Command substitution within sed expression

Question

I\'m having little problem with bash/sed. I need to be able to use command substitution within sed expression. I have two big text files:

• first is logfile.t

Answer 1

Just to let people looking for solution with bare shell and sed. Not perfect but working:

cat logfile.txt | while read line ; do id=$(echo -E "$line" | 
    grep "ERRORID:0x[0-9a-f]*" | grep -o "0x[0-9a-f]*" ) ; 
    if [ ! -z "$id" ] ; then echo -E "$line" | sed "s/$id/$(grep $id errors.txt | 
    grep -o '^[A-Z_]*' )/g" ;else echo -E "$line" ; fi ; done

If you see some fixing options then please share.