From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Tue,  9 Apr 1996 15:36:40 -0400
From: none@plan9.bell-labs.com none@plan9.bell-labs.com
Subject: plan9 sed
Topicbox-Message-UUID: 42bd47ce-eac8-11e9-9e20-41e7f4b1d025
Message-ID: <19960409193640.nbCECGRkKl2zTCibrjDWNb8OC4hIoStBW7d11thltkI@z>

cpp a.c|sed -n '/^#line/s/.*"(.*)".*/\1/p'|sort -u