The bash shell has so many nifty tricks. They can come in handy in order to save time with repeated tasks, recover data, etc.
1. My set of customizations for bash can be found on github. With those customizations, you can make find easier, colorize diff, man and prevent clobbering when using output redirection. I especially love the colored man pages.
2. If you want to sudo-ize the previous command, use;
3. rename utility: I never knew this! It makes renaming multiple files using regex patterns so much easier!
4. In scripts, instead of the awkard test command ‘[‘, use ‘(( … ))’ and ‘[[ … ]]’ in its place. It makes logical and string comparison so much easier. (ref: modern bash test operators)
Some more examples can be found here: bash trick commands
There are also some intricacies like the difference between rm and unlink: rm vs unlink
Feel free to suggest more in your comments.
Note: The file .bashrc is not loaded by bash at startup, by default. So it must be included in either the file .profile or .bash_profile.