Hi,
I'd like to detect in a lua script on which (kind of) operating system
I'm running, in order to provide sensible defaults for calls to
external
programs (viewers, actually). Thinking about OS X, I considered
if os.execute('nothere 2>/dev/null') / 256 == 127 then
print("does not exist")
end
and got the answer
/dev/null works on UNIX, on Windows it's nul (and does not appear in
the filesystem). However, another nice solution would be to walk
through the path (os.getenv("PATH")). With other words, write a
function which does the same as the UNIX which command.
Note that paths are separated by ";" on Windows instead of ":".
Which brings me to the question, is there some code snippet which I
could use?
Regards, Frank
--
Frank Küster
Single Molecule Spectroscopy, Protein Folding @ Inst. f. Biochemie,
Univ. Zürich
Debian Developer (teTeX/TeXLive)
