Testing for non-empty wildcards
Paul Fox
fox at marlow.uucp
Sun Dec 4 05:27:21 AEST 1988
Hello wide world...yet another boring shell question.
Given that in the C-shell you can do things like:
if ( -e ...long..file..spec ) ...
is there a way to test whether a sub-directory contains any
wild-carded files. What I mean is, I have a subdirectory 'sccs'
in each of my development directories. I have a shell script 'sccs'
in /usr/local/bin which does some nice but useful things with the
sccs commands. I can do something like:
sccs update
which translates into:
foreach i (sccs/p.*)
set file = something_horrible
delta sccs/s.$file
get sccs/s.$file
end
The problem I have is that if there are no sccs/p.* files, then
cshell complains that there is a wildcard mismatch.
My current hack is the following:
set nonomatch
set a = sccs/p.*
if ( "$a" == "sccs/p.*" ) exit 0
which relies on the fact that if nonomatch is set, then '*' evaluates
to '*' if the wildcard fails. I think this is horrible, and may have
nasty side effects.
How does one do this properly in the C-shell & Bourne Shell.
(I am not particularly interested in the K-sh since I need portability.
Yes I know C-shell is not available on all systems, but it is
available on more systems that K-sh).
Many thanks
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