unix book

Java Time Javascript Math. Round (new date (). gettime ()/1000)The unit of the value returned by gettime () is millisecond. Microsoft. NET/C # Epoch = (datetime. Now. touniversaltime (). ticks-621355968000000000)/10000000 MySQL Select unix_timestamp (now ()) Perl Time PHP Time () PostgreSQL Select extract (epoch from now ()) Python Import time first and then time. Time () Ruby Obtain

[Test Tool] a tool that converts Unix time to general time. The test tool is unix. A tool for converting Unix time to general timeDemo effect: Click convert: Source code: Function calctime2 () {var time = invalid argument Doc ument. getElementById ("inpTime "). value; if (time = "") {alert ("time is blank, enter"); return;} if (isDigit (time) = false) {alert ("t

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

1. Configuration Apue. H is a file written by the author. It contains common header files and is not provided by the system. This includes common header files and definitions of error handling functions. It is really convenient to use. To use it, perform the following operations to complete the configuration. Download the compressed src.tar.gzsource code package at http://www.apuebook.com. 1. decompress the package to the/home/user/directory. 2. Modify wkdir =/home/XXX/apue.2e in make. Define

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

"Unix environment advanced programming" chapter 3rd-file I/O, unix environment Advanced Programming1. Introduction For most Unix files, I/O only requires five functions: open, read, write, lseek, and close. The functions described in this chapter are often calledI/O without buffering. TermsWithout BufferingIt means that the user's process will not automaticall

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 Network Programming] basic TCP socket programming and unix Network Programming The concurrent server described in this chapter is a single customer Process Model Implemented by fork. The following is the socket function of the basic TCP client/server program (the schedule of some typical events ): TCP status transition diagram: 1. socket functions: # Include Family: protocol family (AF_INET, AF_