The Son of the Return of the SEG-Y Binary Header

A little more but a little more readable:


#!/bin/bash
echo -n "SEG-Y file name:  "
read _segyin


_jobid=$(hexdump -C -s 3200x -n 4 $_segyin | awk '{print $2 $3 $4 $5}')
_linenumber=$(hexdump -C -s 3204x -n 4 $_segyin | awk '{print $2 $3 $4 $5}')
_reelnumber=$(hexdump -C -s 3208x -n 4 $_segyin | awk '{print $2 $3 $4 $5}')
_tracesperrec=$(hexdump -C -s 3212x -n 2 $_segyin | awk '{print $2 $3}')
_auxtraces=$(hexdump -C -s 3214x -n 2 $_segyin | awk '{print $2 $3}')
_sampleinterval=$(hexdump -C -s 3216x -n 2 $_segyin | awk '{print $2 $3;}')
_samplespertrace=$(hexdump -C -s 3218x -n 2 $_segyin | awk '{print $2 $3;}')
_samplesperreel=$(hexdump -C -s 3220x -n 2 $_segyin | awk '{print $2 $3;}')
_filesize=$(stat -c%s $_segyin)
_formatcode=$(hexdump -C -s 3224x -n 2 $_segyin | awk '{print $2 $3;}')
_tracesortcode=$(hexdump -C -s 3228x -n 2 $_segyin | awk '{print $2 $3;}')
_feetmeters=$(hexdump -C -s 3254x -n 2 $_segyin | awk '{print $2 $3;}')


let decjobid=0x$_jobid
let declinenumber=0x$_linenumber
let decreelnumber=0x$_reelnumber
let dectracesperrec=0x$_tracesperrec
let decauxtraces=0x$_auxtraces
let decsampleinterval=0x$_sampleinterval
let decsamplespertrace=0x$_samplespertrace
let decsamplesperreel=0x$_samplesperreel
let dectracesortcode=0x$_tracesortcode
let decformatcode=0x$_formatcode
let decfeetmeters=0$_feetmeters


if [ $decformatcode = 3 ]; then
  let _bytespersample=2
else
  let _bytespersample=4
fi


let _bytespertrace=($decsamplespertrace*$_bytespersample)+240
let _minus=$_filesize-3600
let _numtraces=$_minus/$_bytespertrace


echo '************************'
echo 'Number of traces:  '$_numtraces


if [ $decjobid != 0 ]; then
  echo 'Job Id:  '$decjobid
fi
if [ $declinenumber != 0 ]; then
  echo 'Line number:  '$declinenumber
fi
if [ $decreelnumber != 0 ]; then
  echo 'Reel number:  '$decreelnumber
fi
if [ $dectracesperrec != 0 ]; then
  echo 'Traces per record:  '$dectracesperrec
fi
if [ $decauxtraces != 0 ]; then
  echo 'Number of aux traces per trace:  '$decauxtraces
fi
if [ $decsampleinterval != 0 ]; then
  echo 'Sample interval:  '$decsampleinterval
fi
if [ $decsamplespertrace != 0 ]; then
  echo 'Samples per trace:  '$decsamplespertrace
fi


if [ $decsamplesperreel != 0 ]; then
  echo 'Samples per reel:  '$decsamplesperreel
fi
if [ $decformatcode = 1 ]; then
  echo 'Format code:  4-byte IBM Floating Point'
fi
if [ $decformatcode = 2 ]; then
  echo 'Format code:  4-byte, twos complement integer'
fi
if [ $decformatcode = 3 ]; then
  echo 'Format code:  2-byte, twos complement integer'
fi
if [ $decformatcode = 4 ]; then
  echo 'Format code:  4-byte, fixed point with gain'
fi
if [ $decformatcode = 5 ]; then
  echo 'Format code:  4-byte IEEE floating point'
fi
if [ $decformatcode = 8 ]; then
  echo 'Format code:  1-byte, twos complement integer'
fi


if [ $dectracesortcode = 1 ]; then
  echo 'Trace sort code:  1 as recorded, no sorting'
fi
if [ $dectracesortcode = 2 ]; then
  echo 'Trace sort code:  2 CDP ensemble'
fi
if [ $dectracesortcode = 3 ]; then
  echo 'Trace sort code:  Single code continuous profile'
fi
if [ $dectracesortcode = 4 ]; then
  echo 'Trace sort code:  Horizontally stacked'
fi
if [ $dectracesortcode = 5 ]; then
  echo 'Trace sort code:  5 Common source point'
fi
if [ $dectracesortcode = 6 ]; then
  echo 'Trace sort code:  6 Common receiver point'
fi
if [ $dectracesortcode = 7 ]; then
  echo 'Trace sort code:  7 Common offset point'
fi
if [ $dectracesortcode = 8 ]; then
  echo 'Trace sort code:  8 Common mid-point'
fi
if [ $dectracesortcode = 9 ]; then
  echo 'Trace sort code:  9 Common conversion point'
fi
if [ $decfeetmeters = 1 ]; then
  echo 'Measurement system:  Meters'
fi
if [ $decfeetmeters = 2 ]; then
  echo 'Measurement system:  Feet'
fi
echo 'Dec filesize:  '$_filesize' bytes'
echo '************************'

---

You should get something that looks like this:

SEG-Y file name:  102.sgy
************************
Number of traces:  41047
Line number:  102
Reel number:  1
Traces per record:  1
Sample interval:  2000
Samples per reel:  1024
Format code:  4-byte IBM Floating Point
Measurement system:  Meters
Dec filesize:  9854992 bytes
************************

or on the rare occasion:


SEG-Y file name:  R_22.sgy
************************
Number of traces:  10122
Job Id:  666
Line number:  22
Reel number:  1
Traces per record:  1
Sample interval:  4000
Samples per trace:  2000
Samples per reel:  2001
Format code:  2-byte, twos complement integer
Trace sort code:  Horizontally stacked
Measurement system:  Meters
Dec filesize:  42924156 bytes
************************

La dee da!!