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Re: hash not restored after running command -p
From: |
Oğuz |
Subject: |
Re: hash not restored after running command -p |
Date: |
Sun, 31 Oct 2021 20:36:49 +0300 |
On Sun, Oct 31, 2021 at 7:07 PM Mike Jonkmans <bashbug@jonkmans.nl> wrote:
>
> On Sun, Oct 31, 2021 at 05:23:03PM +0200, Oğuz wrote:
> > 31 Ekim 2021 Pazar tarihinde Mike Jonkmans <bashbug@jonkmans.nl> yazdı:
> > >
> > > Using the hash as alias for commands, that are not in your PATH,
> > > seems risky though.
> >
> > Why? Risky how?
>
> Risky, mostly on a cognitive level.
>
> 'command -p foo' doesn't look like it has a side effect.
How does a command look like it has side effects?
>
> E.g. assume you have /usr/local/bin/foo and /bin/foo
> PATH=/usr/local/bin
> command -p foo
> foo
>
> You would not think that /bin/foo is executed for foo, given the value of
> PATH.
I suppose I would not, because the manual doesn't say `command -p' has
this effect. I'll give you that.
>
> It could also lead to bugs.
> E.g.
> PATH=/usr/local/bin
> source script
> foo
>
> When the 'command -p foo' is introduced in the sourced script, foo changes.
Yes, that's how `source' works; contents of the sourced file alters
the sourcing application's execution environment. In addition to
calling `command -p foo', if the sourced file changes `PATH', or
defines a function named `foo', or enables `expand_aliases' and
defines an alias named `foo', `foo' 'changes'.
>
> --
> Regards, Mike Jonkmans
>
- hash not restored after running command -p, Roger Morris, 2021/10/29
- Re: hash not restored after running command -p, Chet Ramey, 2021/10/30
- Re: hash not restored after running command -p, Mike Jonkmans, 2021/10/31
- Re: hash not restored after running command -p, Oğuz, 2021/10/31
- Re: hash not restored after running command -p, Mike Jonkmans, 2021/10/31
- Re: hash not restored after running command -p, Oğuz, 2021/10/31
- Re: hash not restored after running command -p, Mike Jonkmans, 2021/10/31
- Re: hash not restored after running command -p,
Oğuz <=
- Re: hash not restored after running command -p, Mike Jonkmans, 2021/10/31
Re: hash not restored after running command -p, Roger Morris, 2021/10/31