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Top Forums UNIX for Dummies Questions & Answers Generation file copying for tech support backup Post 302180606 by era on Monday 31st of March 2008 03:32:46 PM
Old 03-31-2008
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.
 

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VGCFGBACKUP(8)                                                System Manager's Manual                                               VGCFGBACKUP(8)

NAME
vgcfgbackup - backup volume group descriptor area SYNOPSIS
vgcfgbackup [-d|--debug] [-f|--file filename] [-h|--help] [--ignorelockingfailure] [-P|--partial] [-v|--verbose] [VolumeGroupName...] DESCRIPTION
vgcfgbackup allows you to backup the metadata of your volume groups. If you don't name any volume groups on the command line, all of them will be backed up. In a default installation, each volume group gets backed up into a separate file bearing the name of the volume group in the directory /etc/lvm/backup. You can write the backup to an alternative file using -f. In this case if you are backing up more than one volume group the filename is treated as a template, and %s gets replaced by the volume group name. NB. This DOESN'T backup user/system data in logical volume(s)! Backup /etc/lvm regularly too. OPTIONS
See lvm for common options. SEE ALSO
lvm(8), vgcfgrestore(8) Sistina Software UK LVM TOOLS 2.02.95(2) (2012-03-06) VGCFGBACKUP(8)
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