Hello there,

As it was said, you really have to define a pattern/structure for your file including the exact field numbers where data is supposed to be modified or at least a group of specific values according to which the script has to search the file and to add what is missing.

Just for giving you a first idea, if the specific values are 441 and 442, then the following KornShell script will do the job

#!/bin/ksh

RESULT=""

while read LINE
do
    for ITERATOR in $LINE
    do
        if [[ $ITERATOR = "442"  ]]
        then
            RESULT="$RESULT 441 $ITERATOR"
        else
            RESULT="$RESULT $ITERATOR"
        fi
    done
    RESULT="$RESULT\n"
done < $1

print "$RESULT" > $1