Selected final answers, cs104 Spring 05

1b) Filenames in the _root_ ending in "dat":

  The root is the top of the computer. We know ~ is really
something like: /home/ugrad1/jsmith
  Clearly jsmith is a subdir of ugrad1, which is a subdir
of home. What directory is home in? Where can you %cd  to
so that %ls shows "home"? That's the root. The name of the
root is /, as the first thing.

  Also, dat often follows a dot (.dat) but one of the examples
was "sadat", so:

%ls /*dat

  There are usually no  dat  files in the root, but there could
be and it won't hurt to check.


1d) Print all files names to printer:

%ls -R -C | lpr -Phpljmumble-mumble

    We know  ls -R  shows all files. Like any other command, lpr
can read from the keyboard, and from a pipe. -C forces  ls  to
use columns (otherwise it will see the pipe and give you 1/line.
Try  %ls | cat  )

1i) The find and grep Qs before this were supposed to be a hint:

for f in $(find class -name "*")
do
  grep "transfer credit" $f
done


more.......