mongodb terminal commands

MAC Terminal statementNumber of words Read 111 comments 3 likes 3 PWD Current Working directoryCD (without parameters) into rootCD (path name) into the folderCd.. Parent Directorycd ~ Back to RootCD-Returns the last visited directoryRM File name DeleteCat file name (|less) to view files under TerminalLS lists all files in the directoryCP file name destination directory copy files to target directory~ stands for root such as: ~/document/cpp2/Mkdiv ne

starting with the J letterDb.dept.find ({"Dname":/^j/})Query for records with a in dnameDb.dept.find ({"Dname":/a/})Delete operationDelete a deptno=10 recordDb.dept.remove ({"Deptno": 10})Delete all recordsDb.dept.remove ({})Update actionUpdate all, the entire JSON object will be covered outDb.dept.update ({"Deptno": 30},{"Phone": "1354444444"})Partial update, modifying a property valueDb.dept.update ({"Deptno": 30},{$set: {"Phone": "1354444444"}})Statistical operationsTotal number of statistic

Restart command:1, reboot2. shutdown-r now reboot (root user)3, Shutdown-r 10 over 10 minutes automatic restart (root user use)4, Shutdown-r 20:35 restart at 20:35 time (root user use)If you set the restart through the shutdown command, you can cancel the restart with the Shutdown-c command.Shutdown command:1, halt immediately shut down the machine2, Poweroff immediately shut down the machine3, Shutdown-h now immediately shut down (root user use)4, shutdown-h 10 10 minutes after the automatic sh

permissions; =--set permissionsFile: r--read-only permission (read), w--Write permission (write), x--Execute permission (execute)Directory: r--allows files and subdirectories under the column directory; w--allows you to generate and delete files under directories; x--allow access to the directory(2) chmod xxx File/directory nameof which: execute=1;write=2;read=4X value: 0--does not have any permissions (common); 2--can only be written (uncommon); 3--can only be written and executed (uncommon);

Command name Function description Application examples Cat Show or connect files Cat filename Od Display the contents of a non-text file od-c filename Cp Copy a file or directory CP file1 File2 Rm Delete a file or directory RM filename Mv Change the file name or directory MV File1 File2 Find Finding files using matching expressions

Tag:try command execution javabspmain rgscomrorglin public class test{ public static void main (string[] args) { try { String shellstring =" Lame-b 16/java/5/a.wav "; string[] cmd = new string[]{"sh", "-C" , Shellstring}; Process process = Runtime.getruntime (). exec (cmd); Process process=runtime.getruntime (). EXEC ("Lame-b 16/java/5/a.wav"); Lame your. wav file, easy version Process.waitfor (); Block until the above command finishes, be sure to close the file be

Reprinted from 70312034(1) Input command(2) execution effect (because it has been updated so that all packages are up-to-date, otherwise the number of packages that need to be updated is displayed)(3) Input command(4) Performance: None (due to the update, the command line during execution to ask whether to download y/n, enter Y to confirm the download, the system will download the package and configuration, waiting time depending on the need to install the number of De and speed, the download pr

To see which databases are available:Show DBSSwitch to that library:Use library name Use LocalUse also has a function of "Create a Database" Use testTo delete a database:Db.dropdatabase ();To view a collection:Show collectionsTo create a collection:Db.createcollection ("user");Implicitly created, inserted directly into the collection, she will automatically create the collectionDb. user. Insert ({ID:1, Name: "Lisi"});To delete a collection:Db. user. Drop ();Insert:Db. user. Insert ({ID:1, Name:

data (2) Modify Db.users.update ({age:25}, {$set: {name: ' ChangeName '}}, False, True); Equivalent to: Update users set name = ' ChangeName ' where age = 25; Db.users.update ({name: ' Lisi '}, {$inc: {age:50}}, False, True); Equivalent to: Update users set age = Age + where name = ' Lisi '; Db.users.update ({name: ' Lisi '}, {$inc: {age:50}, $set: {name: ' HoHo '}}, False, True); Equivalent to: Update users set age = Age +, name = ' HoHo ' WHERE na

First, MongoDB installation configuration 1, get the latest version:wget http://fastdl.mongodb.org/linux/mongodb-linux-x86_64-2.0.2.tgz2, decompression can be performedtar zxvf mongodb-linux-x86_64-2.0.2.tgztar zxvf mongodb-linux-x86_64-2.0.2.tgzcd /usr/mongodb-linux-x86_64-

MongoDB is written in C + +, whose name comes from the middle part of the word humongous, and its ambition is the processing of massive data from its name. One of the most concise descriptions of it is: scalable, high-performance, open source, Schema-free, document-oriented database. The main goal of MongoDB is to set up a bridge between key/value storage (which provides high performance and high scalabilit

Common commands for creating, updating, and deleting MongoDb documentsMongodb is written by C ++. Its name comes from the middle part of the word humongous. From its name, we can see that its ambition lies in the processing of massive data. The simplest description of this database is scalable, high-performance, open source, schema-free, and document-oriented database. MongoDB's main goal is to build a brid

Label:Describes some of the advanced features of MongoDB support:Database commandsFixed-size collectionsGridfs Storing large filesMongoDB Support Database command for server-side JavaScriptthe principle of the commandThe commands in MongoDB are actually implemented as a special type of query that is executed against the $cmd collection. RunCommand simply accepts

Sort out common MongoDB operation commands Mongodb operation commands (note that all commands starting with "db." Must be used to access the specified database before the operation)Connect to the database:/Usr/local/mongodb-3.0.4/

Summary of MongoDB common commands simple additions and deletions to check the dataSpecify the display in the query results or do not display a fieldFor example, we want to find all the data in the lessons collection, but we don't want to include the Slides field in the return result, because slides is a huge array of base64-represented images that affect the reading of query results.Then we can follow the

include multiple servers for multiple users to access. In addition, the peer-to feature allows some systems to play the dual role of the client and server. HBase is a distributed, column-oriented, open-source database that comes from the Google paper "Bigtable: A distributed storage system of structured data" written by Fay Chang. The Yonghong Data mart is a software that is based on proprietary technology developed for the storage and processing of information. Yonghong Data Mart's Distributed