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#!/bin/env python
import sys
import struct
try:
f=open(sys.argv[1],'rb')
except (IOError,Exception):
print '''usage:
scriptname segyfilename
'''
sys.exit(1)
#skip EBCDIC header
try:
f.seek(3200)
except Exception:
print 'Oops! your file is broken..'
#read binary header
binhead = f.read(400)
ns = struct.unpack('>h',binhead[20:22])[0]
if ns < 0:
print 'file read error'
sys.exit(1)
#read trace header
while True:
trchead = f.read(240)
if trchead == '':
break
nav = trchead[224:228]+\
trchead[228:232]+\
trchead[200:204]+\
trchead[204:208]+\
trchead[60:64]
#define output format
nl = struct.unpack('>5i',nav)
print 'QL%-4d%9s%10.2f%10.2f%5s' % (nl[0], nl[1], nl[2]/100.0, nl[3]/100.0, nl[4])
f.seek(ns*4,1)
f.close()
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