给定以下格式的日志
2009-11-11 13:13:44,716 INFO Something happened : problem description . Waited 3 seconds 2009-11-11 13:23:44,716 INFO Something happened : problem description . Waited 1 second 2009-11-11 13:33:44,716 INFO Something happened : some other problem description . 我怎样才能提取之间的string:和. ？
也许：
<logfile sed -e"s/^.* : \(.*\) \..*/\1/"
cat logfile | cut -f1 -d. | cut -f4 -d: