Question

I am having a bash script which is something like following,

cat filename | while read line
do
    read input;
    echo $input;
done

but this is clearly not giving me the right output as when I do read in the while loop it tries to read from the file filename because of the possible I/O redirection.

Any other way of doing the same?

Answer 1

Read from the controlling terminal device:

read input </dev/tty

more info: http://compgroups.net/comp.unix.shell/Fixing-stdin-inside-a-redirected-loop