Re: [MacPerl] Sequence Error?

[rjk@linguist.dartmouth.edu (Ronald J. Kimball)]

Richard Gordon wrote:
> 
> When I attempt to run a script in bash under mkLinux that works fine under
> MacPerl, I get a weird error on the command line that is something like:
> 
> Sequence[?(root@localhost/cgi-bin)]#

I have never seen that error before.  Are you sure it's an error message
from Perl?

> I could have some of that wrong, but the point is that the prompt begins
> with Sequence followed by ? and the script won't run. After monkeying around
> with it for a file, I found that the offending portion is the grep line of
> the following:
> 
> opendir(DIR, $directory) or
>     die 'cannot open Commentary directory';
> @files = grep { /^(?:(?!_).)*$/ } readdir(DIR);
> closedir(DIR);
> 
> I'm just trying to create a list of files in a directory and am filtering
> out some that have a _ in their names. If I change the line to
> 
> @files = readdir(DIR);
> 
> it works fine in mkLinux, but I lose filtering. So, is this a Mac thing, a
> Linux thing, or what? Thanks.

That's a very very ugly regex to filter out strings with '_' in them.

(?:(?!_).)

That matches any character that is not an underscore, correct?  A much
nicer way to say that is:

[^_]

[
    Or, if you want to be pedantic:

    [^_\n]

    because (?:(?!_).) won't match newlines.
]

So your grep command could be written as:

grep { /^[^_]*$/ } readdir(DIR);


But another way to say 'contains all non-underscores' is 'does not contain
an underscore':

grep { !/_/ } readdir(DIR);

which, I think, is even simpler.


I don't know why you were getting the 'error message' you mentioned above,
so I don't know if this will fix your problem.  It certainly can't hurt,
though.


Ronald

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