[newbie] SGML files

[Bob Springett]

I'm using Mandrake 5.3. According to package manager sgml-tools is
installed, I assume O.K.
however when I try to read a sgml file like this 'sgml2txt foo.sgml ' I get
lots of error messages saying it can't find various files. Can someone tell
me how to access these files, please.
Regards
Bob