while删除空行，并打印非空尾行

打印非空尾行，sed -n '$p' $file

#!/bin/sh
file=$1
if [[ -z $1 ]];then
echo Usage $0 file;
exit 0;
fi
while [[ -z $tt ]];do
tt=$(sed -n '$p' $file)
if [[ -z $tt ]];then
sed -i '$d' $file
fi
done
sed -n '$p' $file

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