bash conditionals - if two variables are equal to a string... [solved]

graysky · 2010-10-09 20:12:37

I have two variables in a script: $a and $b

They are set to either "y" or "n" by the user - I need a conditional to break the script if the users sets them both to "y"

This doesn't work but you get the idea:

if [ $a = "y" && $b = "y" ]; then
exit
fi

What is the right syntax to accomplish this? The other three combinations are fine (nn, ny, and yn).

Last edited by graysky (2010-10-09 21:33:05)

olvar · 2010-10-09 20:19:33

man test:

 if [ "x$a" = "xy" -a "x$b" = "xy" ]; then
   exit
fi

Edit: the "x" before the variables is to ensure nothing funny happens if the variables haven't been asigned.

Last edited by olvar (2010-10-09 20:21:55)

karol · 2010-10-09 20:26:15

Last edited by karol (2010-10-09 20:34:40)

graysky · 2010-10-09 21:32:53

Thanks olvar and karol - very informative link in that wiki.

olvar · 2010-10-10 00:17:17

Oops... sorry for promoting my bad habits

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