Shell Programming and Scripting

#!/bin/sh

if [ $# -eq 0 ] ; then
  echo "Usage: enshar filename1 filename2 [...]" >&2
  exit 1
fi
for file in "$@"
do 
    if [ -d $file ]
    then 
         echo "enshar: $file is a directory" >2    
         exit 1
    elif [ ! -f $file ]
    then 
         echo "enshar: $file does not exist" >2
         exit 1
    elif [ ! -r $file ]
    then 
         echo "enshar: $file is not readable" >2
         exit 1
    elif [ -h $file ]
    then 
         echo "enshar: $file cannot enshar" >2 
         exit 1
    fi
    cksum $file| read ck summy1 dummy2   # ck is the checksum
    echo "\!EnShAr!\ " 
    # no idea what this line is doing.   $1 cannot be used here and << makes no sense to me
    # try writing this out, not as script, but as what you want done here...
    "test $file = nnnnnnnnnn || echo $0: bad cksum in $file << '\!EnShAr!\'"
    cat $file
done

     echo "cat > $file <<\!EnShAr!"
              cat $file
              echo "!EnShAr!"
              echo "set `cksum $file`"
              echo "cksum" $file`
              check=$1
              echo "test $1 = $check || echo $0: Bad cksum in $file >&2 " >> shar
              echo "cat > $file <<\!EnShAr!" >> shar