freebsd-dev/release/scripts/doc-install.sh

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#!/bin/sh
#
if [ "`id -u`" != "0" ]; then
echo "Sorry, this must be done as root."
exit 1
fi
echo "You are about to extract the doc distribution into / - are you SURE"
echo -n "you want to do this over your installed system (y/n)? "
read ans
if [ "$ans" = "y" ]; then
cat doc.?? | tar --unlink -xpzf - -C /
fi