Linux

-----------Crontab Scheduled Tasks----------------------Check if the Crontab tool is installed crontab-l Check if the crontab service is starting services Crond status writes the current time to Log.txt per minute on the log file crontab-e*/1* * * *

First, Introduction NetCat, a "Swiss Army Knife" in Web tools, has a version of Windows and Linux. Because it is short and short (the 1.84 version is 25k, the old version or the reduced version is even smaller), functional, is designed as a simple,

First, Introduction Ifconfig is a tool that Linux systems use to obtain and modify network interface configuration information. Note: The NIC information configured with the Ifconfig command does not exist after the machine restarts after the

The leader asked the script to run for a long time in the background of the system, so the last script was modified and the daemon was added. My script is as follows:#!/bin/bashecho "Start"Url= "http://127.0.0.1:8080/"Curlit (){#echo

The first thing we need to know is that in the Linux kernel, the individual byte-order definitions are different in different CPUs.The Linux kernel version used for this analysis is: linux--3.0.0-12.Arch/xxx/include/asm/byteorder.h: byte-order

sudo find/etc-size +1m-exec echo {} \; #在 files with files larger than 1M in the/etc directory are displayed, and the files are separated by line breaks. sudo find/etc-size +1m | Xargs echo# achieves the same functionality as-exec but finds files

I. Interpretation of time-slice rotation scheduling codeThe code structure consists mainly of three files:1.mypcb.h2.myinterrupt.c3.mymain.c1. Process Control block (mypcb.h)/*cpu-specific State of this task*/structthread{unsignedLongip//EIP,

Sed is a good file processing tool, itself is a pipe command, mainly in the behavior of the unit processing, you can replace the data rows, delete, add, select and other specific work, the following first understand the use of SEDThe SED command

1. System calls are required from user space to kernel space2. The system call is implemented via the SWI instruction, at which point a parameter is stored in the R7 register to specify the kernel function to invoke.3. The actual functions of the

This section mainly refers to the Linux data type, mainly to facilitate understanding of the next big-endian, small byte sequence definition of the source code.First, take a look at Include/linux/types.h source code:----------------------------------

Ln-s source target Establish symbolic linkHistory 5 shows the 5 most recently used commands!5 perform a command with a history number of 5Date Mmddhhmmccyy. SS [Day and Day of the month are divided annually. seconds seconds]Cal 4 2015 View calendar

Test kernel and User Switching overhead, kernel switching overhead The fuse File System has been developed recently. The function of this file system is implemented in the user mode. However, its file system operation interface must be registered

Linux-Common commands (4) compression and decompression commands Compressed and decompressed command: gzip Command name: gzip Command: GNU zip Command path strength:/bin/gzip Execution permission: All Users Function Description: compress a

Use shell for mathematical operations You can use let, (), and [] to perform basic arithmetic operations. Advanced Operations use bc more efficiently. Let's look at the code and make the output clear.Let [Zhengweiwu ~] $ No1 = 4 [zhengweiwu ~] $ No2

As a DBA, you must learn 11 basic Linux commands that will not die Most databases run on Linux and UNIX platforms. As the computing power of the X86 platform approaches or even exceeds that of minicomputers, and with the tide of IOE removal, more

Getting started with cloud computing: pillar of saltstackGetting started with cloud computing: pillar of saltstack  View pillar data:   # salt '*' pillar.itemsThe default root directory of pillar is/srv/pillar. You can change the configuration

Linux-related decompression commands and linux decompression commands ZIP We can use the following command to compress a directory: # Zip-r archive_name.zip directory_to_compress Below is a zip file: # Unzip archive_name.zip TAR Tar is a widely used

Install VMwareTools in Ubuntu12.04 Because it is a Linux system and also the same as Debian, the installation of VMware Tools in Ubuntu12.04 is similar to that in [Linux] installing VMware Tools In Debian (click to open the link, however, installing

A small practice of linux network settingsSome time ago, I also learned a lot of Network-related knowledge and passed various practices. But never start from scratch. I will try it out in a letter today. The following are detailed records of this

Xshell connection to ubuntu 1. log on to a common user and enter root. Sudo-s (Enter the password of a common user) 2. Enable the SSH service. If it is not enabled, install openssh-server: Sudo apt-get install openssh-server (Select "y" for