merge krb5.conf files

test.awk

BEGIN {
	block_length = 0
	block_has_diff = 0
}
{
	if ( $0 ~ /{.*{/ || block_length ) {
		if ( $1 != $2 )
			block_has_diff++
		block1[block_length] = $1
		block2[block_length] = $2
		block_length++
	} else if ($1 == $2 || $1 ~ /default_realm/) {
		print $1
	} else {
		print $1
		print $2
	}
	if ( $0 ~ /}.*}/ ) {
		for (i=0; i<block_length-1; i++)
			print block1[i]
		print $1
		if (block_has_diff) {
			for (i=0; i<block_length-1; i++)
				print block2[i]
			print $2
			block_has_diff = 0
		}
		block_length = 0
	}
}

This script can be called like this:

paste -d'|' dataproc_{,2_}env_files/krb5.conf | awk -F'|' -f test.awk