Shells like Bash or Zsh have one neat feature: repeat last command.
How to invoke it? Use double exclamation mark:
!!
This is very handy when you have typed the command as normal user, but it must be executed by sudo.
Example:
apt-get install safeq
E: Could not open lock file /var/lib/dpkg/lock - open (13: Permission denied)
Execute the same command with elevated privileges:
sudo !!
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