#! /bin/bash
cat /tmp/passwd | while read line
do
echo "$line"
done
echo "========================================="
exec < /tmp/passwd
while read line;do
echo "$line"
done
echo "============================================"
while read line;do
echo "$line"
done</tmp/passwd
echo "++++++++++++++++++++++++++++"
Three methods to read file
原文：http://blog.51cto.com/546136/2064889
