Question

I have the following (part of big ksh script)

 while [[ $? -ne 0 ]]
  do

    print -n "ENTER VALID HOST IP"
     read IP
     CHECK_IP $IP   # CHECK_IP is afuntion that check if IP is valid and return 0 or 1
     done

as we see in the while the $? is always equal to 0
so we cant ask for the IP

the target of the loop is to ask IP address
and activate CHECK_IP function in order to return 0 or 1

0 for valid IP

1 for BAD IP

but as I said in the begging I never asked about IP because $? always 0 (after “while” )

so my question

How to enable default 1 to $? so I will start the loop , or other suggestion?

lidai

Answer 1

Run false first.