How do I save output command to variable bash?

How do I save output command to variable bash?

Bash Assign Output of Shell Command To And Store To a Variable

1. var=$(command-name-here) var=$(command-name-here arg1) var=$(/path/to/command) var=$(/path/to/command arg1 arg2)
2. var=`command-name-here` var=`command-name-here arg1` var=`/path/to/command` var=`/path/to/command arg1 arg2`

How do I run a MongoDB script?

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1. Simply put your mongo script into a .js file and execute.
2. mongo < yourFile.js.
3. Example:
4. Now keep this file in “c:db-scripts”
5. Then in cmd prompt go to “c:db-scripts”
6. The above syntax will execute the code in mongo and shows the output as:

How do I select a database in MongoDB?

Open a new database connection. Open a connection to a new server using new Mongo() . Use getDB() method of the connection to select a database.

How do I export MongoDB to CSV?

Export MongoDB to CSV (e.g. Excel)

1. Export source – Displays the source connection, database, and collection.
2. Select fields – Add or remove custom fields and check or uncheck fields to be included in the export.
3. Select target – Choose between clipboard or file, and define the file path as needed.

How to execute MongoDB commands from BASH script?

If you do need to change databases from a scripted session, there is a db.getSiblingDB () JavaScript function. An alternative way to write the shutdown command above would be: You can use heredoc syntax. Turns out heredoc syntax throws a warning when EOF is missing at the end for bash script.

How to save the output of a bash script?

The script is connecting to a specified server via telnet and executes different commands. One command is needed for further commands. Well… I have to save these informations from the command output.

How to write JavaScript in the mongo shell?

From the system prompt, use the mongo shell to evaluate JavaScript. Use the –eval option to the mongo shell to pass the shell a JavaScript fragment, as in the following: This returns the output of db.getCollectionNames () using the mongo shell connected to the mongod or mongos instance running on port 27017 on the localhost interface.

How to set the global variable in Mongo?

To set the db global variable, use the getDB () method or the connect () method. You can assign the database reference to a variable other than db. Write operations in the mongo shell use a write concern of { w: 1 } by default.