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please explain below The whole line of code in the Shell script that starts with if, have you seen the application scenario ?if (kill-0 $pid 2>/dev/du11) then echo "Oldboy" Else echo "Oldgirl" fiInterview question: Please explain the meaning of if (kill-0 $pid 2>/dev/null) code?if (kill-0 $pid 2>/dev/null) then echo "Oldboy" Else echo "Oldgirl" fiThe old boy answers the main points: kill-0 $pid 0 means not to send any signal to the PID correspon

.txt b.txt data yum.log z.txt1.4 Say these special symbolic meanings: >> > 2> 2>> # (pound). (point): (two points)>>:1>>, append standard output redirect, do not erase content, add content to last line, >:1> standard output redirect, erase old content, add new content; 2>: Error output redirect; 2>>: error append output redirect; #:1) Note; 2) represents the root user;.:./, current directory;. ：.. /, the parent directory of the current directory;1.5 T

Just one command, parted.Normal hard disk is more than 2T timeYou can't use Fdisk partitioning.This is the time to use tool parted to partition the rows.Hard disk larger than 2T to use GPT format cannot use MBR#parted/DEV/SDC mklable GPT#parted/DEV/SDC Mkpart Primary 0 200#parted/DEV/SDC Mkpart Primary 201 400#parted/DEV/SDC Mkpart Primary 401 1000#parted/DEV/SDC P ViewFormatting after partitioning is complete#mkfs. Ext3-b 4096/DEV/SDC1#mkfs. Ext3-b 4096/DEV/SDC2#mkfs. Ext3-b 4096/DEV/SDC3Mount

those things, the system is the most basic library files, what is the use and so on.Then we can learn management systems, such as learning to configure a variety of network servers, using Linux to build networks, are learning Linux system Management and network management a good way. At this stage you can often check the information on the Internet, to see the Forum of the essence of the article, the Forum can let you learn some small knowledge, tips.6. go online to learn more, take its essence

files, etc.1, #! /bin/sh means that this script uses/bin/sh to interpret execution;2. The writing of several control statements in shell scripts:[Plain]View Plaincopyprint? While true; Do ... Done While True;do...done[Plain]View Plaincopyprint? For ... Do ... Done For ... Do...done[Plain]View Plaincopyprint? If Then Fi If ThenfiOther keywords and system commands literal meaning can be understoodAutomatic timing

The following is the old boy education compiled Python teaching materials, reproduced please indicate the source: http://www.oldboyedu.com?A python tuple is similar to a list, except that the elements of a tuple cannot be modified. That is, the data can be queried, but cannot be modified. So the slicing operation also applies to tuples.I. Defining tuples>>> tup = ("Python", "Chick", "Dapeng", "Mouse") When you include only one element in a tuple (), y

Interpreter path#!/usr/bin/env pythonPython2 need, Python3 no longer needed.The usage of input, waits forever until the user enters a value, assigns the input value to a thingVariable name-Alphabet-Digital-UnderlinePs:Number cannot startcannot be a keywordIt's best not to repeat the python built-in stuff.Conditional statementsIndent with 4 spacesPass generation means empty code, meaningless, just to represent a block of codePython old boy day09

')Print (v)Test = "ALEXALEXR"v = test.count (' ex ', 5,6)5,6 represents the start and end coordinates of a stringPrint (v)# What's the end of what?# Start with what?Test = "Alex"v = test.endswith (' ex ')v = test.startswith (' ex ')Print (v)#从开始往后找, after finding the first one, get its position> or >=Test = "Alexalex"# Not found-1v = test.find (' ex ')Print (v)# Index not found, error ignoredTest = "Alexalex"v = test.index (' 8 ')Print (v)# formatting, replacing placeholders in a string with th

1. Say this book, the explanation is very detailed, the content selection is enough to get started Django.2. Some points to note in studying this book:sudo pip3 install django==1.10.1sudo pip3 install Pytzsudo pip3 install Django-password-resetsudo pip3 install Redissudo pip3 install Markdownsudo pip3 install Pillowsudo pip3 install Sorl-thumbnailsudo pip3 install django-bracessudo pip3 install awesome-slugifyAgain, the source: If installed in The place where the underlying error is said>1 login

Bo Main development environment: Operating system: WINDOWS10 Memory Size: 8G Java version: Java-version "1.7.0_79" MyEclipse Version: MyEclipse 10 Before the development project well, recently took over a new project, SVN Import project, and then MyEclipse pop-up memory overflow, very depressed there is no. On the internet to find a lot of methods are useless!!! It's going to freak out!! Okay, memory overflow, right? Then modify the Myeclipse.ini: #utf8 (do not

installation of Rrdtool:Rrdtool-1.Rrdtool-devel-1.Rrdtool-perl-1.Database for data collection:Rrdtoll Create TEST.RRD--step 5--start-1ds:testds:gauge:8:0:u rra:averge:0.5:1:17280 rra:averge:.5:10:3456 rra:averge:.5:100:1210Create TEST.RRD: Creating--step 5: time S--start-1: When to start s default 10Ds:testds:gauge:8:0:u: Name: Type : maximum wait Time: Minimum number: Maximumrra:averge:0.5:1:17280: average: Find out how many marks are unknown: How much to save (5s a day can collect 86400 )Get D

the real-time is still very poor, the application may be 10ms after the response to a real-time task, so in order to achieve real-time application under Linux, you have to hit the Linux kernel idea, so rtlinux so dry, RTLinux is actually a patch to the kernel, like a trojan to the Linux kernel open the back door, before the Linux kernel to take over the system resources such as hardware interruption, and then according to their own will to allocate resources, can be distributed to the Linux ker

use, minimizing dependencies on external libraries so that more people can run them.Pyray InstallationPyray Library has been uploaded to PyPI and installed via PIP commandAlternatively, you can download the code and run the installation from the home folderIt is more convenient to install with PIP.Install third-party dependent librariesPIL, NumPy, and scipy are required, and matptlib and Syry are required if you are writing mathematical equation images using the methods in writeonimage.py.Using

This tutorial teaches triple friends to use PS to repair defaced old photos, the tutorial is difficult to medium, but the method mentioned in this tutorial is very practical, forwarded to the Triple learning PS photo post-processing of the friends to share the study, we first look at the original image and after the restoration of the comparison: Triple recommended: photoshop7.0 Mini version free download | Photoshop CS5 Chinese free Download | Photo

The old version of looking for a page more limited to through nicknames, mailboxes, MSN, micro-and other specific ways to find someone, and found people are familiar with you. Play microblogging for so long, do you feel that the basic people have been mutual powder, want to pass micro-Bo to meet new friends? The new version of someone for you to solve is this problem! Its main function is to find a new friend you are interested in and suitable for you

First look at the effect: Or the old saying: before we can achieve any effect, we have to make a concrete analysis of the final effect. Aging as one of the most common laws of nature, we are not unfamiliar. So what is the specific manifestation of aging in the portrait? We read the illustrations: We can see from the above a group of men and women in different age groups, the ma

A lot of users through win7/win8/win8.1 upgrade to the latest WIN10 system, and the use of upgraded installation WIN10 will be left in the C disk Windows.old backup, many users to delete the way to find Windows.old can not be deleted, Prompt for insufficient privileges requires system permission to operate, so how do we handle it? In fact, we do not need to delete this, the same in the WIN10 system with the Disk Cleanup tool, the use of cleaning tools to smooth out some of the

Network version 6.0 version relative to 5.0 in the function, module has a large change, so the original 5.0 Management Server, agent, protection terminals need to be redeployed. For example, in the 5.0.474 version, the following methods are: The Management Server upgrade step is roughly: Backup 5.0 Management Server-Uninstall 5.0 Management Server-Install 6.0 Management Server-Restore Management Server data-then generate a new 6.0 agent and Workstation antivirus program-Make a self-extracting p

password of the background users of the site too simplistic, to conform to 10 to 18-bit uppercase and lowercase letters + numbers + symbol combination.4. Site management path must not be used by default admin or Guanli or manage or file name is admin.asp path to access.5. The basic security settings of the server must be done in detail, the security policy of the port, the security of the Registry, the security of the underlying system, or the server is not secure, the site is no longer safe.Ho

Mepis magic with a set of environments suitable for old computers. Antix's goal is to provide a lightweight but fully functional, flexible, free operating system for Linux novices and veterans. It should run on most computers-a PII system from MB memory but with 128 MB swap partitions to the newest high-end machine. The minimum memory configuration recommended for Antix is 128 MB RAM, while Setup requires at least 1.2 GB of hard disk space. Antix can