RM command, delete command, can be a file and directory, its function is to delete one or more files or directories in a directory, it can also delete a directory and all the files and subdirectories below it. For linked files, only the links are deleted and the original files remain unchanged.Command formatRM [ Options ] file or directoryParameter options:-F,--force Force Delete, no matter if there are files, do not prompt-V,--verbose detailed display of the removal steps-I,--interactive Prompt
only three owners whose IDs are 1, 2, and 3. Suppose we add more owners to the table, as shown in Listing 4 (The shipperid column has the identity attribute, and SQL server automatically generates a value for this column ).
[Listing 4: insert some records to the shippers table]
Insert into shippers values ('shipper4', '(111) 222-9999 ')
Insert into shippers values ('shipper5', '(111) 222-8888 ')
Insert int
Dynamic | data | Database Suppose we add more shippers to the table, as shown in Listing 4 (the ShipperID column has the identity attribute and SQL Server automatically generates a value for that column).
"Listing 4: Insert some records into the Shippers table"
INSERT into Shippers VALUES (' Shipper4 ', ' (111) 222-9999 ')
INSERT into Shippers VALUES (' Shipper5 ', ' (111) 222-8888 ')
INSERT into Shi
1. View directory information[Email protected] ~]# ls-l/usr/bin/passwd-rwsr-xr-x. 1 root root 30768 February 2012/usr/bin/passwdExplanatory notes:This permission is represented by a number 4755, and the permission of S depends on where it is, where it is in the position of u, that is, 42, set Sgid (Let ordinary users have the rights of the owning group)[Email protected] ~]# ls-l/bin/ls-rwxr-xr-x 1 root root 117024 November 2013/bin/ls[Email protected] ~]# chmod g+s/bin/ls[Email protected] ~]# ls
Php export csv format data and convert numbers into text ideas and code sharing. Php export csv format data implementation: first define a string to store content, such as $ exportdata Rule 111, Rule 222, audit 222, Rule 222, server 2222, rule 1, rule 2, rule 3: match characters. php exports csv format data when setting:
First define a string storage content, suc
Operations for local files:Open ():#!/usr/bin/env python#--*--coding:utf-8--*--" "Open () gets a handle to the open () parameter description: R read the form open RU to identify different systems of newline W write form open, and clear the original content, the file does not exist in the form of creating the file a append write opened handle action method: Seek pointer offset flush commit update close closed open file" "" "rfile = open (' C:\\users\\lixin\\desktop\\
DraghorizontalscrollviewI. Sub-layout does not have a custom layout (contains Android native layout only)Onintercepttouchevent do not intercept sub-layouts can be clicked-------Onintercepttouchevent does not intercept part1---------ontouchevent not receiveI/>>lilei>>draghorizontalscrollview (23283): ****return false Onintercepttouchevent 222 Action:ACTION_ DownI/>>lilei>>draghorizontalscrollview (23283): ***#### ontouchevent return False Action:action
This article is reproduced from http://blog.chinaunix.net/uid-22566367-id-381955.htmlSelf-documenting content. The shell script that encountered the relevant content in the project. Record in this placestring1="111 222 333 4444"echo $STRING 1echo"$ STRING1"The output of both pieces of code is111 222 333 4444The second piece of codestring2="111 222 333 444"ech
line, which means that the Var variable is not initialized;Variable Assignment mode:Var=value #注意: cannot have spaces on either side of the equals sign 1 1, variable initialized condition 2[Email protected]222- the- -- -:~/CP/SH# colour="Reb"3[Email protected]222- the- -- -:~/CP/SH#Echo "is ${colour+"Blue"}"4 is Blue5[Email protected]222- the- -- -:~/CP/SH#Echo$
Php exports csv format data and converts numbers to text. Php export csv format data implementation: first define a string to store content, such as $ exportdata Rule 111, Rule 222, audit 222, Rule 222, server 2222, rule 1, rule 2, rule 3: match characters. php exports csv format data when setting:
First define a string storage content, such
$ Exportdata = 'rule
maintain the order of entries connected to the specified table location of HashMap, and before and After are used to maintain the Entry insertion sequence.
You can also use a diagram to indicate the attributes:
Initialize LinkedHashMap
Suppose there is such a piece of code:
1 public static void main(String[] args)2 {3 LinkedHashMap
linkedHashMap =4 new LinkedHashMap
();5 linkedHashMap.put("111", "111");6 linkedHashMap.put("
Demand:A, read a| in turn b| C three files and terminates immediately if there is a failure.B, simultaneous reading a| b| C three files and terminates immediately if there is a failure.First, callback需求A: Let read = function (code) {if (code) {return true; } else {return false; }}let Readfilea = function (callback) {if (read (1)) {return callback (NULL, "111"); } else {return callback ("a Fail"); }}let Readfileb = function (callback) {if (read (1)) {return callback (NULL, "
": ["AAA", "BBB", "CCC", ["ddd", "Eee"], "fff", "GGG"], "test2" : ["CCC"], "test4": "TESTV4", "Test5": "OK"}6) $addToSetUsage: {$addToSet: {Field:value}}Adds a value to the array, and only if the value is not inside the array. Cases:> db.test0.update ({"_id":}, {$addToSet: {"test1": {$each: ["444", "555"]}});> Db.test0.find ({"_id": 15});{"_id": {"Floatapprox": "$", "count": 18,"Test1": ["AAA", "BBB", "CCC", ["ddd", "Eee"], "fff", "GGG", ["111", "222"
What is the principle of MySQL's InnoDB engine lock, to do an experiment.Mysql> SELECT VERSION ();+-----------+| VERSION () |+-----------+| 5.5.20 |+-----------+1 row in Set (0.00 sec)CREATE TABLE Test(A INT (5),b VARCHAR (10),C VARCHAR (10));INSERT into Test VALUES (1, ' 111 ', ' 111 ');INSERT into Test VALUES (2, ' 222 ', ' 222 ');INSERT into Test VALUES (3, ' 333 ', ' 333 ');INSERT into Test VALUES (4, '
Demand:
A, read a| in turn b| C three files and terminates immediately if there is a failure.B, simultaneous reading a| b| C three files and terminates immediately if there is a failure.First, callback
需求A:
Let read = function (code) {if (code) {return true; } else {return false; }}let Readfilea = function (callback) {if (read (1)) {return callback (NULL, "111"); } else {return callback ("a Fail"); }}let Readfileb = function (callback) {if (read (1)) {return callback (NULL, "
ERROR Failed to compile with2Errors A:xx: -Errorinch./src/App.vuemodule Build failed:Error:No parser and NofilePath given, couldn'T infer a parser.At Normalize (C:\Users\admin\Desktop\222\demo\node_modules\prettier\index.js:7051: -) at Formatwithcursor (C:\Users\admin\Desktop\222\demo\node_modules\prettier\index.js:10370: A) at C:\Users\admin\Desktop\222\demo\nod
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