Create bootable usb drive of OSX from Mac OS

You can read the following document to get the clear picture:
https://support.apple.com/en-us/HT201372

Use mac’s createinstallmedia command. The format is given below.

$ sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia --volume |YOUR-USB-DRIVE-PATH-HERE| --applicationpath |DOT-APP-FILE-MACOS|

In My case the command will be as follows:

$ sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/ABHI\'S/ --applicationpath /Applications/Install\ macOS\ Sierra.app/
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Mongodb how to Import / Export

For Importing a mongodb use the following command

$ mongodump --db database_name

This will dump the json/bson files into dump/db_name folder
Or specify a directory with -o option

$ mongodump --db database_name -o path_to_folder

For Exporting a mongodb use the following command

$  mongorestore --db database_name path_to_the_json_bson_files

path_to_the_json_bson_files => That we already imported and stored before.