Re: [RFC] war on echo in scripts

From: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Date: Jul 9, 2010, 11:52 UTC
Message-ID: <AANLkTint6AfhwKdeizt-YVt4O6AZbLG9A5h6ipJyQyIQ@mail.gmail.com>
In-Reply-To: <20100709024633.GA13739@dert.cs.uchicago.edu>

On Fri, Jul 9, 2010 at 02:46, Jonathan Nieder <jrnieder@gmail.com> wrote:

Show 16 quoted lines

> Andreas Schwab wrote:
>> Jonathan Nieder <jrnieder@gmail.com> writes:
>
>>>  die() {
>>> -    echo >&2 "$@"
>>> +    printf >&2 '%s\n' "$@"
>>
>> You probably want to use "$*" here, though it wouldn't matter for the
>> uses of die in this file.
>
> Hmm, maybe something like this would be easier.
> [...]
> +echo() {
> +       printf '%s\n' "$*"
> +}
> +

Overriding builtins like this isn't portable.

(Via H.Merijn Brand): This fails on the old HP-UX 10.20 bourne shell:

    > cat xx.sh
    #!/bin/sh

    echo ()
    {
    perl -le'print "Done!"'
    }

    echo 1
    echo Klaar
    > sh xx.sh
    xx.sh[3]: The operation is not allowed in a restricted shell.:
echo is a shell builtin.
    1
    Klaar