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Re: Comparing strings

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In message <scl09g$23t$1@dont-email.me> Michael F. Stemper <michael.stemper@gmail.com> wrote:
> On 13/07/2021 12.46, ELCV wrote:

>> If I do this:
>> 
>> if [ "$1" != "FOO" ];
>>   then
>>         echo "I can backup the 2nd volume";
>> else
>>          exit;
>> fi
>> 
>> It works. But if I add an "or" condition as follows:
>> 
>> if [ "$1" != "FOO" ]   ||  [ "$1" != "BAR" ] ;

> I've never seen this syntax. I always thought that the "or"
> needed to be within the test, as in:

> if [[ "$1" != "FOO" ||$1 != "BAR" ]]

There's a difference between [[ ]] and [ ] ([[ ]] is superior and you
should probably just get used to using [[ ]] exclusively).

But the syntax used in the sample above is incorrect, i believe, as
single brackets require that you use -o for or.

you really only need to deal with single [ ] if you want to be
compatible with sh.

-- 
"Are you pondering what I'm pondering?"
"I think so, but where is a fish?"

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Comparing strings ELCV <clsamcmaster@gmail.com> - 2021-07-13 10:46 -0700
  Re: Comparing strings Grant Taylor <gtaylor@tnetconsulting.net> - 2021-07-13 14:29 -0600
    Re: Comparing strings Lewis <g.kreme@kreme.dont-email.me> - 2021-07-13 21:00 +0000
    Re: Comparing strings ELCV <clsamcmaster@gmail.com> - 2021-07-13 18:53 -0700
      Re: Comparing strings ELCV <clsamcmaster@gmail.com> - 2021-07-14 08:42 -0700
        Re: Comparing strings Grant Taylor <gtaylor@tnetconsulting.net> - 2021-07-14 09:58 -0600
          Re: Comparing strings ELCV <clsamcmaster@gmail.com> - 2021-07-14 10:09 -0700
            Re: Comparing strings Grant Taylor <gtaylor@tnetconsulting.net> - 2021-07-14 11:37 -0600
        Re: Comparing strings Lewis <g.kreme@kreme.dont-email.me> - 2021-07-14 23:34 +0000
  Re: Comparing strings "Michael F. Stemper" <michael.stemper@gmail.com> - 2021-07-13 16:23 -0500
    Re: Comparing strings Lewis <g.kreme@kreme.dont-email.me> - 2021-07-14 00:07 +0000

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