bext infile extsw value infile = input file name extsw = extraction switch (1 char) s= shot name r= receiver name f= field record number value = shot or rec name (4 char) or field record number (int) WARNING: leading blanks are important (enclose 4 char string in quotes if on command line) Use bdump program to find names of shots or receivers
For example, consider extracting the traces with receiver label 30 in a file with two shots.
bext merged.seg r " 030"
A partial dump of the headers for merged.seg is:
30 | 8|8001 030| 148.53| 1000.50 9938.79 9800.50| 1|0.0514| 40 | 0| 0| 78 | 9|9048 030| 85.15| 1000.50 9938.79 9800.50| 1|0.0386| 40 | 0| 0|This shows that traces 30 and 78 are at receiver name “ 030” and have the same (x,y,z) coordinates.
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