unix egrep

Advanced Programming in the UNIX Environment (third edition) is a well-known programming book for Unix systems.However, the code example in the book, in order to correctly compile the run, you need to prepare the work:1. Download the source codePortal: http://apuebook.com/code3e.html2. Extracting source codeTar XF src.3e.tar.gz3. Install Libbsd-devel, otherwise compile the wrong returnYum Install Libbsd-de

Http://tool.chinaz.com/Tools/unixtime.aspx now the Unix timestamp (Unix timestamp) is1440732364Unix Timestamp (Unix timestamp) → Beijing Time →unix timestamp (Unix timestamp) How do I get the current UNIX timestamp (

JS gets the Unix time stamp The Unix timestamp (Unix timestamp), or Unix time (Unix times), POSIX time (POSIX times), is a time representation, defined as the total number of seconds from GMT January 01, 1970 00:00 00 seconds to the present.

Simple UNIX-prepaster and unix-based prepasterIn Linux, the current process scheduling algorithm is the CFS algorithm, which replaces the previous time slice rotation scheduling algorithm. The CFS algorithm smooths the dynamic priority calculation process, this allows the entire system to be preemptible by any execution entity at any time. In fact, this is the basic principle of the time-sharing system. Ima

Chapter 23rd UNIX File SystemNamed pipe Mkfifo:mkfifo [-M mode] pipe. Named pipes must be created explicitly and will not disappear (the RM command can be removed).The proc file is a pseudo-file used to access kernel information. For example, if a process ID is 1952, the process-related information can be found in a file in the/proc/1952 directory.The VFS (virtual file system) implements the details of file processing.24th Directory Operations~ Repres

1:unix file Type-3 typesNormal files (regular files): Text files (plain text, scripts, source programs, configuration files, HTML, etc.), binary files (multimedia files, databases, etc.)Directories: for organizing filesPseudo-file: does not store data for the purpose of providing a service. Divided into three kinds:Special files: Device drivers, file representations of physical devices (keyboards, monitors, etc.)Named pipes: Directing the output of on

UNIX, Linux, BSD-Unix, and MACOs are all computer operating systems. The earliest Unix was developed in 1973 by Dennis Ritchie at the Bell Laboratory of att, which was all written in C language.After the successful development of the original UNIX, people thought it was very useful. As a result, two major branches e

Often people ask what is the difference between "linux and UNIX? ","linux is UNIX? 」。The answer is generally "linux is a Unix-like development of Os","linux and Unix similar but not a os".There are some stories about "linux and unix".First, "

I recently studied Unix programming art. The first chapter is very good. It tells us a lot about the history and philosophical basis of Unix. The most important part is the 17 design principles mentioned. I know many principles, but I have never summarized them in such detail. Most of the content below comes from the book "Unix programming art", which is a small

UNIX domain sockets are used to communicate between processes running on the same machine.UNIX domain sockets provide both stream and datagram interfaces. Create a pair of non-named, interconnected UNIX domain sockets. Socketpair1. Naming unix domain sockets1) Socket address format, under Linux as shown in struct Sockaddr_un {sa_family_t sun_family; char sun_path

1, in the linux bash Beijing time and Unix time stamp mutual transfer: Get UNIX Timestamp: Command: Date "+%s" Output: 1372654714 Get Beijing Time: Command: Date ' +%y-%m-%d%h:%m:%s ' Output: 2013-07-01 12:55:56 Unix timestamp transfer to Beijing time: Command: Date [email protected] ' +%y-%m-%d%h:%m:%s ' Output: 2013-07-01 12:58:34

Introduction to advanced programming in Unix environment: Basic Unix knowledge (III) Some shame ~, I haven't updated it for a year and a half. I came to a new organization and made an embedded system as I expected. I thought it was okay;This time, I continue with the advanced programming series for the unix environment, hoping to stick to it :)1. programs and pro

Apue unix environment programming, unix environment programming Today, we have finally finished reading all the first 17 chapters of APUE. Basically, the main knowledge is in these chapters. After reading the "unix/linux Programming Practice tutorial", I felt very open and relaxed. At the code level, I learned many linux system mechanisms and never understood pro

Level: Intermediate By Michael Stutz From: IBM developerworks China Link: http://www.ibm.com/developerworks/cn/aix/library/au-badunixhabits.html When you often use a system, it is often in a fixed usage mode. Sometimes, you do not get into the habit of doing things in the best way possible. Sometimes, your bad habits may even lead to confusion. One of the best ways to correct such defects is to consciously adopt the good habits of resisting these bad habits. This article presents 10

UNIX advanced environment programming (13) signal, unix programming 13 Signal The signal is Soft Interrupt. Signals provide an asynchronous way to process events. For example, you can press the End Process key on the terminal to terminate a process in advance. 1. Concept of Signal Each signal has a name whose names are headers with SIG. For example, every time a process calls the abort function, a SIGABRT s