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.