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#!/bin/sh

...
    sleep 10
    echo With newline
done

local $SIG{ALRM} = sub { kill HUP => $pid; die "No data\n" };

local $SIG{ALRM} = sub { alarm 0; print "No data\n"; alarm $timeout };

With newline
With newline
...
No data
No data
NO newlineWith newline