Most powerful examples of Unix commands or scripts every programmer should know

Question

There are many things that all programmers should know, but I am particularly interested in the Unix/Linux commands that we should all know. For accomplishing tasks that we may

Answer 1

If you make a typo in a long command, you can rerun the command with a substitution (in bash):

mkdir ~/aewseomeDirectory

you can see that "awesome" is mispelled, you can type the following to re run the command with the typo corrected

^aew^awe

it then outputs what it substituted (mkdir ~/aweseomeDirectory) and runs the command. (don't forget to undo the damage you did with the incorrect command!)