe daemon, which is commonly referred to as the daemon process, is a background service process in Linux.It is a long-lived process, usually independent of the control terminal and periodically performs some sort of task or

Frequently asked questions in Linux compilation

frequently asked questions in Linux compilationError TIP: makefile:2: * * * missing delimiter. Stop it.Reason makefile missing a tab separator before GCC statementError hint: bash:./makefile: Insufficient permissionsThe reason makefile is that the

Linux file Security and permissions

FileFile typeCreate a fileChange permission bitSymbol modeR W x: File owner Permission This is the previous three bitsR-x: Same group of user rights This is the middle three bitsR-x: Other user rights This is the last three bitsThe general format of

Getting Started with Linux package management basics

Most modern Unix-like operating systems provide a centralized package management mechanism to help users search, install, and manage software. Software is usually stored in the form of "package" in the warehouse "repository", the use and management

REDMINE_DMSF Summary of installing plugins in Linux under Bitnami-redmine

Installation Plugin REDMINE_DMSF Summary Background Environment Linux system version Redmine version DMSF plugin Version installation process Installing Redmine Installing the DMSF

Understand the load average (graphics) in the Linux system

One, what is load average?The load on the Linux system is a measure of the current CPU workload (wikipedia:the system load is a measure of the amount of work, a computer system is doing). It is also simple to say the length of the process queue.Load

Linux TCP queue-related parameters summary turn


In the performance optimization of network applications on Linux, TCP-related kernel parameters are generally adjusted, especially the parameters related to buffering and queuing. The articles on the Internet will tell you what parameters you need

RedHat Linux 7.2 Introduction and Installation

1.RedHat Linux7.2 IntroductionRed Hat Company officially released the Enterprise Linux 7 version on June 11, 2014, which has been made available in bare servers, virtual machines, IaaS, PAAs, etc.Strengthen, rely on, and more powerful data center

Linux kernel parameter diagram of Contents 1. Vmlinuz 2. TCP IO 2.

Linux memory Management--Actual allocation function Buffered_rmqueue

Whether the allocation is fast or slow, the actual allocation of memory is the Buffered_rmqueue () function, the other is to choose from where to allocate more appropriate;Let's talk about each parameter first:The struct zone *preferred_zone

Rsync for the Linux Data Sync Backup tool

First, rsync basic configuration and introduction1. What is rsync?rsync (rsync-a Fast, Versatile (general), remote (and local) file-copying tool An open source, fast, versatile tool that enables full and incremental simultaneous local or remote

Time, latency (Linux device drivers)

Time delayHow to measure the time difference, compare timesHow to get the current timeHow to defer an operation for a specified period of timeHow to schedule an asynchronous function to execute after a specified timeMeasure time DifferenceThe kernel

How to view Linux OS versions

Two. To view the Linux version:1) Log in to the server to perform lsb_release-a and list all version information, for example:[Email Protected]_sys ~]# lsb_release-aLSB Version::

Linux Threads: Synchronization and Mutex

First, let's take a look at what synchronization is:In fact, the so-called synchronization, is the issue of a function call, before the result is not obtained, the call will not return, while other threads can not call this method. By this

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