topic Re: while loop in Operating System - HP-UX

while loop

Donald C Nelson — Fri, 11 Feb 2005 15:33:40 GMT

I am using this for loop to create volume groups and it works just fine, but if an admin types something else besides 4,8,16 or 32, it will blow up. How can I setup a while loop to make sure they only input 4,8,16,32

echo -n "Please enter the number of physcial extents for the vgcreate (4,8,16, etc): "
read pe
for i in 2 3 4 5 6
do
echo "...Creating volume group vg0$i..."
vgcreate -s $pe $i `cat $target_dir/vg0$i.out`
done

Re: while loop

RAC_1 — Fri, 11 Feb 2005 15:49:02 GMT

read pe
after this add
if [ ${pe} -eq "4" -o ${pe} -eq "8" -o ${pe} -eq "16" -o ${pe} -eq "32" ];then
for i in 2 3 4 5 6
do
echo "...Creating volume group vg0$i..."
vgcreate -s $pe $i `cat $target_dir/vg0$i.out`
done
else
echo "bad Choice"
exit 1

Re: while loop

A. Clay Stephenson — Fri, 11 Feb 2005 15:49:05 GMT

There are a number of ways to attack this but the case statement is an easy approach:

read pe
case "${pe}" in
4|8|16|32);;
*) echo "Invalid input" >&2
exit 255;;
esac
for i ....

Re: while loop

Donald C Nelson — Fri, 11 Feb 2005 15:54:29 GMT

The case statement will work for me. Thanks
Clay, but I need for it to loop back to another response. Is there a command I can put in after the "Invalid Choice"

Re: while loop

A. Clay Stephenson — Fri, 11 Feb 2005 16:44:40 GMT

Does a hog like slop?

OK=0
until [[ ${OK} -ne 0 ]]
do
read pe
case "${pe}" in
4|8|16|32) OK=1
;;
*) echo "Invalid input" >&2
;;
esac
done

for i ....

Re: while loop

Donald C Nelson — Fri, 11 Feb 2005 16:49:38 GMT

Thanks Clay, right when I sent the reply, I found my answer.