.TH OII 1df "November 2017" "Manual page for oii" .SH NAME .B oii \- run a command on input only if there's at least one byte of input .SH USAGE .B oii CMD [ARGS ...] < file .br program | .B oii CMD [ARGS ...] .SH DESCRIPTION Run the given program passing in stdin but only if at least one byte of input is actually received, rather like the -E switch to mail(1) behaves on bsd-mailx. If no input is received, exit silently with an error status. .SH AUTHOR Tom Ryder