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Again longhand to demonstrate...
Last login: Mon Sep 23 14:05:22 on ttys000
AMIGA:barrywalker~> text="This is a line."
AMIGA:barrywalker~> echo -n "$text" > /tmp/txt
AMIGA:barrywalker~> read...

echo prints its arguments, not its stdin.
You can use xargs to transform stdin to arguments
xargs -i echo {} < file.txt
or simply
cat file.txt

A starter for you:-

OSX 10.7.5, default bash terminal done longhand...
Last login: Mon Sep 23 09:11:17 on console
AMIGA:barrywalker~> text="This is a line."
AMIGA:barrywalker~> echo -n "$text"...