Detect BSD Libraries installed in OSX?

[RGould8 at aol.com]

I'm afraid I'm not getting this at all (which could be due to the fact that I 
don't know unix).   I've tried the

# which which

and the 

/usr/bin/which

calls, and all I get is command not found errors.   Can you tell me more 
about what the unix command would be to determine if the BSD.pkg file exists?

In a message dated 6/4/03 12:01:55 AM, alrice at ARCplanning.com writes:


> I haven't tested this, but guessing you could check for the existence
> of /Library/Receipts/BSD.pkg
> 
> However, it would be more robust to check for existence command before
> you use shell(). The user could have modified the contents of
> /usr/bin/. This might be especially common among users of Fink who
> install bunches of stuff into /sw/bin. Maybe they leave /usr/bin alone
> and just change their path, or maybe they delete stuff? To be really
> robust, use which to locate the command in question:
> 
> # which which
> /usr/bin/which
> 
> Unix is so weird! :-)
> 

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