Terminal commands (part 4).

> Redirect output to filename
>> Append output to a filename
cat <file> Print content of file to screen
diff <f1> <f2> Diff files 1&2
touch <file> Create an empty file
mv <old> <new> Rename (move) from old to new
cp <old> <new> Copy old to new
rm <file> Remove file
rm -f <file> Force-remove file