collate copies

Sometimes we need to overwrite a folder to our working directory, but need to automatically back up the existing files, one to go back to the backup is too troublesome, all the backup is not necessary. Shell scripts can do a good job of doing this. Original link http://back.zhizhi123.com/?p=85#!/bin/SHUpload_dir=/alidata/www/SH/useful-shell-script/upload/Www_dir=/alidata/www/SH/useful-shell-script/www/backexist () {filelist=`ls$1` for file inch$filelist Doif[-F $1$file ] Thenif[-F $2$file ] Then

Reference: Http://vim.wikia.com/wiki/%22copy_all_to_clipboard%22_howtoVim has two buffers for the system's clipboard, they are: * (primary selection) and + (clipboard), where + is we can normally use ctrl-c and ctrl-v buffer, and to take out * Buffer content, click the middle of the mouse wheel can be.View buffer contents can be used with the command : Reg , above two buffers shown as "* and " +1.Normal ModeGG"*yggg"+yg2.Visual Mode (linewise) supplement: Press V to enter the modeGgog"+y3.Visual

Remote backup large capacity often there is the case that the file from remote backup is very large, it takes a long time, you want to exit SSH after the program can still continue to download in the background, can be established through the establishment of inter-server security information relationship and nohup way to solve.There are two servers: a server IP 192.168.3.100, b server IP 121.41.111.46.I. Establish a secure trust relationship certificate between servers1. Generate key pairing on

Hui, Xiao Hui, da Hui- alert (a.key2); Xiao Hui, Xiao HuiFrom the above, when modifying the key2 array of B, there is no new value for the Key2 array in the A parent object, that is, the child object does not affect the Key2 in parent object A. The storage mode is roughly as follows:The following is an example of a $.extend () deep copy.varObject1 ={apple:0, Banana: {weight: the, Price: -}, Cherry: the};varObject2 ={banana: {price: $}, Durian: -};//Deep Copy//object1--->{"apple": 0, "ban

I always thought CP was a very simple instruction. It turned out to be a pit. Record it.Folder 1:test1/Folder 2:test2/Target: Copy all files and directories in the test1/to test2/Correct instruction:CP -RF test1/. test2/Note that the back of the test1/is a pointThe following command is problematic:CP -RF test1/* test2/I have been using this sentence, the results found today, if Test1 is an empty folder, the command will error. But if you replace the *. There is no problem at all."Linux"

The problem will be similar to "Hello world!" into "Hello world!."problem idea : First cut the string and then regroup the stringCore codepublic void filter(String s){ String[] b = s.split("\\s+"); StringBuffer stringBuffer = new StringBuffer(); for(String c:b){ stringBuffer.append(" "+c); } System.out.print(stringBuffer.toString()); }Java copies a string to another string and removes the extra whitesp

Let obj = {age:10}Let obj1 = {grade:1, name: {first: ' Bob '}}Let Objs = Obj1let Obja = object.assign (obj, obj1) Let OBJJ = Json.parse (json.stringify (obj1)) Let OBJK = {... obj1}Console.log (Obja) console.log (OBJJ) console.log (OBJK)Obj1.grade = 9obj1.name.first = ' Chris 'Console.log (OBJS) console.log (obja) console.log (OBJJ) console.log (OBJK) printing results:{age:10, grade:1, name: {first: ' Bob '}}{grade:1, Name: {first: ' Bob '}}{grade:1, Name: {first: ' Bob '}}{grade:9, Name: {first

Article Directory Types of variables in JavaScript Understanding of deep copies and shallow copies How to implement deep and shallow copies Why deep copy and shallow copy required Types of variables in JavaScript(1), basic typeThere are five basic types in javascript: null, Undefined, Boolean, string, number. Variables are stored by valu

Linux copies all files in the specified directory to another directoryCopy all files in the specified directory to another directoryThe copying of files and directories is often used. The commands for copying under Linux are CP.Assume that the replication source directory is dir1 and the destination directory is DIR2. How can I copy all the files under the Dir1 to Dir2?If the Dir2 directory does not exist, you can use it directlyCp-r Dir1 Dir2Can.If t

modified time does not replicate. For example, copy all the fonts under the C Disk font folder (assuming there are subfolders and other types of files under the folder) and copy them to the X disk fonts file (x-letter is not sure), and how to achieve the above effect. Copy Code code as follows: xcopy *.ttf%1:\fonts\*.*/s/d/y Do not guess the results, run a look at the results. xcopy parameter Introduction Command format: XCOPY source [destination] a bunch of optio

when you install Enterprise Library 3.0, you actually get two distinct copies of the library. one copy is in the form of pre-compiled binaries-by default these get installed to "C: \ Program Files \ microsoft Enteprise library 3.0-release L 2007 \ bin ". the other copy is in the form of source code, which by default will be compiled and the Assemblies coped to "C: \ entlib3src \ app blocks \ bin ". while both

How to copy data from a MySQL table to a new table. 1. MySQL copies the table structure and data to the new table CREATETABLEnew_tableSELECT * FROMold_table; 2. Only copies How to copy data from a MySQL table to a new table. 1. MySQL copies the TABLE structure and data to the new table create table new_table SELECT * FROM old_table; 2. Only

1. Lists and dictionaries, directly assigned, are shallow copies, where both sides point to the same address, because Python passes by reference to mutable objects.>>> a = [1, 2, 3]>>> B =a>>>b[1, 2, 3]>>> A[0] ='Apple'>>>a['Apple', 2, 3]>>>b['Apple', 2, 3]>>> >>> >>> dic = {'a':'Apple','b':'Banbana'}>>> Dic2 =DiC>>>dic2{'a':'Apple','b':'Banbana'}>>> dic['b'] ='Blueberry'>>>dic{'a':'Apple','b':'Blueberry'}>>>dic2{'a':'Apple','b':'Blueberry'}2. For a n

The copies between objects in the objective-c are divided into shallow and deep copies. Plainly, a shallow copy of a non-container class is the address of the copied object, and the contents of the object are still a copy, and no new memory is allocated. A deep copy of a non-container class is a rewrite of the allocated memory, and then the contents of the other object are left intact for me. A deep copy of

If an object's value can be modified, the object was said to be mutable. If The value cannot be Modified,the object is said to be immutable. mutable mutable types, such as List,set, are custom types (equivalent to reference types in C #); Immutable immutable types, such as string,numbers (equivalent to value types in C #); I. References and copies (references and copies) When using the = assignment operato

#中有两种类型变量, one is a value type variable and one is a reference type variable.For the former, copy is a copy of the whole, whereas for the latter, the general copy is only a shallow copy, only the reference address, which is equivalent to passing only one reference pointer. Therefore, it is also the most troublesome to make a real copy of the latter, specifically, it is necessary to implement the Clone method provided in the ICloneable interface to produce a completely new object.Shallow copy (Sh

ChenssySource: http://www.cnblogs.com/chenssy/First look at the definition of shallow copy and deep copy:Shallow copy: Use a known instance to assign a value to the member variable of the newly created instance, which is called a shallow copy. Deep copy: When a copy of a class is constructed, the value of all non-reference member variables of the object is not only copied, but also a new instance is created for the member variable of the reference type and initialized to the formal parameter ins

1. Shallow copy and deep copy concept(1) shallow copy (shallow clone)A shallow copy is also called shallow copy, and all the fields in the object are copied to the new object (copy). Where the value of the Value Type field (the original type in Java 8) is copied to the replica, the modifications in the copy do not affect the value corresponding to the source object. If a reference type's field is copied to a reference of a reference type, rather than a referenced object, modifying the field valu

Reprint Address: http://blog.csdn.net/linuxdrivers/article/details/7487618 First, if the reader is unfamiliar with what is 0 copy, please refer to the link below: 0-Copy technology in Linux, part 1th Http://www.ibm.com/developerworks/cn/linux/l-cn-zerocopy1/index.html 0-Copy technology in Linux, part 2nd Http://www.ibm.com/developerworks/cn/linux/l-cn-zerocopy2/index.html Effective data transfer through 0 copies http://www.ibm.com/developerworks/cn/ja

In Python, there are no types of variables, which are different from most editing languages that you've seen in the past. When using a variable, you do not need to declare it in advance, just assign a value to the variable. However, when you use a variable, you must assign a value to the variable, and if you write only one variable without assigning a value, Python does not think the variable is defined. As follows: >>> Atraceback (most recent): File " ", line 1, in