Useful Commands

Reload .profile to Modify Corrupted .bashrc

If something went wrong with the .bashrc file (and sourced it), such as:
The misapplied export command for exporting a path causes the path leads to nowhere and resulted in command not found.

Type in the following command to reload .profile:

. ~/.profile

Then open the editor to modify the .bashrc file:

vim ~/.bashrc

Remove the line inside .bashrc that causes the problem, and source it again.

source ~/.bashrc

Cannot Execute Shell File Using ./

Considering modifying the Bash Shebang #!.

Instead of using the absolute path to the bash binary:

#!/bin/bash

Use the env utility:

#!/usr/bin/env bash