lsh - List stuff from the first and last headers of an SEG-Y disk file

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Program:  lsh
Purpose:  List stuff from the first and last headers of an SEG-Y disk file.
Usage: lsh (list SEG-Y disk file) usage: lsh filename
Example:
71>lsh 0010_2307_LF.sgy
0010_2307_LF.sgy          Starts: day271 2307z, Ends: day272 0634z, data times:  0.000 to  7.000 secs.