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Re: [Help-bash] Inconsistency of the behavior of `source` with and witho

From: Peng Yu
Subject: Re: [Help-bash] Inconsistency of the behavior of `source` with and without arguments in function
Date: Wed, 22 Jul 2015 10:16:18 -0500

On Wed, Jul 22, 2015 at 8:51 AM, Chet Ramey <address@hidden> wrote:
> On 7/17/15 8:51 PM, Peng Yu wrote:
>> Hi, The following code shows that $@ is treated differently when
>> `source` is used with and without arguments in `function`. Isn't it
>> better to make `source` always pass "$@" from the source script back
>> to the external script whether arguments are used with `source` or
>> not?
> This was a conscious decision.  `source' will temporarily set the
> positional parameters from arguments following the filename, so sourced
> files can be a little closer to scripts or shell functions.  However,
> since `source' is supposed to act as if the commands it executes were
> entered directly, changes to the positional parameters made within the
> sourced file persist.

I agree changes in the positional parameters in the sourced file
should persist. But that should also be applied to the case when a
script is sourced with parameters as in `source "$@"`. After
all `source` is not function.

Alternatively, wouldn't it better to allow users to decide whether any
changes in "$@" should be persistent outside the sourced script.

>  It has been this way for a very long time, back
> to the bash-1.x days.
> --
> ``The lyf so short, the craft so long to lerne.'' - Chaucer
>                  ``Ars longa, vita brevis'' - Hippocrates
> Chet Ramey, ITS, CWRU    address@hidden


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