mkdir - make directory
rm - how to remove full directory
cat - cat stands for "catenate." It reads data from files, and outputs their contents.
touch - The touch command updates the access and modification times of each FILE to the current system time. If you specify a FILE that does not already exist, touch creates an empty file with that name
ls - Lists the contents of a directory. If you want to see the the permission of a file you can use
ls -l /path/to/file command.tar -
gzip -
gunzip -
tail - tail -f app/tmp/logs/error.log
grep '|' app/etc/applied.patches.list click
Find files modified in the last 10 days: find wp-content -type f -mtime -10 