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Re: Quoting and string comparison


From: Clark Wang
Subject: Re: Quoting and string comparison
Date: Thu, 8 Feb 2018 22:24:49 +0800

On Thu, Feb 8, 2018 at 9:05 PM, Jaan Vajakas <address@hidden> wrote:

> Hi!
>
> I noticed a weird behavior. Is it a bug?
>
> Namely, why does
>
> echo "$(for f in a b c; do if [[ \"$f\" > b ]]; then echo "$f > b"; else
> echo "$f <= b"; fi; done)"
>

Should be:

  echo "$(for f in a b c; do if [[ $f > b ]]; then echo "$f > b"; else echo
"$f <= b"; fi; done)"


> output
>
> a <= b
> b > b
> c > b
>
> ?
>
> I would have expected the same output as one of
> echo "$(for f in a b c; do if [[ "$f" > b ]]; then echo "$f > b"; else echo
> "$f <= b"; fi; done)"
> echo "$(for f in a b c; do if [[ '"$f"' > b ]]; then echo "$f > b"; else
> echo "$f <= b"; fi; done)"
>
> This happens e.g. on GNU Bash v4.4 (e.g.
> https://www.tutorialspoint.com/execute_bash_online.php ).
>
>
> Best regards,
> Jaan
>


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