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Re: [Help-bash] Why not make address@hidden the same as `printf %q' outp
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From: |
Chet Ramey |
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Subject: |
Re: [Help-bash] Why not make address@hidden the same as `printf %q' output? |
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Date: |
Fri, 27 Oct 2017 14:36:07 -0400 |
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User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.4.0 |
On 10/27/17 5:48 AM, Clark Wang wrote:
> See following example:
>
> $ var=123
> $ echo address@hidden
> '123'
> $ printf '%q\n' $var
> 123
> $
> $ var='1 2 3'
> $ echo address@hidden
> '1 2 3'
> $ printf '%q\n' "$var"
> 1\ 2\ 3
> $
>
> Any particular reason to implement them differently?
It wasn't a great decision to use backslash quoting with printf %q, but
it's been that way for a long time and I'd rather not change it. The
transformation operators all use single quoting to quote when needed,
and I think that works better.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU address@hidden http://cnswww.cns.cwru.edu/~chet/