peter@aucs.AcadiaU.ca (Peter Steele) (06/05/91)
I want to modify our system startup scripts to ask a question like Okay to bring up databases (y/n)? and if there is no reply within, say 5 seconds, assume "y". Can I do this from sh or csh or do I have to write a C program to do the I/O? If a C program is required, can someone point me to the best reference on how to do non-blocking I/O? Thanks. -- Peter Steele Postmaster peter.steele@acadiau.ca Tel: 902-542-2201 Software Analyst, Acadia University, Wolfville, NS Fax: 902-542-7224
Dan_Jacobson@ATT.COM (06/12/91)
>>>>> "Peter" == Peter Steele <peter@aucs.acadiau.ca> writes:
Peter> I want to modify our system startup scripts to ask a question like
Peter> Okay to bring up databases (y/n)?
Peter> and if there is no reply within, say 5 seconds, assume "y". Can
Peter> I do this from sh or csh
Most major dudes [<- Steely Dan musical reference there] frown upon
csh, so that leaves sh. This works in ksh & sh, so it probably works
in bash too (note SYS Vish "\c" for echo though... no big deal)
#just examples
program="screen -r || screen" #maybe set this in a case statement
test -n "$program" &&
sec=8 &&
trap 'trap 2' 2 &&
echo "you got $sec seconds to interrupt before
\"$program\"... \c" &&
sleep $sec &&
trap 2 &&
eval $program