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From: meissner@dg_rtp.UUCP (Michael Meissner)
Newsgroups: net.unix
Subject: Re: Wildcard-specs
Message-ID: <643@dg_rtp.UUCP>
Date: Wed, 15-Oct-86 10:42:08 EDT
Article-I.D.: dg_rtp.643
Posted: Wed Oct 15 10:42:08 1986
Date-Received: Thu, 16-Oct-86 22:08:59 EDT
References: <4142@brl-smoke.ARPA> <191@hwee.UUCP>
Reply-To: meissner@dg_rtp.UUCP (Michael Meissner)
Distribution: net
Organization: Data General (Languages @ Research Triangle Park, NC.)
Lines: 42

In article <191@hwee.UUCP> hmc@hwee.uucp (Hugh Conner) writes:
> In article <4142@brl-smoke.ARPA> VERACSD@usc-isi.arpa writes:
>>Does UNIX support recursive directory-level matching?  i. e. Does it allow one
>>to wildcard-specify all files in a dir as well as all files in the dir's
>>subdirectories?  cf. the use of "**" in Symbolics' pathnames.
>
> We've had discussions about this at meetings of our Local user group. It is
> one feature which we all agree is lacking. Unfortunately we cannot agree on a
> neat, workable, solution. Suggestions include using ** as mentioned above,
> making * match subdirectories as well (it does in cpio), among others. I'd
> be interested to know if anyone has other solutions, and if anyone has actually
> implemented it.

   I use Data General's AOS/VS operating system, as well as our UNIX(es), and
this is an area where each system has some concepts that the other could
pick up.  In this case, AOS/VS has the following wildcard characters:

	+	Match any string except a directory separator (* in UNIX).
	-	Match any string except a directory separator that doesn't
		contain a period.
	*	Match any single character except a directory separator or a
		a period (somewhat like in UNIX).
	#	Match all files in subordinate directories.
	\	Omit a given pattern from being matched.
	:	Directory separtor (/ in UNIX).

Thus, if I wanted to match all of the C files, except those that begin with
z, I would specify the pattern:

	cmd #:+.c\z+

Obviously if such a scheme were to be put into UNIX, the characters used
would have to be changed (\ in particular).  However, the # and the \ wild-
cards are VERY powerful.

    To get the same effect in UNIX as the wildcard above, I would have to do
something like:

	find . -type f -name "\.c$" -print | egrep -v "^z" | xargs cmd

	Michael Meissner, Data General
	...{ decvax, ucbvax, inhp4 }!mcnc!rti-sel!dg_rtp!meissner