How do I add results of wc -l

[Paul Middleton]

This is really dumb, but my brain hit a bad sector and I can't remember how to do this.
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I have a short program to see how many power supplies are in a Nike. I use cstm and put results in a file. From the file is use a simple instruction -
psa=$(cat file|grep -c "VSC A: OK"|wc -l)
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when I'm done looking for VSC A, B, C - I'm trying to get a total number of power supplies, since the customer have several Mod 20 units.
I've tried several commands to try and total the power supplies, but the output keeps coming back as "+1+1+1 etc".
Does anyone know a simple way to add $psa $psb and $psc to get a total?
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I'm very generous with the points. Promise.
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Regards,
Paul Middleton

[A. Clay Stephenson · Accepted solution]

You're making this too hard. The POSIX (and Korn) shell have built in integer math.

viz

X=$((${A} + ${B} + ${C}))
or
X=$((${A} * 3 + 7))

You also have the ability to nest using ()'s. the key is
$(( )) -- it's equivalent to the let statement but is much cleaner.

[Jeff Schussele]

Hi Paul,

Many ways to do it - here's one

(($total=$psa+$psb+$psc))

$total will now contain the sum.

Rgds,
Jeff

[Jeff Schussele]

Sorry....should be total NOT $total...fat fingered that one

Jeff

[Tony Contratto]

Hi Paul,


# cat tmp.sh
#!/usr/bin/ksh

psa=2
psb=3
psc=4

echo $(( $psa + $psb + $psc ))

# ./tmp.sh
9


Hope this helps...
Tony

[Paul Middleton]

Thanks for the information. Sometimes I make the problem harder than it is.
After 28 years in the field with hardware repairs, going into a supervisor position and working with HP-UX scripts is harder than I thought.
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Wait a minute - if I had thought about it, I wouldn't be doing it.
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Regards, and thanks again,
Paul Middleton