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Never forget:
:w !sudo tee % Save a file in vim when you neglected to open the file with sudo but already made changes you don't want to lose.
:w !sudo tee %
sudo
Ctrl+X,* Evaluate globbing on your current input on the bash command line.
postfix flush Pump out the postfix queue on your backup MX after you've fixed the issue with your primary MX.
postfix flush
git tag -l | xargs -n 1 git push --delete origin; git tag | xargs git tag -d Delete all tags from a git repo - remotely and locally.
git tag -l | xargs -n 1 git push --delete origin; git tag | xargs git tag -d
sudo apt-get purge $(for tag in "linux-image" "linux-headers"; do dpkg-query -W -f'${Package}\n' "$tag-[0-9]*.[0-9]*.[0-9]*" | sort -V | awk 'index($0,c){exit} //' c=$(uname -r | cut -d- -f1,2); done) Delete old kernels
sudo apt-get purge $(for tag in "linux-image" "linux-headers"; do dpkg-query -W -f'${Package}\n' "$tag-[0-9]*.[0-9]*.[0-9]*" | sort -V | awk 'index($0,c){exit} //' c=$(uname -r | cut -d- -f1,2); done)
https://signup.microsoft.com/productkeystart Register new Office 365 product keys for an existing tenant.
