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dirrrty: use -p to chomp automatically, substitute all newlines away and then replace the "---" by a newline ? bingo!
s/// => s/// is just a cooler way to write s///, s/// which is just the small brother of s///; s/// (comma is an operator!)
There is 1 alternative - vote for the best!
the output of svn log is annoying to grep, since it spreads the useful info over multiple lines. This compacts the output down to one line so eg you can grep for a comment and see the rev, date & committer straight away.
Updated: MUCH shorter, easier to remember. Now it just replaces newlines with spaces, except on '---' lines.
If you can do better, submit your command here.
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