Shell Programming and Scripting

echo "Printing Unmatched lines ..."
echo "---------------------------------"
while read line
do
  fst1=`echo $line|cut -c 1`
  lst2=`echo $line|sed -e "s/^.*\(.\)$/\1/"`
  fst2=`echo $line|awk -F" " '{print $3}'|cut -c 1`
  lst1=`echo $line|awk -F" " '{print $1}'|sed -e "s/^.*\(.\)$/\1/"`
  if [ $fst1 != $fst2 ] || [ $lst1 != $lst2 ]; then
    echo $line
  else
    echo "Great !! Variables matched for this line"
  fi
done < datafile
$ cat datafile
valu -> value
confirmaton -> confirmation

perl -n -e '/^\s*(\w)\w*(\w)\s*->\s*(\w)\w*(\w)\s*$/;print if ( $1 ne $3 || $2 ne $4) ;' infile

gawk -F "->" 'function fe(n) {return gensub(/(.).*(.)/,"\\1\\2","g",n)}
{a=$0;gsub(/ /,""); if (fe($1)!=fe($2)) print a}' infile

 
cat fileName | grep -v "\(.\).*\(.\) -> \1.*\2"

 cat fileName | grep -v "^\(.\).*\(.\) -> \1.*\2$"