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sed 's/(\<\/?)a\>/ab\>\1ab\>/g' yourfile, though that would get <a></a> that was outside <start> as well...
sed 's/(\<\/?)a\>/ab\>\1ab\>/g' yourfile
<a></a>
<start>
sed 's/a\>/ab\>/g' yourfile, though that would get <a></a> that was outside <start> as well...
sed 's/a\>/ab\>/g' yourfile
sed 's/(\<\/?)a\>/\1ab\>/g' yourfile, though that would get <a></a> that was outside <start> as well...
sed 's/(\<\/?)a\>/\1ab\>/g' yourfile
