Linux Platform x86 compilation (10): integer arithmetic

"Copyright Notice: respect for the original, reproduced please retain the source: blog.csdn.net/shallnet, the article only for learning Exchange, do not use for commercial purposes"This section describes how to use integer arithmetic in the language,

Linux variable Operation record

Variable Operation Summary:${var:-value} variable Var is unset or null to output Value. A value that outputs the var value of the variable.${var:=value} variable var is unset or null to output value and is assigned to variable var.

Linux:lsof command

Lsof is the abbreviation for List open files, on Linux and other Unix, and on Mac XosView open files/directories and corresponding processes command-line string pid process iduser user fd TXT (process program

Linux Common Command Daquan

System Information The processor architecture of the Arch Display Machine (1) UNAME-M display the processor architecture of the Machine (2) uname-r display the kernel version dmidecode-q display hardware system parts-(SMBIOS/DMI) hdparm-i/dev/ HDA

Linux disk and file system management

DF DF (disk free)function Description:Displays information about the disk.Syntax:DF [-ahhiklmpt][--block-size=][-t ][-x ][--help][--no-sync][--sync][-- version][file or device]Additional notes:DF Displays the disk's file system and usage

Linux-vi Editor 3

1. Open File> VI file//This mode is command mode2. Tail-line mode operation>: Q//This mode is "tail line mode">: w//Save the modified document>: wq//Save and exit>: q!//forcibly quits without saving changes>:/content//To find the specified content, "

The Linux learning Note 9--touch command is used

NAMETouch-change file Timestamps--changing the time History of filesSynopsisTouch [OPTION] ... FILE ...DESCRIPTIONUpdate the access and modification times of each FILE to the currentTime. --Use the touch command to change the date and time of a file

Ways to set up and view environment variables in Linux

1. Display environment variables HOME$ echo $HOME/home/redbooks2. Set a new environment variable Hello$ export hello= "hello!"$ echo $HELLOHello!3. use the env command to display all environment variables$

Linux Driver design compilation error message collection

1, warning:passing argument 2 of ' REQUEST_IRQ ' from incompatible pointer typeHttp://blog.sina.com.cn/s/blog_7321be1101012gek.html warning:passing argument 2 of ' REQUEST_IRQ ' from incompatible pointer type my request The _IRQ function is

Linux Common commands

Linux Common Command DaquanSystem Information The processor architecture of the Arch Display Machine (1) UNAME-M display the processor architecture of the Machine (2) uname-r display the kernel version dmidecode-q display hardware system

0 Copy technology in Linux, part 1th

OverviewThis series consists of two articles, which describe several 0 copy technologies currently used on the Linux operating system, and simply describes the implementation of various 0 copy technologies, as well as their characteristics and

How to use CP and SCP commands in Linux

Transferred from: http://www.jb51.net/LINUXjishu/70474.htmlLinux provides us with two commands for file copy, one for CP and one for SCP, but they are slightly different.CP---mostly used to copy files between different directories on the same

Linux time command parameters and usage details--linux Test command Execution times command

" command " Time-executes the command and timings"Format" time [-p] command [arguments ...]DescriptionExecute command line "command [arguments]", when the command line execution finishes printing in standard output, the time statistic results of

Linux Growth path (Makefile Quick Start)

Jeremy LinI think, for a lot of coder like me who use widows systems for a long time, I probably don't know what makefile is. Because the IDE in widows (like VS) is doing the work for you silently, but when you enter the Unix/linux system, that

The Linux OpenSSL tool creates a private CA

Certificate creation depends on the encryption algorithm, see http://yunweigou.blog.51cto.com/6299641/1637108 Preface, with the development of the network, because the use of HTTP protocol communication between the two sides of the data is clear-

How the Linux kernel analyzes how the operating system works

How the Linux kernel analyzes how the operating system works20122137 Sha Yu JiOriginal works reproduced please indicate the sourceLinux kernel Analysis MOOC course http://mooc.study.163.com/course/USTC-10000290001. Content DescriptionThe inline

Makefile writing and Automake finishing of Linux

Makefile Writing RulesIn a makefile, it usually contains the following content:1 The target object, usually the target file or executable file, that needs to be created by the Make tool2 files that are dependent on the target body to be created

Linux basic awk simple to use

awk Basic usage:awk [Options] ' program ' file1 file2program:pattern{ACTION STATEMENT} is made up of statements, and the statement delimiter is a semicolonAction:print, printfoption:-F: Indicates the input field delimiter-V var=value: variable

Linux under LNMP Environment installation notes

1 Installing NginxInstalling the sudo apt-get install NginxStart Service Nginx StartThe browser tests whether the installation was successful http://192.168.2.173/2 Installing PHP5sudo apt-get install PHP5-FPM3 Installing the MySQL 5 databasesudo

Gettimeofday () Get system time, accurate to microseconds this seems to only work under Linux, not under Windows

struct timeval{ longint/ s number of the same time (NULL) return value long int // microsecond number 10 of 6 times };1 struct timezone{2 int tz_minuteswest; /* Time difference between GMT and West */ 3 int tz_dsttime; /* How to

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