Bash trick #48 while loop reading input from a file

bash_read_loop_stdin.sh

#!/bin/sh

# this loop uses "read" to parse stdin into variables
# stdin is specified at the ending "done" with < input_file, or
# in this case, an inline block of text.

while read host port; do
   echo "host $host port $port";
done << EOF
google.com 80
google.com 443
EOF