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