Enabling client authentication in MongoDB

Before enabling authentication in MongoDB, we'll have to create a user and assign it a built-in role. We'll use the built-in "root" role that provides admin access to all databases.

I've done this in Ubuntu using MongoDB 3.2.

Limiting grep output

Here's a quick way to limit output of the grep command.

Most of the time, we issue the following to find needle in the haystack:

grep needle file.txt

This prints out the matching pattern. If the output is way too long and we only need a section of it, we can use the extended grep (a.k.a. egrep) option.