VTT字幕文件处理（vi + sed + awk）
Posted dingdingfish
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收到一个字幕文件，vtt后缀，部分内容如下：
00:00:00.030 --> 00:00:01.670 align:start position:0%
in<00:00:00.359><c> this</c><00:00:00.539><c> episode</c><00:00:00.989><c> we're</c><00:00:01.319><c> going</c><00:00:01.410><c> to</c><00:00:01.469><c> take</c><00:00:01.620><c> a</c>
00:00:01.670 --> 00:00:01.680 align:start position:0%
in this episode we're going to take a
00:00:01.680 --> 00:00:05.599 align:start position:0%
in this episode we're going to take a
step<00:00:01.979><c> into</c><00:00:02.280><c> the</c><00:00:02.659><c> unknown</c><00:00:03.980><c> it's</c><00:00:04.980><c> time</c><00:00:05.250><c> to</c><00:00:05.400><c> talk</c>
00:00:05.599 --> 00:00:05.609 align:start position:0%
step into the unknown it's time to talk
00:00:05.609 --> 00:00:13.039 align:start position:0%
step into the unknown it's time to talk
about<00:00:10.099><c> the</c><00:00:11.099><c> non</c><00:00:11.309><c> value</c><00:00:11.730><c> is</c><00:00:11.910><c> a</c><00:00:11.940><c> placeholder</c><00:00:12.360><c> for</c>
00:00:13.039 --> 00:00:13.049 align:start position:0%
about the non value is a placeholder for
00:00:13.049 --> 00:00:14.690 align:start position:0%
about the non value is a placeholder for
missing<00:00:13.440><c> or</c><00:00:13.710><c> not</c><00:00:13.980><c> applicable</c><00:00:14.190><c> information</c>
00:00:14.690 --> 00:00:14.700 align:start position:0%
missing or not applicable information
先用vi删除00:开始的行，命令为g/^00:/d；然后用vi去掉以</c>结束的行，命令为g/<\\/c>$/d，输出如下：
in this episode we're going to take a
in this episode we're going to take a
step into the unknown it's time to talk
step into the unknown it's time to talk
about the non value is a placeholder for
about the non value is a placeholder for
missing or not applicable information
使用sed去掉空行，命令为sed -r '/^\\s*$/d'，参考这里：
# sed -r '/^\\s*$/d' /tmp/1
in this episode we're going to take a
in this episode we're going to take a
step into the unknown it's time to talk
step into the unknown it's time to talk
about the non value is a placeholder for
about the non value is a placeholder for
missing or not applicable information
最后用awk删除连续的重复行，命令为awk '!x[$0]++'，参考这里，这命令牛：
in this episode we're going to take a
step into the unknown it's time to talk
about the non value is a placeholder for
missing or not applicable information
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