ssh passphrase

[Russell Coker <russell@coker.com.au>]

Is it possible to have the ssh client read the pass-phrase for an authorised
key from an environment variable?

What I want to do is:
export PASS=`ssh-askpass`
for n in $MACHINES do
  ssh $n command
done
unset PASS

Or something similar.  Basically I want to login to 30 machines and run some
command but without having to enter my pass-phrase 30 times.  I know I could
use expect (and will if no-one has a better suggestion).  But I'm sure there
is a better way (why else would ssh-askpass exist?).

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