bug#34126: closed (Re: bug#34126: grep v. 3.1 – unexpected error message "grep: i.: No such file or directory")

[Ricky Tigg]

Hi. I can't be without thanking you – *Eric Blake* –, both for the
relevance of your detailed explanation and the useful descriptions. Regards.

pe 18. tammik. 2019 klo 21.38 GNU bug Tracking System (address@hidden)
kirjoitti:

> Your bug report
>
> #34126: grep v. 3.1 – unexpected error message "grep: i.: No such file or
> directory"
>
> which was filed against the grep package, has been closed.
>
> The explanation is attached below, along with your original report.
> If you require more details, please reply to address@hidden
>
> --
> 34126: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=34126
> GNU Bug Tracking System
> Contact address@hidden with problems
>
>
>
> ---------- Forwarded message ----------
> From: Eric Blake <address@hidden>
> To: Ricky Tigg <address@hidden>, address@hidden
> Cc:
> Bcc:
> Date: Fri, 18 Jan 2019 14:37:30 -0600
> Subject: Re: bug#34126: grep v. 3.1 – unexpected error message "grep: i.:
> No such file or directory"
> tag 34126 notabug
> thanks
>
> On 1/18/19 2:27 PM, Ricky Tigg wrote:
> > OS: *Fedora*; Component: grep.x86_64  3.1-8.fc29
> >
> > Commands executed:
> >
> > $ dnf list|grep -Ei langpack | grep fi.
> > glibc-langpack-fi.x86_64            2.28-26.fc29         @updates
> > langpacks-fi.noarch                 1.0-13.fc29          @System
> > (...)
> >
> > $ dnf list|grep -Ei langpack | grep fi. | grep "-fi."
> > grep: i.: No such file or directory
> >
> > Using grep twice in the same command, the command's last grep is expected
> > to produce targets, not an STDERR. Probably an issue.
>
> Not an issue in grep, but in your attempt to use a pattern beginning
> with - in a way that grep cannot distinguish from options.  That is, you
> asked grep to use the -f option, which takes an argument, so it used
> "i." as the argument for -f, and failed because there is no file named
> 'i.' in your current directory.  (That's true whether you write -fi. or
> "-fi.", because the shell strips quoting before grep sees its argv[]).
>
> You want to use either of these formulations instead:
>
> grep -e -fi.
> grep -- -fi.
>
> where the "-e" option says to treat the next argv[] entry as a pattern,
> even if it otherwise would look like an option, and then continue
> finding further options; while the "--" argument says that no more
> options are present, and that all further command line arguments are
> treated according to their traditional positional usage).  The
> difference becomes apparent in constructs like:
>
> grep -e -fi. -i     # greps stdin case-insensitively for "-fi."
> grep -- -fi. -i     # greps file ./-i case-sensitively for "-fi."
>
> --
> Eric Blake, Principal Software Engineer
> Red Hat, Inc.           +1-919-301-3226
> Virtualization:  qemu.org | libvirt.org
>
>
>
>
> ---------- Forwarded message ----------
> From: Ricky Tigg <address@hidden>
> To: address@hidden
> Cc:
> Bcc:
> Date: Fri, 18 Jan 2019 21:27:02 +0100
> Subject: grep v. 3.1 – unexpected error message "grep: i.: No such file or
> directory"
> OS: *Fedora*; Component: grep.x86_64  3.1-8.fc29
>
> Commands executed:
>
> $ dnf list|grep -Ei langpack | grep fi.
> glibc-langpack-fi.x86_64            2.28-26.fc29         @updates
> langpacks-fi.noarch                 1.0-13.fc29          @System
> (...)
>
> $ dnf list|grep -Ei langpack | grep fi. | grep "-fi."
> grep: i.: No such file or directory
>
> Using grep twice in the same command, the command's last grep is expected
> to produce targets, not an STDERR. Probably an issue.
>