Bash Scripting Line count over several files

[AplexTM 3]

#!/bin/bash
############################################################################
#
# Usage: loc7.sh [options] file ...
#
# Count the number of lines in a given list of files.
# Uses a for loop over all arguments.
#
# Options:
#  -h     ... help message
#  -d n ... consider only files modified within the last n days
#  -w n ... consider only files modified within the last n weeks
#
# Limitations: 
#  . only one option should be given; a second one overrides
#
############################################################################

help=0
verb=0
weeks=0
# defaults
days=0
m=1
str="days"
getopts "hvd:w:" name
while [ "$name" != "?" ] ; do
 case $name in
  h) help=1;;   
  v) verb=1;;   
  d) days=$OPTARG
     m=$OPTARG
     str="days";;
  w) weeks=$OPTARG
     m=$OPTARG
     str="weeks";;
 esac 
 getopts "hvd:w:" name
done

if [ $help -eq 1 ]
then no_of_lines=`cat $0 | awk 'BEGIN { n = 0; } \
                                /^$/ { print n; \
                                       exit; } \
                                     { n++; }'`
     echo "`head -$no_of_lines $0`"
     exit 
fi

shift $[ $OPTIND - 1 ]

if [ $# -lt 1 ]
then
 echo "Usage: $0 file ..."
 exit 1
fi

if [ $verb -eq 1 ]
 then echo "$0 counts the lines of code" 
fi

l=0
n=0
s=0
for f in $*
do
 x=`stat -c "%y" $f`
 # modification date
 d=`date --date="$x" +%y%m%d`
 # date of $m days/weeks ago
 e=`date --date="$m $str ago" +%y%m%d`
 # now
 z=`date +%y%m%d`
 #echo "Stat: $x; Now: $z; File: $d; $m $str ago: $e"
 # checks whether file is more recent then req
 if [ $d -ge $e -a $d -le $z ] # ToDo: fix year wrap-arounds
 then 
     # be verbose if we found a recent file
     if [ $verb -eq 1 ] 
       then echo "$f: modified (mmdd) $d"
     fi
     # do the line count
     l=`wc -l $f | sed 's/^\([0-9]*\).*$/\1/'`
     echo "$f: $l"
     # increase the counters
     n=$[ $n + 1 ]
     s=$[ $s + $l ]
 else
     # not strictly necessary, because it's the end of the loop
     continue
 fi
done

echo "$n files in total, with $s lines in total"