check if a variable is not affected

Shell Programming and Scripting
1

Hi all,

to check that a variable is not empty, I usually do:

if [ -z "$a" ]; then...
or
if [ -n "$a" ]; then...

what if I have a serie of variables and want to do the same test on all of them. How to do this in a single if statement?

thank you

2

You can try using loops. For eg:


for i in <list of variables>
do
  if [ -z $i ] then
    do something;
  else
    do something;
done

HTH,:cool:

Regards,

Praveen