vmworld 2015

: g/^$/d Delete blank line:%d delete all rows: g/^[0-9]*$/d Delete Only the number of rows if you want to change the file name of the file that is currently being edited, the workaround is to first use: F to Buffer name, and then delete the original file:: F New_file_name:!del # (# will be automatically replaced by VIM to the previous filename) here will be a command-line window, if you do not want to see it, the second command changed to:!start/b del # VIM format code: GG=G formatted full-text

to manage other users ' cron tasks, by default managing their own- L List , List Tasks- R Remove , remove All Tasks (note: Deleting a task should delete the row implementation via the edit interface)- e Edit , open the Edit Interface Definition Corn TaskCRONTAB-E-U USERNAMETopic:1, every Monday to Saturday 3:20 A.M., run the tar command to save the/etc/directory for archiving, storage location is/BACKUPS/ETC-YYYY-MM-DD.TAR.XZ[[Email protected] ~] #mkdir/backups/[[email protected] ~] #contab-E30

First, homework (exercise) content:1. Summarize the detailed usage method of the task plan (at, crontab) on Linux system;2, every Monday to Saturday 3:20 A.M., run the CP command to archive the/etc/directory, storage location is/BACKUPS/ETC-YYYY-MM-DD;3, every Sunday 2:30 A.M., run the CP command to backup the/etc/fstab file, the storage location is/BACKUP/FSTAB-YYYY-MM-DD-HH-MM-SS;4, every night 12 o'clock, get all the lines in the/proc/meminfo file starting with S or M, appended to the/statist

4th column represents the month 1~125th Column Identification Number Week 0~6 (0 = Sunday)6th List of commands to run 2, every Monday to Saturday 3:20 A.M., run the CP command to archive the/etc/directory, storage location is/BACKUPS/ETC-YYYY-MM-DD;[[email protected] ~]# CRONTAB-E20 3 * * 1-6/bin/cp-r/etc/backups/etc-$ (date ' +%f ') 3 * * 1-6/bin/tar-czvf/back ups/etc-$ (date ' +%f '). tar.gz3, every Sunday 2:30 A.M., run the CP command to backup the/etc/fstab file, the storage loca

, single-digit segment, 10-segment, 100-199-segment, 200-249-segment, 250-255-segment[[Email protected]_server home]# ifconfig | Egrep "\650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M01/72/51/wKioL1XgimTx5PjCAAHHzsHS2iA054.jpg "title=" the tenth question " alt= "Wkiol1xgimtx5pjcaahhzshs2ia054.jpg"/>There are still some problems, such as the number in the MAC address is not crawled out.Extensions: fetch the IP address of the ifconfig. The feature is that the first cannot be 0 for a rang

://s3.51cto.com/wyfs02/M01/72/5F/wKiom1XhxOCzuKQrAACuJ0RWhoU642.jpg "/>6. Add User bash, Testbash, basher, and Nologin user (Nologin user's shell is/sbin/nologin), then find out/etc/ A row in the passwd file that has the same user name as its shell name650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/72/5B/wKioL1XhxvygpgF6AACo3vS6Y-o857.jpg "/>7. Display the default shell and UID of root, CentOS, or User1 user on the current system (please create these users beforehand, if not present)

reality, and the sample itself has considerable limitations.Very Long Term HistoryTo see the bigger picture, please find the positions of the top ten programming languages of many years back. Please note that these is average positions for a period of the months.Programming Language Hall of FameThe Hall of Fame listing all ' programming Language of the Year ' award winners is shown below. The award is given to the programming language that have the highest rise in ratings in a year.Above from I

executes, the browser initializes all top-level variables under the Window object, and functions implemented by the assignment statement are not declared immediately when initialized.Function abc () {}//can be declared immediately prior to execution, and can be called at any location.var abc = function () {}//script does not exist until the line is executed, and the function is called only after the assignment statement.This is a keyword that relies on the parsing of the execution environment t

return ; - } Wu intM= (l+r)/2; - if(pm) AboutUpdate (P, L, M, rt*2); $ Else -Update (P, m+1, R, rt*2+1); - pushup (RT); - } A Static intN; + Public Static voidUpdateintLintRintLintRintRT) the { - if(LR) $ { the if(Num[rt]) the return ; the if(l==R) theUpdate (l, 1, N, 1); - Else in { the intMm= (l+r)/2; theUpdate (L, R, L, MM, rt); AboutU

does not pass the gateway indicates a problem with the network configuration ping domain name Description DNS problemThere are times when you need to modify the hardware address of the NIC:Method One:$ifconfig eth0 hw ether XX:XX:XX:XX:XX:XX$/etc/init.d/networking Restart (restart NIC)Method Two:The above is only a temporary modification of the hardware address to permanently modify, directly edit the/etc/network/interfaces file, after iface eth0 inet static Add a line: pre-up ifconfig eth0 hw

began to learn python, on the internet to find a grilled embarrassing encyclopedia of the essence of the crawler, their own slight modification of a bit, you can normal BA La embarrassing hundred Essence, others code dare not exclusive, posted out to share to everyone, nonsense No on the code: #-*-coding:utf-8-*-importurllib2import urllibimportreimportthreadimporttime #----------- Load handling embarrassing encyclopedia -----------classSpider_Model: def__init__ (self): self.page=1 self.pages=[]s

, respectively. The benefits of introducing generics into the Java language are simple and secure. In the case of Java SE 1.5, without generics, the "arbitrariness" of arguments is implemented by reference to type object, and the disadvantage of "arbitrariness" is to make explicit coercion of type conversions, which require the developer to be able to predict the actual parameter type. In the case of coercion of type conversion errors, the compiler may not prompt for an error and an exception oc

secondary numbers by character device and block device, linked to device/sys/device is a global device architecture, containing all the discovered physical devices registered on various buses, a hierarchical representation model of all the devices in the system, and the most important directory structure for/sys file system management devices./SYS/FS describes all file systems in the system/sys/kernel stores all the adjustable parameters in the kernel/tmp temp file/USR User program storage dire

"); the MainFrame obtained in the sub-page does not have the SRC attribute.Finally, a.html and b.html have found mainframe, but not the same element, why?Workaround: Parent page: mainframe=$ ("#mainFrame"); Sub-page: mainframe=$ ("#mainFrame", window.parent.document); Equivalent to Window.parent.document.getElementById ("MainFrame");If you write a generic method, you need to determine if SRC has a value.the function name of 9.JS is the keyword. function Delete (acl,ename); "Delete" is a keyword

(); for(intI=0; I){ if(Inputstring.charat (i) 'a'){//Uppercase LettersArraylist.add (Inputstring.charat (i)); }Else{arraylist2.add (Inputstring.charat (i)); }} collections.sort (ArrayList); Collections.sort (ARRAYLIST2); for(intI=0; I) {result.append (arrayList2.Get(i)); } for(intI=0; I) {result.append (arrayList.Get(i)); } returnresult.tostring (); }}My Android learning experience: http://jingyan.baidu.com/season/48891American Regiment

the class: public, Private.For classes, the class can only be accessed by all classes of the same package if the class does not have access to the control character before it. If public is added, it can be accessed by all classes in the package outside the package.For members, the default type is defaulted if no access control is added. The access attributes of a class member are as follows:1.private: Accessible only within the class2.default: can be accessed within the class, or it can be acce

The trend of web design is so fast that we have not even been able to realize it, and some of it is outdated. So, predicting how long a design trend will pop is a false proposition. Flash was once considered the hottest web design tool in the early 21st century, and a few years ago, glossy buttons were also essential components on the web, but now they have been swept away by flattened designs and HTLM5. Today's four design trends are carefully scrutinized, and they should continue to be popula

It's not that I don't understand, the world is changing fast! Microsoft has launched Visual Studio 2015 for the Linux platform! The former rivals are now moving towards convergence. I'm ready to challenge the installation of Microsoft Heavyweight software on the Linux platform so hi Big Ben. But I didn't think wow. It's not as challenging as I imagined. You'll know when you've finished. 1, Baidu "Visual Studio Downloads" This slide keywor

It must be admitted that WordPress is still the most popular and most easy-to-use content management system, the rational use of WordPress theme can make your website incarnation tens of millions, adapt to different needs, whether it is a news portal, or fashion station. It is this powerful plasticity that makes users have a very strong demand for WordPress themes. The classic WordPress theme has been sought after, and new trends and needs have prompted new themes. This is why at the end of the

in Word 2013, users can modify a custom Quick style at any time. The following is the 2015 title computer subjects word2003 Test Center review , in order to modify the built-in paragraph style for example, to introduce the specific method of the built-in paragraph modification. 　　Built-in paragraph style 1, apply paragraph style: Select the paragraph or paragraphs that you want to apply a style to, click Format//style and format, select the style y