Bash: reading lines

Reading lines from a $FILE in bash:

while read LINE
do
    echo "$LINE"
done < $FILE

Reading from standard input:

while read LINE
do
    echo "$LINE"
done <&0

Reading lines from a file as a script parameter, and if it's not found, from standard input:

while read LINE
do
    echo "$LINE"
done < "${1:-/dev/stdin}"

Source: http://mywiki.wooledge.org/BashFAQ/024