Question

There have a million webpages, each page may have some phone numbers with two
formats (XXX)XXX-XXXX, XXX-XXX-XXXX, how to find them out and update them into a unified format, i.e., 1-xxx-xxx-xxxx. How to do that using Linux or Unix commands?

Answer 1

 cat ph.txt  
111-222-3333-4444
(222)-234-2932-2929
212-939-2929-2929

using sed you can change millon webpages

 cat ph.txt  | sed -e 's/^(//;s/)//;s/^/1-/'
1-111-222-3333-4444
1-222-234-2932-2929
1-212-939-2929-2929

for all html files

find dirname -type f -name "*.html" -exec sed -e 's/^(//;s/)//;s/^/1-/' {} \;