cd ..
followed by enter. Note the space between the cd and the two periods — this is where MS-DOS users will really go nuts.
cp Copies a file. The syntax is
cp file1 file2
which would copy file1 to file2 (or overwrite file2 with file1).
ls This command, when followed by enter, tells you what's in the directory, similar to the DOS dir command, except in alphabetical order.
ls | more
will stop the listing every 24 lines — handy if there are a lot of things in the directory. The basic ls command does not list "hidden" files, such as the .login file that controls how your system interacts with Unix. To see these files, type
ls -a or ls -a | more
ls -l will tell you the size of each file in bytes and tell you when each was created or modified.