Linux

①?tar commandUnpacking: Tar zxvf Filename.tarPackage: Tar czvf filename.tar DirName***************************************************************************************②? GZ command unzip 1:gunzip filename.gz unzip 2:gzip-d filename.gz

When learning Io, we have used the file IO function, the standard IO function has implemented a copy of the file,When copying a file, we can consider several ways:A. Single Process copy:Assuming that a file requires a copy of 100 bytes, each time

The command MV for renaming files or folders under Linux can be renamed, and files or folders can be moved.Example: Renaming directory A to BMV A BExample: Move the/a directory to/b and rename to Cmv/a/b/cIn fact, in the text mode to rename the file

First, the system time1. Viewing the system time[Email protected] ~]# datetue Dec 5 16:06:18 CST 20172. Set the system time[[email protected] ~]# date-s 2017/12/5[[email protected] ~]# date-s 16:03:30Second, hardware time1. View Hardware time[Email

Setup of virtual memory for Linux (Ubuntu)Swap space is virtual memory, which is of great use when physical memory is low.View memory Size: free-m//M indicates the displayed byte unit is m (megabytes)Let's add the Swap size to the system.

1. Expression#!/bin/bash#if test expression 1 "expression is true"ifTest 1 = = 1And then Echo ' test condition is true ' fi#if test expression 1 "equals" if [expression 1]if[1 = = 1];then echo ' [] condition is true ' fi#if test! expression 1

--Previous time items on the busy, period notes are temporary existence of local txt, these days a little time, sorting out, so that later to view;Linux View memory Usage:Free-mTo release the

Database is on the Linux server, you need to import a DMP using the IMPDP method, with the root user login to the database server, the direct use of the IMPDP command to perform the import operation, prompt: KSH:impdp:not found. After checking that

1. Find the location of the discLs-l/dev |grep cdromMount/dev/sr0/mnt[[email protected]/]# ls-l/dev |grep cdromlrwxrwxrwx 1 root root 3 Dec 4 03:17 cdrom2-SR0CRW-RW----1 roo T cdrom , 1 Dec 4 03:17 SG1BRW-RW----1 root cdrom one ,

1. Get the K line (take k=10 as an example)Note that if the file contains less than 10 rows, it should not be output.# Read from thefile file. txt and output the tenth line to stdout.# solution one, using awkawk 'NR = = Ten' file. txt# solution Two,

Linux file operationsThere are many ways to operate Linux files, here are the following two kinds of Package, archive, command for files: tar,gzip,bzip2 Edit the contents of the file with the VI editor (VIM is an extension of the VI editor)

IntroducedSometimes we need to open multiple programs at the command line at the same time, but each program will occupy the command line, when you can use Tmux, to the command line interface columns.InstallationYou only need one line of commandapt

IntroductionThe top command is a common performance analysis tool under Linux that shows the resource usage of individual processes in the system in real time, similar to the Task Manager for Windows.Top display system current process and other

The tomcat port number and process under Linux1. View the Tomcat process:Ps-aux | grep tomcat (or Ps-ef | grep Tomcat is OK)You can see that there are now two Tomcat processes running, one with a PID of 9974 and another PID of 23422.2, view the port

The 17th Chapter equipment and module one, equipment type 1. Linux and UNIX systems:Block devicesCharacter deviceNetwork equipment2. Block Device:Usually abbreviated as BLKDEV, it is addressable, in blocks, block sizes vary by device, and block

The first two articles describe the basics of multithreaded programming in a Linux environment, as well as a typical example. This article mainly compares the Linux environment and the Windows environment of multi-threaded programming

Communication between Linux processes:This paper mainly discusses the signal problem.As mentioned in the process and thread (a) under Linux, the Scheduler can dispatch the process in an interrupted manner.However, how does the process know that it

Linux Network Management-remote logon tools and linux Network Management       1. symmetric encryptionExample: compress the file and add a password. If someone else wants to open the file, they only need to know your password. This method is not

Memcached cache database application practices, memcached Cache1.1 database comparison Cache:Store data in the memory. cache is enabled only when the disk is not competent. Disadvantages: power-off data loss (dual-power), the purpose of using cache

Install the svn server in Linux.Preface You are responsible for the project, set up a version control library, and use linux to set up the SVN version controller as the company's project version control library. No nonsense. Go to the topic directly: