Shell Programming Case Study #2

#!/bin/sh
# case study #2
# LIST is a file that contains a list of filenames.
# I want to see which of those files exist and which do not
# in the directory LONGPREFIX.
CLASS=242
LIST=/cgi-bin/s2004fal/hmwk/qfiles.$CLASS
SHORTPREFIX=f.hmwk/pracun/
LONGPREFIX=/cgi-bin/s2004fal/hmwk/$SHORTPREFIX
STATUS=1  # assume a non-successful result

T1=/tmp/f1.$$
T2=/tmp/f2.$$
rmtmp() {
   rm -f $T1 $T2  # -f suppress err msg if file does not exist
   exit $STATUS   # exit script with meaningful Status code
}

trap "rmtmp" 0 1 2 3 15

sort $LIST > $T1
ls $LONGPREFIX |
   grep -v notincluded |
   sed "s;^;$SHORTPREFIX;" |
   sort > $T2

   # must use dbl quotes, not single, in sed to allow $SHORTPREFIX
   # must change sed delimiter since $SHORTPREFIX contains slashes

read XX
comm $T1 $T2 
STATUS=$?

	f.hmwk/pracun/pracun13.poor
	f.hmwk/pracun/pracun14.chk
	f.hmwk/pracun/pracun14.cmds
	f.hmwk/pracun/pracun14.cmds2
	f.hmwk/pracun/pracun14.umask
		f.hmwk/pracun/pracun18.re1
		f.hmwk/pracun/pracun18.re2
	f.hmwk/pracun/pracun18.tel
	f.hmwk/pracun/pracun18.tel2
		f.hmwk/pracun/pracun19.sed
		f.hmwk/pracun/pracun19.sed-2
		f.hmwk/pracun/pracun19.sed-3

col1 = files in LIST that are not in DIR
	col2=files in DIR that are not in LIST
		col3=files in common