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Re: [Help-bash] Is `while :` preferred over `while true`?
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From: |
Chet Ramey |
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Subject: |
Re: [Help-bash] Is `while :` preferred over `while true`? |
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Date: |
Sun, 4 Mar 2018 16:53:59 -0500 |
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User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:52.0) Gecko/20100101 Thunderbird/52.5.2 |
On 3/3/18 9:20 AM, Peng Yu wrote:
> Hi,
>
> When I run the following command, it seems that `while :` is not
> always faster than `while true`. But my understanding is that `while
> true` calls the bash internal command `true` but `while :` does not
> call anything. So I think `while :` should be always better in terms
> of runtime. Is it so? Thanks.
Why would you think they are different? They are both builtins that do
the exact same thing. In fact, they're implemented using the same function.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU address@hidden http://tiswww.cwru.edu/~chet/