There is something I wish I could remember and forget again and again, so I note them down.
.tar ; use tar -xvvf to un-tar them
.gz ; use uncompress
find . -name xxx ; search for a file or dir named xxx in the current directory
rm ; to delete a file
rm -r ; to delete a directory
more ; to see the first few lines of a file
less ; to see the last few lines of a file
rpm -ivh packageName ; to install a rpm package
