crontab -u www-data -e– Edit crontab of user where www-data is the user.rsync -a /dir1/ /dir2/– Sync two directories. This overwrites files with the same names.stat file.txt– Show information about a file or directory.du -sh directory/– show file or directory size.zip -r zip_filename.zip directory/– zip up a directory.unzip zip_filename.zip– unzip file to current directory.zipinfo zip_filename.zip– list files and directories in a zip file.grep -i “whatever” file.txt– search for “whatever” in file.txt.!!– run last command.sudo !!– run last command as root.
One of the easiest tools to use if you don’t know the syntax of a command is TLDR. On Ubuntu you
can simply install it using apt, apt install tldr. Simply use tldr zip where zip is the
command you wish to know more about.