Use "--" (double-dash), which is used to indicate the end of command
options, after which only positional parameters are accepted.
This works:
set firstChar (string sub -s1 -l1 -- "$text")
On Sun, Sep 24, 2017 at 5:47 PM, Mark Volkmann <r.mark.volkm...@gmail.com>
wrote:
>
> Suppose I have this:
> set text '-foo'
>
> How can I determine whether the first character of the string in $text is
a dash?
> I tried this:
> set firstChar (string sub -s1 -l1 "$text")
>
> But that doesn't work because "string sub" thinks I'm trying to specify
another switch since $text starts with a dash, and of course "-foo" is not
a valid switch for "string sub".
>
> --
> R. Mark Volkmann
> Object Computing, Inc.
>
>
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