Question

KSH – HP-SOL-Lin
Needs to be POSIX

I want to test if multiple conditions are true, then do something.

Assumptions:

• FIELDS=0
• $STRING='' or $STRING=' '

Right now I have:

if [[ $FIELDS -ne 0 && ! -z $STRING ]]; do

This works fine, if $STRING is null, but sometimes it has a single space. How can I make process the two $STRING tests first? Conceptually, I would like equivalent of:

[[ $FIELDS -ne 0 && [ ! -z $STRING || $STRING = ' ' ]  ]]

Answer 1

You can separate the tests:

if [[ $FIELDS -ne 0  ]]; then
  if [[ ! -z $STRING || $STRING == ' ' ]]; then
    do some stuff
  fi
fi