[Chicago-talk] Perl script cannot find itself?

[Brian Katzung]

When the line endings are \r\n instead of just \n, vim sets the 
fileformat to dos instead of unix. This is why list mode didn't reveal 
them. To fix them using vim:

vim test.pl
:se ff=unix        (short form of ":set fileformat=unix")
:wq

   - Brian

On 2011-06-17 10:19, tiger peng wrote:
> Thanks, You are right. (I thought after using vi to edit it, the \r 
> should be gone)
>
> /tmp>$ od -c test.pl
> 0000000   #   !   /   u   s   r   /   l   o   c   a   l   /   b   i   n
> 0000020   /   p   e   r   l \r \n   s   y   s   t   e   m       (   '
> 0000040   w   h   i   c   h       p   e   r   l   '   )   ;  \r  \n   p
> 0000060   r   i   n   t       "   h   i   \   n   "   ;  \r  \n
> 0000076
> /tmp>$ perl -i -pe 's/\r//' test.pl
> $ od -c test.pl
> 0000000   #   !   /   u   s   r   /   l   o   c   a   l   /   b   i   n
> 0000020   /   p   e   r   l  \n   s   y   s   t   e   m       (   '   w
> 0000040   h   i   c   h       p   e   r   l   '   )   ;  \n   p   r   i
> 0000060   n   t       "   h   i   \   n   "   ;  \n
> 0000073
> /tmp>$  test.pl
> /usr/local/bin/perl
> hi
>
>
> ------------------------------------------------------------------------
> *From:* Clyde Forrester <clydeforrester at gmail.com>
> *To:* Chicago.pm chatter <chicago-talk at pm.org>
> *Sent:* Friday, June 17, 2011 9:42 AM
> *Subject:* Re: [Chicago-talk] Perl script cannot find itself?
>
> I generally use the od -c command to check for stuff like that.
> If you see "0d 0a" combinations instead of just "0a", then you have 
> carriage returns.
>
> od -c test.pl <http://test.pl>
>
> c4
>
> tiger peng wrote:
> > I checked them with vi's list command, there is no cartridge return 
> character in the scripts.
> >
> > ------------------------------------------------------------------------
> > *From:* Andrew Rodland <andrew at cleverdomain.org 
> <mailto:andrew at cleverdomain.org>>
> > *To:* Chicago.pm <http://Chicago.pm> chatter <chicago-talk at pm.org 
> <mailto:chicago-talk at pm.org>>
> > *Sent:* Thursday, June 16, 2011 9:19 PM
> > *Subject:* Re: [Chicago-talk] Perl script cannot find itself?
> >
> > On Thursday, June 16, 2011 04:47:39 PM tiger peng wrote:
> > > There are two Perl scripts only different by the first line. Why 
> the one
> > > without -w in the #! line cannot find itself but the own with -w can?
> >
> > Because you saved the file with windows line-endings, and there's a 
> \cM at the
> > end of every line. In the first case, the kernel is looking for
> > "/usr/local/bin/perl\cM" and can't find it. In the second case the 
> kernel is
> > looking for "/usr/local/bin/perl" and running it with an argument of 
> "-w\cM",
> > which is harmless.
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>
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-- 
Brian Katzung, Kappa Computer Solutions, LLC
Leveraging UNIX, GNU/Linux, open source, and custom
software solutions for business and beyond
Phone: 877.367.8837 x1  http://www.kappacs.com

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