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How does the input-line test work?

From: Hector Chu
Subject: How does the input-line test work?
Date: Fri, 29 Aug 2008 20:47:33 +0100

input-line.sh is:

bash ./input-line.sub
this line for input-line.sub

with input-line.sub being:

read line
echo line read by $0 was \`$line\'

The test is run by executing: bash < input-line.sh.

How does input-line.sub manage to read from the correct point in the
input file? Doesn't the parent bash read the whole lot into its
buffer, so that the child bash starts reading from the end of the

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