You might want to test if the variable is set first:
$ function ntest
> if not set -q NOT_SET_VARIABLE
> echo "not set"
> else if test -n $NOT_SET_VARIABLE
> echo "Non-zero"
> echo $NOT_SET_VARIABLE
> else
> echo "Zero length"
> end
> end
> $ set -e NOT_SET_VARIABLE
> $ ntest
> not set
> $ set NOT_SET_VARIABLE foo
> $ ntest
> Non-zero
> foo
> $ set NOT_SET_VARIABLE ""
> $ ntest
> Zero length
On Tue, Nov 11, 2014 at 4:37 PM, Marcin Zajączkowski <msz...@wp.pl> wrote:
> Hi,
>
> I wanted to write a script which display different prompt for session made
> through SSH. SSH should set SSH_CLIENT and SSH_TTY variables, so it should
> be easy to check. Unfortunately I am unable to write working if for those
> two cases. In the end it seem that even simple test with “-n” from manual
> (there with $MANPAGE) doesn’t work for me. Following function:
>
> function ntest
> if test -n $NOT_SET_VARIABLE
> echo "Non-zero"
> echo $NOT_SET_VARIABLE
> else
> echo "Zero length"
> end
> end
>
> returns:
>
> Non-zero
> <empty line>
>
> Of course variable is not set:
>
> $ echo $NOT_SET_VARIABLE
> <empty line>
>
> What is wrong in that code? How can I check if a variable is set?
>
> Fish 2.1.1, Fedora 21.
>
> Marcin
>
>
>
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