xerostomus's questions

I have directories with old incremental backups and they are full of redundant copies of various files. My plan was to use ZFS that handles checksums of files and prevent redundancy.

So a model situation:

cd /poolname/zalohy
zfs list -p poolname
NAME        USED         AVAIL     REFER  MOUNTPOINT
poolname  995328  374734901248     98304  /poolname

for i in {0..10}; do echo {1..99999} >file$i.txt; done # I create eleven identical files of the size 588888 bytes.

zfs list -p poolname
NAME         USED         AVAIL     REFER  MOUNTPOINT
poolname  5677056  374730219520     98304  /poolname

374734901248 - 374730219520 = 4 681 728, i.e. cca 5MB.

I expected that 11 identical files (with the same checksum) would take a bit more than 588888 bytes, so ten times less.

Where is the problem. How to handle this redundancy? Is there a better file system than ZFS for this purpose?

Thanks a lot for the help.

This is what I have:

echo -e "a\t4\nb\t7\nc\t2\nd\t12\n" | sed -rn 's/(.*)\t([0-9]*)$/\2\t\1\1\1\t/p'

4   aaa  
7   bbb 
2   ccc 
12  ddd 

This I want:

4   aaaa    
7   bbbbbbb  
2   cc  
12  dddddddddddd    

Is this possible in sed only or I have to use some other tools?

I need recursive listing of directories for my DVD backups. The prefect format is following:

Name of the directory:
subdirectory0/
subdirectory1/
size date time name0.txt
size date time name1.sh
size date time name2.odt

I got it with this crazy command:

ls -alFRgGv --time-style='+%Y-%m-%d %H:%M:%S' --group-directories-first | sed -r 's/^[drwx-]{10} *[0-9]* //;/^total /d;/.*\.{1,2}\/$/d ';

Please, is there any other way how to omit permissions and hard links in ls output? ("ls", not with the command "find")

Post scriptum:

There are some crazy numbers after total. There is "total 18" and only 2 files in the directory. Are those all hard links together?

I have say 30000 files of this type: picture.jpg.~12~

They are remnants of a backup (mv -v --backup=numbered ...).

I needed to switch the extensions to: picture.~12~.jpg

This works:

feh --zoom 200 --full-screen picturius.png

I need the same without full-screen:

feh --zoom 200 picturius.png # this does not work

Have you an idea where I am wrong?

I do long operations which are steadily getting broken by any power or screen saving utility, so I want to have ubuntu without any power or screensaving programs.

I tried:

sudo apt autoremove --purge light-locker*
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Note, selecting 'light-locker-settings' for glob 'light-locker*'
Note, selecting 'light-locker' for glob 'light-locker*'
The following additional packages will be installed:
  gconf-service gconf-service-backend gconf2 gconf2-common libart-2.0-2 libbonobo2-0 libbonobo2-common
  libbonoboui2-0 libbonoboui2-common libgconf-2-4 libgnome-2-0 libgnome-keyring-common
  libgnome-keyring0 libgnome2-common libgnomecanvas2-0 libgnomecanvas2-common libgnomeui-0
  libgnomeui-common libgnomevfs2-0 libgnomevfs2-common libjpeg-turbo-progs liborbit-2-0 xscreensaver
  xscreensaver-data
Suggested packages:
  gconf-defaults-service libbonobo2-bin desktop-base libgnomevfs2-bin libgnomevfs2-extra gamin | fam
  gnome-mime-data xfishtank xdaliclock xscreensaver-data-extra xscreensaver-gl xscreensaver-gl-extra
  fortune qcam | streamer gdm3 | kdm-gdmcompat
Recommended packages:
  perl5
The following packages will be REMOVED:
  light-locker* light-locker-settings* python-psutil*
The following NEW packages will be installed:
  gconf-service gconf-service-backend gconf2 gconf2-common libart-2.0-2 libbonobo2-0 libbonobo2-common
  libbonoboui2-0 libbonoboui2-common libgconf-2-4 libgnome-2-0 libgnome-keyring-common
  libgnome-keyring0 libgnome2-common libgnomecanvas2-0 libgnomecanvas2-common libgnomeui-0
  libgnomeui-common libgnomevfs2-0 libgnomevfs2-common libjpeg-turbo-progs liborbit-2-0 xscreensaver
  xscreensaver-data
0 upgraded, 24 newly installed, 3 to remove and 0 not upgraded.
Need to get 3,861 kB of archives.
After this operation, 23.3 MB of additional disk space will be used.
Do you want to continue? [Y/n] 

OK, I do not want this. I would like to remove light-locker and xscreensaver totally.

Can you help me? :-)

Thanks

PS. What I have found in the meantime:

less /usr/bin/lxlock This is the program/script that starts various external lockers. You can edit it in nano

 sudo nano /usr/bin/lxlock

and put "exit" on the second row, so you computer will not get locked at any time.

It is not a nice way to do it, but it works.

From the given posibillities (man lxlock), I guess the smallest are suckless-tools.

I got it via this strange command:

 sudo apt autoremove light-locker* gconf-service gconf-service-backend gconf2 gconf2-common libart-2.0-2 libbonobo2-0 libbonobo2-common libbonoboui2-0 gnome-power-manager gnome-screensaver gnome-settings-daemon-schemas libjpeg-turbo-progs libpam-gnome-keyring libupower-glib3 i3lock libev4

This installs (sic!) the suckless tools. :-))))

Spurious totally, isn't it? :-)

Firefox drains my batteries (bad habit of the lazybone), so I would like to STOP it for a while and then resume it again. I tried killall but without much success:

$ ps h kpcpu -eo pcpu,comm | tail -n2
 3.2 wget
35.7 firefox
$ killall -i -s STOP  firefox
Signal firefox(9661) senden? (y/N) y
$ ps h kpcpu -eo pcpu,comm | tail -n2
 3.3 wget
35.7 firefox
$ killall -s CONT  firefox
$ ps h kpcpu -eo pcpu,comm | tail -n2
 3.4 wget
35.5 firefox

Well, the stopped firefox does not react to mouse anymore, but as you see it keeps on draining MY batteries. Do I deserve such a treatment??? Is there any smart genius to persuade firefox to behave bravely? :-)

When I wanted to save TIFF file, I got this message box:

TIFF save cannot handle indexed images with alpha channel

Although I had no alpha layer.

Here is an example which cannot be exported to TIFF file because of a not-existing alpha channel

It seems to be a bug - I do not know - the only remedy is:

Ebene/Ebene auf Bildgröße and export as TIFF afterwards.