make ".if exists" problem/question
M. Warner Losh
imp at bsdimp.com
Fri Aug 26 05:55:22 GMT 2005
Yes. The thing to keep in mind is that much of the .if stuff is done
at parsing or rule construction time. So if you change something
(creating a file, say), then that condition won't be re-evaluated.
For the specific example given, one could replace much of the goo
if you wanted to create foobar. Otherwise, I'd be tempted not to use
.if exists. I'd be tempted to do something more like:
@-if [ -f foobar ]; then cat foobar; else touch foobar; fi
where you have the shell check.
The primary use of exists() I've seen is:
although I have seen others.
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