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Re: >= and <= for string comparison


From: Ruiyang Peng
Subject: Re: >= and <= for string comparison
Date: Tue, 17 Jan 2023 11:09:23 +0800
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Thunderbird/109.0

On 2023/1/17 7:55, Peng Yu wrote:
OK. I never thought about that.

It is functionally equivalent, but not as readable as >= and <=.

For the same logic, for arithmetic operators, we could use ((! (x< y)
)) and ((! (x > y) )). But there are still >= and <= for arithmetic
operators. Why don't have >= and <= for strings?

On 1/16/23, Kerin Millar <kfm@plushkava.net> wrote:
On Mon, 16 Jan 2023 12:01:12 -0600
Peng Yu <pengyu.ut@gmail.com> wrote:

string1 < string2
               True if string1 sorts before string2 lexicographically.

        string1 > string2
               True if string1 sorts after string2 lexicographically.

According to the manual, >= and <= are not available for string
comparison. But if >= and <= are available for arithmetic expression.
Why >= and <= can not be introduced for string comparison? Currently,
as a walkaround, I have to use > and = for >=, and < and = for <=. It
is rather cumbersome to write bash code in this way.
This is not a response to the question itself but the penultimate sentence
isn't true. [[ ! str1 < str2 ]] and [[ ! str1 > str2 ]] would also do.

--
Kerin Millar

I think it would be simple to add support for >= and <=, and would also unify operations on strings with arithmetic operations.  I haven't figured out what problem this could cause just yet.  I think the biggest reason why bash didn't add this is that it's not very useful.

--
Ruiyang Peng


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