What are your favorite command line tips or tricks?
In the same vein as my previous question about bash aliases, what are your favorite command line tricks? What command has saved you the most time? What bash features did you never realize existed and now use daily and can’t live without?
Of course, there are the classics:
!!- Re-runs the last command you entered
sudo !!- Re-runs the last command you entered as a super user
What are yours? (No cheating.)
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