<make-a-list> | while read x; do <pretty-much-whatever> "$x"; done
which should get around the list length limitations and
provides for doing "extras" between the "do" and the "done".
Specifically:
find /path/to/files/ -mtime -2 -print | \
while read x; do grep "expression" "$x"; done
same as -exec
works but forks a process for each single file - slow
-exec and + or xargs do the job
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