Date: Wed, 29 Aug 2001 18:14:15 +0200 From: Stijn Hoop <stijn@win.tue.nl> To: Odhiambo Washington <wash@wananchi.com> Cc: Giorgos Keramidas <keramida@ceid.upatras.gr>, FBSD-Q <freebsd-questions@freebsd.org> Subject: Re: another easy one for the script gurus Message-ID: <20010829181415.B21660@pcwin002.win.tue.nl> In-Reply-To: <20010829180839.F7356@ns2.wananchi.com>; from wash@wananchi.com on Wed, Aug 29, 2001 at 06:08:39PM %2B0300 References: <20010828191422.P14463@ns2.wananchi.com> <20010828233939.A12493@hades.hell.gr> <20010829180839.F7356@ns2.wananchi.com>
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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).
--Stijn
--
Tact, n.:
The unsaid part of what you're thinking.
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