Added youtube-dl cheatsheet
fixing typo in cheat git
added new examples for find
added examples for pdftk (manipulating pdf files)
added example for the gs command (reduce pdf file)
corrected typo for a better management of files with space in their name
To copy a key to a remote host on a non-standard port with non-standard ssh key
remove ssh-copy-id
add ssh on a non-standard port
Cheatsheets added

 - apk: Alpine Linux package manager
 - gcc: GNU C Compiler
 - grep: Pattern matcher in files or pipes
 - vim: Vi IMproved
Adding less cheat sheet
Adding additional ssh-keygen command examples
Adding additional ssh-keygen command examples
Added mysqdump backup and restore and basic connection
Added sheets for emacs and gpg
New cheats on find
New lsof cheat
Added 7z cheatsheet
Added ab cheatsheet
chead sed to remove empty lines