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Date: Tue, 10 Aug 2010 10:10:51 -0300
Message-ID: <AANLkTin3LJ=q1gTjAT8r80bZwC9C=ahWjNKRfsC=c6--@mail.gmail.com>
From: "Federico G. Benavento" <benavento@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
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Subject: Re: [9fans] regexp metacharacter difficulty inside grap
Topicbox-Message-UUID: 469733b0-ead6-11e9-9d60-3106f5b1d025

this is probably related to the fact that grap(1) is an APE program,
and sh actually execs sh, not rc...

On Tue, Aug 10, 2010 at 2:23 AM, Jeff Sickel <jas@corpus-callosum.com> wrot=
e:
> I've been trying to figure out this little one for a while now and figure=
 I could use a refresher course in regexp.
>
> There are quite a few files that I'm trying to copy through grap that wou=
ld be really easy if I could take a line like:
>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0# (Yo 4.9534)
>
> and turn it into a value for x,y graphing. =C2=A0Unfortunately, I'm compl=
etely blanking out on how to get that pesky ')' stripped out. =C2=A0I try t=
he following:
>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0if "$2" =3D=3D "(Yo" then {
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0print sprintf("Yo =
was %f", yo)
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 yo =3D sh { echo =
$3 | sed 's/\)#//' }
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 print sprintf("Yo=
 is %f", yo)
> =C2=A0 =C2=A0 =C2=A0 =C2=A0}
>
> but that just gives me:
>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0cpu% eval `{doctype t.g} | lp -dstdout > t.ps
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Yo was 8.579000
> =C2=A0 =C2=A0 =C2=A0 =C2=A0rc: line 2: token ')': syntax error
> =C2=A0 =C2=A0 =C2=A0 =C2=A0grap: syntax error???: No such file or directo=
ry
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 near 20100809_pscheck_XX.d:8
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 context is
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0yo =3D sh { echo 4=
.9534)# | sed 's/\)#//' } >>> <<<
>
>
> I'm not quite sure why grap converts $3 into "4.9534)#", so I try brute f=
orce:
>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0cpu% echo '4.9534)#' | sed 's/\)#//'
> =C2=A0 =C2=A0 =C2=A0 =C2=A04.9534
>
>
> Does anyone have any hints on what might I be doing wrong in my grap sour=
ce?
>
> -jas
>
>
>



--=20
Federico G. Benavento