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After 24 posts, you already know that we endorse you to make an attempt first.

Also, please provide operating system and shell details.

Regards
Peasant.

FWIW - https://bugs.launchpad.net/ubuntu/+source/dash/+bug/141481

dash is supposed to be POSIX-compliant but it still seems that it does not have all of the features that bash has, the $( )...

How about using awk

zcat /var/log/messages.2.gz | awk -v MAC=0012CFCDA11A -v C=0 '{ if ($0 ~ "DHCPDIS.*94.18.*"MAC ) C++ } END { print C, MAC }'