Date: Thu, 30 Aug 2001 00:06:55 +0300 From: Giorgos Keramidas <keramida@ceid.upatras.gr> To: Stijn Hoop <stijn@win.tue.nl> Cc: Odhiambo Washington <wash@wananchi.com>, FBSD-Q <freebsd-questions@freebsd.org> Subject: Re: another easy one for the script gurus Message-ID: <20010830000655.A5211@hades.hell.gr> In-Reply-To: <20010829181415.B21660@pcwin002.win.tue.nl>; from stijn@win.tue.nl on Wed, Aug 29, 2001 at 06:14:15PM %2B0200 References: <20010828191422.P14463@ns2.wananchi.com> <20010828233939.A12493@hades.hell.gr> <20010829180839.F7356@ns2.wananchi.com> <20010829181415.B21660@pcwin002.win.tue.nl>
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From: Stijn Hoop <stijn@win.tue.nl>
Subject: Re: another easy one for the script gurus
Date: Wed, Aug 29, 2001 at 06:14:15PM +0200
> On Wed, Aug 29, 2001 at 06:08:39PM +0300, Odhiambo Washington wrote:
> > |
> > | You want in your Makefile something along the lines of:
> > |
> > | somefilename:
> > | awk -F: '{print $$1,$$2}' < /etc/master.passwd > $@
> > |
> >
> > ##
> > authtab:
> > cat master.passwd.test | awk -F ":" '{if ($3>999) {print $1":"$2}}'
> > ##
> > In all that I expect it to generate the file called authtab.
> >
> > If I try your redirects (BTW what does $@ represent?) It generates errors
> >
> > alligator# make
> > awk -F ":" '{if (>999) {print ":"}}' < master.passwd.test > authtab
> > awk: cmd. line:1: {if (>999) {print ":"}}
> > awk: cmd. line:1: ^ syntax error
> > *** Error code 1
> > Stop in /etc/Exim.
> >
> > I don't get where the $3 disappears to.
>
> make also interprets variables, and those always happen to start with a
> '$' by convention. make reads your line as having the variable $3 in it
> which isn't defined, so it has the value ''. You need to double the $'s
> for make to not interpret them.
>
> Also, having a target doesn't instruct make to automatically create a
> file named like that; you have to explicitly redirect the output from
> awk to a file named 'authtab', or to $@ which is a make variable meaning
> 'the name of the current target'.
>
> Something like this should work better:
>
> authtab:
> umask 077; cat master.passwd.test | \
> awk -F ":" '{if ($$3>999) {print $$1":"$$2}}' > $@
>
> (Giorgios also posted a version of this above).
Yes, the doubling of the '$' signs was intentional in my post.
Washington, try duplicating the '$' signs that you want passed as
single '$' signs in your Makefiles.
-giorgos
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