Shell Programming and Scripting

Hi,
in my korn shell I have this code:

typeset -uL1 rc
read rc?"Insert Y=Yes (default) or N=No >>"

If I press enter without value I wish to set rc=Y. This is my default.

This test: if [[ -z $rc ]] then .... Do not work.

I hope in your help. Thanks in advance.

Regards,

Giovanni

I just tested this line:

read rc?"Insert Y=Yes (default) or N=No >>"; if [[ -z $rc ]]; then echo "nothing entered"; fi

and it worked fine for me. Is that a typo, or did you forget to enter a semicolon before "then" ? What kind of error are you getting?

the following will assign Y to variable rc if it is null.

${rc:=Y}

Hi,

If you want good robust code you should put the read
in a loop and test that you have gotten the desired
values.

Do something like the following:

#!/usr/bin/ksh

exit_read=0
while [ $exit_read = 0 ]; do
read rc?"Insert Y=Yes (default) or N=No >>"
if [[ -z $rc ]]; then
rc='y';
fi
case $rc in
y* | Y*)
exit_read=1
;;
n* | N*)
exit_read=1
;;
esac
done

echo $rc



- Finnbarr