Program sfheaderattr | Display header attributes. 
[SYNOPSIS]
sfheaderattr < head.rsf segy=y desc=n
[COMMENTS]

Only nonzero values are reported.

[PARAMETERS]
bool    | desc | =n |  [y/n] | 	if describe keys 
bool    | segy | =y |  [y/n] | 	if SEGY headers 
[DIRECTORY]
system/seismic
