文件中有很多行，如下所示：
000100667 ===> 000102833
005843000 ===> 005844000
011248375 ===> 011251958
我想在数字中插入特定的分隔符，如下所示：
00:01:00,667 ===> 00:01:02,833
00:58:43,000 ===> 00:58:44,000
01:12:48,375 ===> 01:12:51,958
现在我正在尝试（仅第一部分成功）：
echo 000100667 | gawk '{printf "%s:%s:%s,%s\n", $1, $2, $3, $4}' FIELDWIDTHS="2 2 2 3"
我有一个包含多行的文件，并且仅当它们符合特定模式时我才想连接行。我知道我可以加入这些行，例如：
$ cat input.txt
1
00:02:34,654 --> 00:02:36,554
Sean, let's go.
2
00:02:38,358 --> 00:02:40,724
Yeah. Detective. we got
a possible 1 87 out on Route 59.
3
00:03:04,584 --> 00:03:06,051
Right this way.
4
00:05:01,301 --> 00:05:03,269
How long has this been here?./
Tuesday.
$ cat input.txt | perl -00 -lpe '$i = 0; s/\n/(++$i > 2) ? " " : "\n"/ge'
1
00:02:34,654 --> 00:02:36,554
Sean, let's go.
2
00:02:38,358 --> 00:02:40,724
Yeah. Detective. we got a possible 1 87 out on Route 59.
3
00:03:04,584 --> 00:03:06,051
Right this way.
4
00:05:01,301 --> 00:05:03,269
How long has this been here?./ Tuesday.
但是，我该如何解决该线是否符合模式（仅当它们有一个'/'）？所以在这种情况下，我想要实现的输出是：
1
00:02:34,654 --> 00:02:36,554
Sean, let's go.
2
00:02:38,358 --> 00:02:40,724
Yeah. Detective. we got
a possible 1 87 out on Route 59.
3
00:03:04,584 --> 00:03:06,051
Right this way.
4
00:05:01,301 --> 00:05:03,269
How long has this been here?./ Tuesday.