If the file names don't have spaces or other metacharacters, you can use xargs (and then the command won't fail if there are too many files):
find blah blah blah | xargs grep orderNumber | wc -l
# Update:
# or even:
find blah blah blah | xargs grep -c orderNumber |
 awk '{tot+=$1} END{print tot}'

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In reply to Re: Perl 'pipe' problem (or sh monks) by runrig
in thread Perl 'pipe' problem by mifflin

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