[GRASSLIST:2914] Puzzling mapcalc command

[SWlab]

Hello,
I want to compute some maps with mapcalc (GRASS53 v2004/03.. on a SuSE box). 
Depending on the way I parse the info to the command I have results or none

If I have a file "tmp" with
Vold=V
V=V+Down.0
Down=1
V=V-Down
Out=2
In=100000.*On.NN*Out[-1,0]

the command "cat tmp | r.mapcalc" gives me:
parse error, unexpected '[', expecting $end
Parse error

The commands entered one by one gives satisfactory results (in particular,
r.mapcalc "In=100000.*On.NN*Out[-1,0]"
or
echo "In=100000.*On.NN*Out[-1,0]" | r.mapcalc
both works.

I'd be very happy to get any insight :)

Thx a lot in advance
P.



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