Some signs that you aren't as comfortable as you could be when using a command line. Drawn from observations over twenty years at many companies.
Runs all over the Tennis CourtTo see what's in a directory, you type:
cd very/long/pathor even worse
cd veryThis is the easy way:
Drives With Accelerator, Brake, Accelerator, Brake, ...
You start an editor to look at a file, then quit the editor to list the directory, then start the editor to look at the file again. Repeat. At least bring up another window and edit the file from there. Or browse the directory from inside your editor.
Tells Jokes With Too Much Detail
You type every character in file or directory names. Autocompletion comes with almost every shell and will do the typing for you.
Never Takes Elevators
You move around the command line only with the arrow keys. Sometimes doesn't even hold them down for repeat but instead presses the desired key many, many times. Keboard shortcuts to move around and delete larger blocks of text such as words not used.