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Thanks for the replies. Excuse my using wrong terminology - yes i was attempting a coprocess by "tailing" a log file and have its stdout be read by a read in the current script - something like...

Not sure why this does not work in bash:
tail -f err.log |&
-bash: syntax error near unexpected token `&'

I am attempting to continuously read a file that is being updated by doing a "tail -f"...