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# save the present working directory into bookmarks file
alias dmk="pwd >> ~/.dmks"

# cd into a bookmarked directory by fzf selection
alias cdmk="cd \$(cat ~/.dmks | fzf)"

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GRUB CLI usage for boot

Boot into recovery mode using Grub cli

Entering Grub cli

After the initial BIOS splash screen, press Shift to open GRUB menu. Then press c to enter CLI mode.

You will see a terminal like following

grub> 

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SSH Tunnelling

Connect local port to server port

Introduction

An SSH tunnel creates a connection between a port on your local machine and a address + port on the server, and tunnels the data to the server over SSH on port 22 to the server address + port.

This is done so that it doesn't get blocked by any firewalls or security groups (assuming only SSH connections are allowed to the server). After the data reaches the SSH server it gets forwarded to the address + port you specified when you created the SSH tunnel.

An important detail here is that the destination address + port are accessed from the context of the server, so localhost or 127.0.0.1 refer to the server machine on the destination side of the tunnel, not your local machine.

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MongoSQL as service

Run mongosql as a service with auto start on server restart

Download MongoSQL

1. Download the BI Connector from the MongoDB Download Center

2. Install the MongoDB Connector for BI.

   Extract the .tar archive you downloaded.