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  #1 (permalink)  
Old 03-28-2008
sjohnson sjohnson is offline
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Join Date: Mar 2008
Posts: 7
Question Generation file copying for tech support backup

Hi All,

I've looked through the forum and haven't quite found what I'm looking to do.

We're migrating our systems from a midrange to HP-UX, and I'm quite new to UNIX so I'm hoping that I can get pointed in the right direction.

What I'm looking to do is save generations of files for recovery backup by tech support.

sample Format: ArcSave "filename" "count"

So what this would do is take the filename and add a counter to the end, and delete any file >= "count".

i.e.

Directory holds: subfil.sf, subfil.0001.sf, subfil.0002.sf, subfil.0003.sf, subfil.0004.sf, subfil.0005.sf

Run: ArcSave subfil.sf 4

Results:
- delete: subfil.0004.sf, subfil.0005.sf (anything >= 0004)
- rename: subfil.0003.sf to subfil.0004.sf
- rename: subfil.0002.sf to subfil.0003.sf
- rename: subfil.0001.sf to subfil.0002.sf
- rename: subfil.sf to subfil.0001.sf

If a file in the sequence didn't exist we would continue to the next file.

ie: subfil.0002.sf was missing
Results:
- delete: subfil.0004.sf, subfil.0005.sf
- rename: subfil.0003.sf to subfil.0004.sf
- rename: subfil.0001.sf to subfil.0002.sf
- rename: subfil.sf to subfil.0001.sf

I want to do a lot of other things as well, but I need a push in the right direction to get started.

Thanks, in advance, for all your help!

S. Johnson
  #2 (permalink)  
Old 03-29-2008
era era is offline Forum Advisor  
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Off the top of my head ...

Do you always have a single dot, and the number should go before that?

Code:
#!/usr/bin/perl

use strict;
use warnings;

my ($file, $max) = @ARGV;
my ($base, $ext) = split (/\./, $file);

for my $f (reverse <$base.*.$ext>) {
  next unless ($f =~ /\.([0-9]{4})\./);
  my $i = $1;  # grab number we just matched into $i
  if ($i >= $max) {
    unlink $f or warn "$0: Could not remove $f: $!\n";
    next;
  }
  # else
  my $n = sprintf "%s.%04i.%s", $base, $i+1, $ext;
  rename $f, $n or warn "$0: Could not rename $f to $n: $!\n";
}

rename $file, "$base.0001.$ext"
  or warn "$0: Could not rename $file to $base.0001.$ext: $!\n";
This is as untested as it gets. I tried a shell script first but it got really ugly. Still, hope this helps (even perhaps a little bit).
  #3 (permalink)  
Old 03-31-2008
sjohnson sjohnson is offline
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Join Date: Mar 2008
Posts: 7
Question Use of uninitialized value errors

Hi All,

Thanks for the help so far!

I'm trying to figure out how to eliminate the uninitialized value errors in my perl code.

When doing the file split:
Code:
# Split Filename From Extention
  my ($base, $ext) = split (/\./, $argFileName);
# Check For File Extension
  $HaveExt = ( ( length $ext ) < 1 ? "Y" : "N" );
I get the following error:
"Use of uninitialized value in length at test.pl line 22.

For some items I may have 2 files that have the same name one with an extention and one without so I'm checking for the extention and using that later to filter the files.

I've tried a bunch of ways to get around this but I always get some form of uninitialized value error.

How can I intialize an uninitialized value?
I've even tried:
Code:
  $ext = "" . $ext;
but that also gets the error.

Thanks, in advance!
  #4 (permalink)  
Old 03-31-2008
era era is offline Forum Advisor  
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Join Date: Mar 2008
Location: /there/is/only/bin/sh
Posts: 3,652
Code:
$var ||= "";
If the value of $var can be zero then this will overwrite the zero too; then you need to be more explicit about it being undefined:

Code:
$var = "" unless defined $var;
This is what you were apparently actually trying to do with the length trickery.

The default can of course be anything, but you indicate you wanted the empty string, so I used that in these examples.

The cheapo solution is to take out "use strict" but that's so fraught with peril I'd better not even mention that option. Oops, I already did.
  #5 (permalink)  
Old 03-31-2008
jgt jgt is offline
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Posts: 452
On SCO systems it can be done like this:
See (man ADM mount) on other systems.
[h2]Versioning filesystems (undelete)[/h2]
Versioning allows deleted files to be recovered with the undelete(C) command or on the Desktop as described in ``Deleting and recovering files and directories''. If versioning is enabled on a filesystem, files and directories can be designated for versioning and administered as described in ``Retrieving deleted files''. The versioning feature can be enabled system-wide or for individual filesystems.
To enable versioning on all non-root HTFS filesystems:
  1. Use the Hardware/Kernel Manager as described in ``Configuring kernel parameters''. Select category 10, ``Filesystem configuration.''
    • To enable versioning and set the maximum number (n) of versioned files, set MAXVDEPTH to a non-zero number.
    • To disable versioning, set MAXVDEPTH to 0 (default).
    • To set the number of seconds (n) before a file is versioned, set MINVTIME to n (a non-zero number). The default value of MINVTIME is 0.
  2. Relink the kernel with the new filesystem parameters -- see ``Rebuilding the kernel''.
  3. Reboot the system by entering:

    reboot
To enable versioning on a per-filesystem basis, see ``Filesystem mount options (HTFS, EAFS, AFS, S51K)''. To enable versioning on the root filesystem, see ``Modifying HTFS, EAFS, AFS, and S51K root filesystem mount configuration''.
  #6 (permalink)  
Old 03-31-2008
sjohnson sjohnson is offline
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Posts: 7
Cool Final code?

I just found the "defined" operator? as well?

Now I'm just wondering if using "warn" is the best way to display the output to the command line? Some people here will want to see it and others won't.

I know that there is some way of re-directing the "warn"/"die" to an error log in unix, but I can't remember the syntax for it.

As per the forums rules:
Here's the code that I finished with; we'll be adding other functionality at a later time, but here it is as it stands:

Code:
#!/usr/bin/perl

use strict;
use warnings;

# Get The Argument List
  my ($argFileName, $argMaxCount) = @ARGV;

# End Run If We Don't Have At Least 2 Arguments
  die " - Usage : $0 <FileName> <ArchiveCount>\n" if $#ARGV < 1;

# Check For Valid Arguments
  die " - $0: FileName:  $argFileName does NOT exist\n" unless ( -e $argFileName );
  die " - $0: ArchiveCount:  $argMaxCount is less than 1\n" if ( $argMaxCount < 1 );

# Split Filename From Extention
  my ($base, $ext) = split (/\./, $argFileName);

# Check For File Extension And Add "."
  $ext = ( ( defined $ext ) ? ( "." . $ext ) : "" );

# Rename The Files
  &myRename;

# Rename The Subfile Dictionaries As Well 
  if ( $ext eq ".sf" ) {
    warn "\n - Processing Subfile Dictionaries:\n\n";
    $ext = ".sfd";
    &myRename;
  }

# End Processing
exit;

sub myRename
{
  # Get File List In Reverse Order

  for my $curFile ( reverse <$base*$ext> ) {
  # Skip Non-Matching Extentions
    my ($curBase, $curExt) = split (/\./, $curFile);
    $curExt = ( ( defined $curExt ) ? ( "." . $curExt ) : "" );
    next unless $ext eq $curExt;

  # Skip Non-Version File Names
    next unless ( $curFile =~ /$base\_([0-9]{4})$ext/ );

  # Save This Version Number
    my $fileVersionNum = $1;  # Grab Number We Just Matched Into $fileVersionNum

  # Purge All Matching File Versions >= The Max Counter
    if ( $fileVersionNum >= $argMaxCount ) {
      warn " - Removing - $curFile\n";
      unlink $curFile or warn " - $0: Could not remove $curFile: $!\n";
      next;
    };
    # else
    my $newFile = ( sprintf "%s_%04i%s", $base, $fileVersionNum+1, $ext );
    warn " - Renaming - $curFile -> $newFile\n";
    rename $curFile, $newFile or warn " - $0: Could not rename $curFile to $newFile: $!\n";
  };

  my $oldFile = ( sprintf "%s%s", $base, $ext );
  my $newFile = ( sprintf "%s_%04i%s", $base, 1, $ext );
  warn " - Renaming - $oldFile      -> $newFile\n";
  rename ( $oldFile, $newFile ) or warn " - $0: Could not rename $oldFile to $newFile: $!\n";
};
  #7 (permalink)  
Old 03-31-2008
era era is offline Forum Advisor  
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command 2>/dev/null if you don't want to see the error output from command

Might be a useful addition to add a -q option if your users are too young to know where to look for the ">" key. Also it's good to be able to tweak down the verbosity from routine warnings but still notice if there are fatal errors.

Actually, looking at your "warnings", I would make them conditional on a -v (verbose) switch instead. They're just diagnostics and if the tool is used even semi-routinely, users will not be reading that output anyway (even when things went wrong).

I would keep the $ext (and $curExt etc) without the dot, and add it when it's needed, rather than vice versa. I think it would simplify the code.

As another minor design nit, I would make myRename require the extension as a parameter, so you don't mess with global variables within and outside the function. It doesn't really matter here, just basic code hygiene.
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