09-25-2012
Nope. it runs
ls -r. Since ls doesn't read anything you type into it, just lists files, that's pretty pointless.
The assignment told you what command to feed ls's output into --
sort. There's an actual command named that, which does what it says on the label.
You could have just done
ls -r in the very first exec to have it list in reverse order from the start, avoiding having to launch a second process. But then you wouldn't be learning how pipes work...
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MACUTIL(1) General Commands Manual MACUTIL(1)
NAME
macutil - A package that deals with MacIntosh files on a Unix system
DESCRIPTION
macutil is a package that contains a number of utilities that deal with MacIntosh files on a Unix system. It contains the following pro-
grams:
binhex Convert files to BinHex 4.0 compatible hexified form.
frommac
Receives files from the MacIntosh on the Unix system.
hexbin Convert hexified files to their MacIntosh format.
macsave
Save a series of files from a MacBinary stream as individual files.
macstream
Combine a series of files to a MacBinary stream.
macunpack
Unpack a MacIntosh archive into its constituents.
tomac Transmits files from the Unix system to a MacIntosh.
BUGS
This manual page is hopelessly incomplete!
SEE ALSO
binhex(1), frommac(1), hexbin(1), macsave(1), macstream(1), macunpack(1), tomac(1)
AUTHOR
Dik T. Winter, CWI, Amsterdam, The Netherlands (dik@cwi.nl)
3rd Berkeley Distribution October 22, 1992 MACUTIL(1)