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Renaming files in dir

by larus (Acolyte)
on Mar 19, 2009 at 08:13 UTC ( #751642=perlquestion: print w/ replies, xml ) Need Help??
larus has asked for the wisdom of the Perl Monks concerning the following question:

Hi, I'm very new to perl. I'm trying to substitute some characters in file names in some directory. Here is the code
#!/bin/perl #usage: #C:\Perl>perl Replace_chars_of_files.pl "C:/Perl/" use warnings; use strict; use File::Copy; my $path = $ARGV[0]; die "You must supply a full directory path" unless (-e $path && -d $pa +th); my @dirs; opendir(DIR, $path) || die "can't opendir $path: $!"; my @fileet = grep { -f "$path/$_" } readdir(DIR); closedir(DIR); foreach my $file (@fileet) { $file =~ s/ä//g; $file =~ s/ö//g; move($file, "$path/$file"); }
This renames and copies the file but only the name of the file, not what it contains. Would you provide some help here? I'm using Windows XP.

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Re: Renaming files in dir
by bart (Canon) on Mar 19, 2009 at 08:33 UTC
    If you're not moving the file between disks, there's no need to use a module. The built in rename will work just fine.

    And I suspect your problems could be related that you don't give a full path for both arguments of move, but to just one. Maybe, instead of prepending "$path/" in front of the file name everywhere, you could chdir to $path first, and then you can use relative paths, i.e. just use the bare file basename.

    A possible second reason for trouble is that the characters you're trying to change are not in Ascii. Under the hood, (western) Windows uses 2 character sets: CP1252, Microsoft's extension to Latin-1, for the GUI, and an old DOS compatible code page (4 hundred something?) for the console — and maybe for the filesystem, too. Just try to run a script like

    print "\n";
    in the console, and you'll see what I mean. If that is indeed a problem, you'll have to find out the character code of the characters you're trying to change.
      Thanks, scandinavian characters are not the problem, the code I posted produces right substitutions. The problem is that I don't know how to save (replace) those files in the same directory with the new (chars substituted) names.
        The problem is that I don't know how to save (replace) those files in the same directory with the new (chars substituted) names.
        Like I said: use the full path for both arguments (old and new name) for move/rename, or chdir to that directory first, and use just the bare filename.
Re: Renaming files in dir
by cdarke (Prior) on Mar 19, 2009 at 09:06 UTC
    From the File::Copy documentation:
    "The move function also takes two parameters: the current name and the intended name of the file to be moved."

    Seems to me that you are creating a new filename (in $file) but not retaining the old file name for the first parameter to 'move'.

    You should test the return value for an error, for example:
    move ($oldname, $newname) or die "Unable to rename '$oldname' to '$newname': $!";
      Well, I tried this
      foreach my $file (@fileet) { my $newfile = 0; $newfile =~ s/ä//g; $newfile =~ s/ö//g; move("$file", "$path/$newfile"); }
      but this produces no output. What I'm doing wrong here?
        foreach my $file (@fileet) { my $newfile = $file; $newfile =~ s/ä//g; $newfile =~ s/ö//g; move("$file", "$path/$newfile"); }

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