Removed ^M from Libraries Post: 302231302

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Top Forums UNIX for Advanced & Expert Users Removed ^M from Libraries Post 302231302 by buffoonix on Tuesday 2nd of September 2008 04:55:08 AM

09-02-2008

Registered User

I never questioned that.
As the other poster already said, it's time to role the restore from the backup.
Just an aside,
if you (the thread issuer) like me have your filesystems on LVM volumes (yes I do have a separate lv_usr)
there is a neat feature that can be used for rolling back quickly from an unfortunate experiment like yours without even rolling a regular backup.
Before I do such dubious recursive substitutions I just would create a snapshot volume of the affected LV like

Code:

[root@toshsat:~]
# df /usr
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/mapper/vgfc-lv_usr
                       5160576   3193892   1704540  66% /usr
[root@toshsat:~]
# vgdisplay vgfc|egrep 'PE Size|Free  PE'
  PE Size               8.00 MB
  Free  PE / Size       11 / 88.00 MB
[root@toshsat:~]
# lvcreate -s -n snapof_usr -l 11 /dev/vgfc/lv_usr
  Logical volume "snapof_usr" created
[root@toshsat:~]
# lvs -o lv_name,lv_size,origin,snap_percent vgfc
  LV           LSize   Origin Snap% 
  lv_depot       9.80G              
  lv_home      512.00M              
  lv_opt       512.00M              
  lv_root        1.00G              
  lv_tmp       512.00M              
  lv_usr         5.00G              
  lv_usr_local 256.00M              
  lv_var         1.00G              
  snapof_usr    88.00M lv_usr   0.01

Above I only created a snapshot of 88 MB of the 5 GB /usr volume because I hadn't any more free PEs in my vgfc. Smilie

Normally, one would adapt this to the size of the snapped of LV and the anticipated amount of changes during the period one would possibly require the snapshot.
As a rule of thumb 10% suffice, but this depends on the changes in the filesystem.
Since /usr is pretty static (and even could be mounted ro often) there won't be many changes.
From the lvs command above you can watch the filling up of the snapshot with the changes.
Once the snap_percent approaches 100% your snapshot is useless and can't be any longer used for recoveries.
Now you can safely run your command.
If something goes wrong, you simply mount the snapshot volume ro somewhere and run your restore.
Once you no longer need your snapshot simply lvremove it.

Code:

[root@toshsat:~]
# mount -r /dev/vgfc/snapof_usr /mnt/tmp2
[root@toshsat:~]
# df /usr /mnt/tmp2
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/mapper/vgfc-lv_usr
                       5160576   3193892   1704540  66% /usr
/dev/mapper/vgfc-snapof_usr
                       5160576   3193892   1704540  66% /mnt/tmp2
[root@toshsat:~]
# umount /mnt/tmp2
[root@toshsat:~]
# lvremove -f /dev/vgfc/snapof_usr 
  Logical volume "snapof_usr" successfully removed

Last edited by buffoonix; 09-02-2008 at 06:03 AM..

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LEARN ABOUT X11R4

perlmacos

PERLMACOS(1)						 Perl Programmers Reference Guide					      PERLMACOS(1)

NAME

       README.macos - Perl under Mac OS (Classic)

SYNOPSIS

       This document briefly describes perl under Mac OS (Classic).  If you are running perl under Mac OS X, you don't want to be here (unless you
       are in the Classic environment under Mac OS X).

       When we say "Mac OS" below, we mean Mac OS 7, 8, and 9, and not Mac OS X.

DESCRIPTION

       The latest perl source itself builds on Mac OS, with some additional pieces. Support for Mac OS is now in the perl core, and MacPerl is
       kept in close sync with regular perl releases.

       To build perl for Mac OS (as an MPW tool), you will need the addition of the macos subdirectory, distributed separately.  It includes extra
       source files, config files, and make files.  It also includes extra Mac-specific modules.

       To build the MacPerl application, you will also need the macperl directory, which includes the source files for creating the application
       itself.

       All of this is available from the development site, via HTTP (in the MacPerl Installer, which includes all the source and binaries) and
       anonymous CVS.

	       http://dev.macperl.org/

       The source is also in the main perl repository in the macperl branch (the 5.6 source is in the maint-5.6/macperl branch).

       You will also need compilers and libraries, all of them freely available.  These are linked to from the SourceForge site. Go that site for
       all things having to do with MacPerl development.

       MacPerl 5.6.1 and later are supported on Mac OS 8.1 and later, for 68040 and PowerPC architectures.  The MPW tool may be used on Mac OS
       7.5.5 and 68030 computers.

       MacPerl 5.2.0r4 is also available, on the CPAN and on SourceForge.  It is based on perl 5.004, and works with Mac OS 7.5.5 and 68030 com-
       puters.

AUTHOR

       perl was ported to Mac OS by Matthias Neeracher <neeracher@mac.com>.  It is currently maintained by Chris Nandor <pudge@pobox.com>.

DATE

       Last modified 2002.05.02.

perl v5.8.9							    2007-11-17							      PERLMACOS(1)