CentOS 7.0 - man page for pnmtofits (centos section 1)
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pnmtofits - replaced by pamtofits
This program is part of Netpbm(1) In Netpbm 10.30 (October 2005), pnmtofits was extended
and renamed to pamtofits(1)
pamtofits is backward compatible with pnmtofits.
netpbm documentation September 2005 pnmtofits(1)