It's clear that you're working on files in a directory but I'm not sure what are you trying to achieve as you provide a very small amount of information on that. For what you're doing, Perl provides built-in functions so you don't need external program like ls: opendir, readdir, and closedir. Examples (untested), 
my $dir = shift; # get the first command line arg
my $path = "/remote/scm/rsync/builds/$arg/FailedInformal";

opendir DIR, $path or die "Can't open $path: $!\n";
my @releases = grep {/^\d/} readdir DIR;

# NOW, it's up to you what you want with files you find
# in @releases

# get the latest three
my @three = @releases[-1,-2,-3];

# get only the very latest
my $latest = $relreases[-1];
....

# and closing the DIR handle is good
closedir DIR;

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One thing to note: since you're working on the current directory (wherever it is), you have to use the original path to work on a file. For example, the following is wrong, 
open FILE, $latest or die "Can't open $latest: $!\n";
....

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Instead, you have to write, 
# presume / as path separator
my $latest_file = "$path/$latest";
open FILE, $latest_file or die ...;

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As to the error message, it just says what the perl interpreter thinks, the file doesn't exist. Check it manually if that's not what you think.

Open source softwares? Share and enjoy. Make profit from them if you can. Yet, share and enjoy!

In reply to Re: problem to open a specified path file in open system call by naikonta
in thread problem to open a specified path file in open system call by Anonymous Monk

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