Question

I run a program that generates a line of output every second. Each time a new line is generated I need to save it (and only it) into a particular text file. When a new line is generated the file must be overwritten with the new line.

I think it must be very simple solution but I can’t figure it out using my poor knowledge of the shell commands.

Thanks!

Answer 1

Something like this would be one possible solution

./your_program | (while true; do read tmp && echo "$tmp" > $file; done)

where $file is your file.