Re: troubleshooting slow disk writes on squeeze.

2010-10-19 Thread Michael Iatrou
When the date was Tuesday 19 of October 2010, Siju George wrote:

> On Tue, Oct 19, 2010 at 9:33 PM, Michael Iatrou  
wrote:
> > When the date was Tuesday 19 of October 2010, Siju George wrote:
> > > Recently Saving/Copying files from Windows Clients to the Samba
> > > server has become slow at times.
> > 
> > [...]
> > 
> > > What else can I do to trouble shoot this problem?
> > 
> > The first step is to verify that this is not a problem of the Windows
> > clients. So, you should perform a few tests with Linux clients for the
> > Samba server.
> 
> Yes the same is true for linux clients as well as even for
> 
> crontab -e
> 
> from the server's commandline itself

When you say that it becomes slow, do you have any comparison figures 
between normal and "slow" operation?

Shooting in the dark here:

Do you get any suspicious messages from dmesg? How much free space do you 
have on the disk and what filesystem? Is it a new disk (4k native blocks, 
misaligned partitions)?

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Re: troubleshooting slow disk writes on squeeze.

2010-10-19 Thread Michael Iatrou
When the date was Tuesday 19 of October 2010, Siju George wrote:

> Recently Saving/Copying files from Windows Clients to the Samba server
> has become slow at times.
[...]
> What else can I do to trouble shoot this problem?

The first step is to verify that this is not a problem of the Windows 
clients. So, you should perform a few tests with Linux clients for the Samba 
server.

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Re: [Slightly OT] Laptop battery draining in Lenny

2010-07-30 Thread Michael Iatrou
When the date was Friday 30 of July 2010, Mark wrote:

> I am curious how others on this list manage their laptop batteries while
> using Debian.  From doing some research, there doesn't appear to be many
>  (if any) software solutions for draining a laptop battery completely,
>  before recharging.  So what do people on this list do - just keep
>  running Debian on battery power until the battery totally dies, which
>  sometimes doesn't give you ample time to shut down properly?  Or do you
>  shutdown  when the battery reaches, say, 5%?

Just use a resistor to fully discharge the battery.

Michael



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Re: simple way to securely destroy deleted files in a file system

2010-07-16 Thread Michael Iatrou
When the date was Friday 16 of July 2010, Jordan Metzmeier wrote:

> On 07/15/2010 08:46 PM, Michael Iatrou wrote:
> > I am skeptical whether there is any good reason for tools like wipe2fs,
> > zerofree and friends (if there are any...), when a dd && sync && rm
> > have the same result.
> 
> You could say this about many things. These commands make things
> convenient. Why do those things manually when software can do it for you?
> 
> Example:
> 
> Under the same logic I could say that there no good reason for dget. I
> can manually wget the .dsc, .tar.orig and .changes to accomplish the
> same thing... but why when I can just dget the .dsc?

This is rather a philosophical question than a technical one: it is part of 
UNIX mentality to have simple tools that can be put together to complete 
complicated tasks. Practically seen, if the original poster was educated 
with the principles of UNIX design, he wouldn't try to find a specialized 
tool to perform a simple task.

Just my 2cents.

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Re: Converting *.mp4 to *.mp3 or *.ogg

2010-07-15 Thread Michael Iatrou
When the date was Thursday 15 of July 2010, AG wrote:

> Hey all
> 
> What recommendations would you have for an app to convert *.mp4 to
> either *.mp3 or *.ogg?
> 
> Thanks for any suggestions.
> 
> AG
> 

I used a script like this (I just rewrote it from the top of my head, so 
this one is untested):

EXT="mp4"
DEST="/home/michael/music"

for F in *.${EXT}; do
N=${F/$EXT/wav}
mplayer -vc dummy -vo null -ao pcm -aofile "${DEST}/${N}" "$F"
normalize "${DEST}/${N}"
lame --verbose -q 2 --abr 192 "${DEST}/${N}" "${DEST}/${F/$EXT/mp3}"
done

The catch with this over-engineered and occasionally inefficient script was 
that I would use it for both random audio formats and video files to extract 
the audio track (think presentation-to-podcast-like conversion).

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Re: simple way to securely destroy deleted files in a file system

2010-07-15 Thread Michael Iatrou
When the date was Thursday 15 of July 2010, green wrote:

> thib wrote at 2010-07-15 13:13 -0500:
> > Take a look at shred (coreutils), wipe and secure-delete.
> 
> +1 wipe; I have used it to wipe an entire block device.
> Also wipe2fs for zeroing unused space; and zerofree seems very similar.

I am skeptical whether there is any good reason for tools like wipe2fs, 
zerofree and friends (if there are any...), when a dd && sync && rm have the 
same result.

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Re: Search engine for documentation indexing?

2010-02-09 Thread Michael Iatrou
When the date was Tuesday 09 of February 2010, Wayne  
wrote:

> Ian Zimmerman wrote:
> > I'd like to build an index of the documentation in /usr/share/doc, [...]
> > I can't be the only one looking for this, so what do other debianists
> > do?
> 
> I use recoll and dwww but rely on recoll more and more.

One more vote for recoll. Supports custom filters and you can index most 
common documentation formats.

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Re: mount.crypt, LUKS volumes and keyfiles

2009-05-15 Thread Michael Iatrou
When the date was Friday 15 May 2009, Γιώργος Πάλλας wrote:

> Michael Iatrou wrote:
> > When the date was Wednesday 13 May 2009, Γιώργος Πάλλας wrote:
> >> Has anybody managed to mount a LUKS volume using a key-file, with
> >> 'mount.crypt'? (or 'just mount')
> >
> > 
> > Have you tried pmount?
> > 
>
> No, I didn't know this mount wrapper. Anyway, tried it and it failed...
> So I just downloaded the source package of libpam-mount, I checked its
> source, hardcoded the key file, compiled it, and now I'm using a custom
> mount.crypt binary to do my job. Maybe I will send a patch also ;-)

Since you were in there, it was a great opportunity to check what was wrong.

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Re: mount.crypt, LUKS volumes and keyfiles

2009-05-14 Thread Michael Iatrou
When the date was Wednesday 13 May 2009, Γιώργος Πάλλας wrote:

> Has anybody managed to mount a LUKS volume using a key-file, with
> 'mount.crypt'? (or 'just mount')


Have you tried pmount?


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Re: Why is the kernel in testing so far behind what's current?

2009-05-14 Thread Michael Iatrou
When the date was Thursday 14 May 2009, thveillon.debian wrote:

> Raffaele Morelli wrote:
> > 2009/5/14 Daryl Styrk  > <mailto:darylst...@gmail.com>>
> >
> > -BEGIN PGP SIGNED MESSAGE-
> > Hash: SHA1
> >
> > On Thu, May 14, 2009 at 06:15:42AM -0500, Nate Bargmann wrote:
> > > I dumped Network Manager and went with WiCD.  No regrets for
> > > doing so.
> > >
> > > - Nate >>
> >
> > Same here much better.
> >
> > - --
> >
> >
> > +1
>
> Just for the records, +1.
> nm keeps freezing my system.

Indeed wicd is so much better than NetworkManager in terms of stability.

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Re: Software raid OK?

2009-04-20 Thread Michael Iatrou
When the date was Monday 20 April 2009, Sam Kuper wrote:

> Michael,
>
> 2009/4/20 Michael Iatrou 
>
> > When the date was Monday 20 April 2009, Douglas A. Tutty wrote:
> > > On Mon, Apr 20, 2009 at 03:29:00PM +0300, Michael Iatrou wrote:
> > > > There is no particularly good reason to have the swap on RAID. You
> > > > should define three independed swap partitions; if disk fails,
> > > > kernel will use the other available.
> > >
> > > If swap fails, what happens if something important to the running of
> > > the system (not just a user app) is swapped-out?  I've seen advice on
> > > this list many times that to avoid a crash, if other system stuff is
> > > on raid, that swap should be as well.
> >
> > I cannot confirm that; instead I am assuming a workflow like the
> > following:
> >
> > 1. A disk is about to fail
> > 2. Notification from SMART hits sysadmin's mailbox
> > 3. # swapoff /dev/sdXY
> > 4. Replace disk, create partitions
> > 5. # swapon /dev/sdXY
> > 6. # mdadm /dev/mdK -a /dev/sdXZ
>
> If the system is running unattended - for instance if it's a server being
> run by a hobbyist, which doesn't have a sysadmin permanently available to
> respond to problems - then step 3 may not occur before the disk fails. In
> this scenario, isn't Douglas right that it's better to have the swap on
> (redundant) RAID?

I don't think there is a silver bullet for this.

There is a performance penalty related to soft-RAID. Also swappiness 
configuration must be taken into account. Physical memory and memory usage 
patterns from application perspective count too. And of course the required 
availability for the application is an important factor.

All I am saying is that when thorough evaluation of parameters like the 
above is out of scope, there is probably no good reason to have swap on 
RAID.

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Re: Software raid OK?

2009-04-20 Thread Michael Iatrou
When the date was Monday 20 April 2009, Douglas A. Tutty wrote:

> On Mon, Apr 20, 2009 at 03:29:00PM +0300, Michael Iatrou wrote:
> > When the date was Monday 20 April 2009, BAGI Akos wrote:
> > > Hi List!
> > >
> > > I installed a software raid, level1 with 3 disks, one of them is a
> > > spare.
> > >
> > > I have 2 partitions:
> > > md0 is for / and is made of sda1,sdb1, sdc1
> > > md1 is for swap and made of sda2,sdb2, sdc2
> >
> > There is no particularly good reason to have the swap on RAID. You
> > should define three independed swap partitions; if disk fails, kernel
> > will use the other available.
>
> If swap fails, what happens if something important to the running of the
> system (not just a user app) is swapped-out?  I've seen advice on this
> list many times that to avoid a crash, if other system stuff is on raid,
> that swap should be as well.

I cannot confirm that; instead I am assuming a workflow like the following:

1. A disk is about to fail
2. Notification from SMART hits sysadmin's mailbox
3. # swapoff /dev/sdXY
4. Replace disk, create partitions
5. # swapon /dev/sdXY
6. # mdadm /dev/mdK -a /dev/sdXZ

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Re: Software raid OK?

2009-04-20 Thread Michael Iatrou
When the date was Monday 20 April 2009, BAGI Akos wrote:

> Hi List!
>
> I installed a software raid, level1 with 3 disks, one of them is a spare.
>
> I have 2 partitions:
> md0 is for / and is made of sda1,sdb1, sdc1
> md1 is for swap and made of sda2,sdb2, sdc2

There is no particularly good reason to have the swap on RAID. You should 
define three independed swap partitions; if disk fails, kernel will use the 
other available.

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Re: ssh connection takes long time

2009-03-02 Thread Michael Iatrou
When the date was Monday 02 March 2009, abdelkader belahcene wrote:

> Hi,
> When I connect to ssh server ( server running Redhat )  from debian  it
> takes a long time to give me the prompt, while I receive the prompt
> rapidly when I connect from slackware or solaris?
> thanks for help

Running ssh with -vvv option will give you a hint at which "step" you get 
the delay.

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Re: netcat in listen mode don't exit

2009-02-11 Thread Michael Iatrou
When the date was Wednesday 11 February 2009, Paulo Brito wrote:

> 2009/2/11 Michael Iatrou 
>
> > When the date was Wednesday 11 February 2009, Paulo Brito wrote:
> > >  I"m trying to setup netcat so it serves logs to other systems. When
> > > a client connects, the server starts to send some logs.
> > >
> > > I run netcat in listem mode like this:
> > >
> > > # nc -l -p 5558 -c "tail -f /var/log/syslog"
> >
> > while :; do nc -l -p 5558 -c "tail -f /var/log/syslog"; done
> >
> Michael, thanks for your reply. But if you read my entire email, you'll
> see that the problem is netcat NOT exiting after disconnect. So, your
> script will not solve the problem, because the nc never exits.

You execute ``tail -f'', which actually never returns. You may try the -w 
delay option:

# while :; do nc -l -w 10 -p 5558 -c "tail -f /var/log/syslog"; done

Please avoid top posting.

Thanks,

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Re: netcat in listen mode don't exit

2009-02-11 Thread Michael Iatrou
When the date was Wednesday 11 February 2009, Paulo Brito wrote:

>  I"m trying to setup netcat so it serves logs to other systems. When a
> client connects, the server starts to send some logs.
>
> I run netcat in listem mode like this:
>
> # nc -l -p 5558 -c "tail -f /var/log/syslog"

while :; do nc -l -p 5558 -c "tail -f /var/log/syslog"; done

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Re: Grep for colums?

2009-02-11 Thread Michael Iatrou
When the date was Wednesday 11 February 2009, Nagy Daniel wrote:

> the "text" is here:
>
> http://pastebin.com/f37214a30
>
> and I only want this string:
>
> http://downloads.sourceforge.net/portableapps/nvu_portable_1.0_rev_5_en-u
>s.paf.exe?download

It seems to me that you only want to grab urls. This should (kind of) do the 
trick:

cat f37214a30.txt | perl -ne 'print "$1\n" if (/href=\"(.+?)\"/ig)'

f37214a30.txt is a file with the snippet you uploaded.

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Re: crontab command and permissions problem

2009-02-11 Thread Michael Iatrou
When the date was Tuesday 10 February 2009, Jordi Moles Blanco wrote:

> I'm having a problem trying to execute the "crontab" command from a perl
> script.
>
> When i call this command from the SNMP system, i get this:
>
> "must be privileged to use -u"
>
> the procedure is...
>
> 1. i create a cron file for a particular user in
> /var/spool/cron/crontabs/username
> 2. i run "crontab -u username /var/spool/cron/crontabs/username"

You are not running the script as root. You may want to consider setuiding 
your script (chmod +s) and install perl-suid.

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Re: apache2 vhost error

2009-02-11 Thread Michael Iatrou
When the date was Wednesday 11 February 2009, Zach Uram wrote:

> I'm trying to add a name-based virtual host in apache2 on my debian
> etch system.
>
> Here is my vhost config:
>
> /etc/apache2/sites-available/darcs
>
> 

- 
+ 

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Re: boot-time script

2009-01-27 Thread Michael Iatrou
When the date was Tuesday 27 January 2009, Umarzuki Mochlis wrote:

> I tried making boot-time script for deluge like below

Isn't this a GUI app? If yes, you need to take into account that X must be 
running.

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Re: expand /var, decrease /home space

2008-12-11 Thread Michael Iatrou
When the date was Friday 12 December 2008, steve wrote:

> is there no fairly straightforward way to expand /var and decrease
> /home?  for some reason when I installed etch quite a while ago in my
> fairly successful attempt at running a webserver it made /var only 2.8
> gig and made /home 280 something gig.
>
> now I want /var to be say 200 gig, and /home alot smaller. for
> obvious reasons. OR, if theres an easier way to accomplish, maybe mount
> /home inside /var? I dont know, reaching for answers lol.
>
> Thanks for any tips or links you can provide.

You could create a symbolic link from /var/web/server/files to /home/htdocs/

Resizing your partitions is error prone and depends on file system, it's a 
process you really want to avoid.

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Re: centralized authentication

2008-12-04 Thread Michael Iatrou
When the date was Wednesday 03 December 2008, Micha Feigin wrote:

> On Wed, 3 Dec 2008 13:37:44 -0500
>
> "Brian Schrock" <[EMAIL PROTECTED]> wrote:
> > A good simple solution is pam mysql. You just stick the users in mysql
> > tables and configure pam and a few other files. In my experience ldap
> > is not quite as simple as libpam-mysql.
> >
> >
> > Brian,
>
> Thanks,
>
> I may have not been clear enough, this can be considered a small secure
> system (4 computers, and although all are connected to the Internet, they
> are behind the university firewall) and all the users can be considered
> trusted users. The communication between the machines is going to be
> private (all connected to each other, internal cluster communication
> isn't visible externally), so even if not encrypted you will have to
> break into the system in the first place in order to snoop.

Well, in that case, you can just name one of them as "master authentication 
server" and rsync(1) /etc/{passwd,shadow} to the rest. :P

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Re: Customizable web based GUI for Debian server and daemon administration?

2008-12-03 Thread Michael Iatrou
When the date was Thursday 04 December 2008, Nick Lidakis wrote:

> I'm asking the list 'cause I don't know what exactly to Google for, so...
>
> Are there any tools that let one build a custom web based (GUI?) page
> that would let users control and configure a small Debian based server?
>
> I'm looking to put something together that would let a non-techie user
> configure music player daemon configuration options from a web page;
> much like users configure a simple SOHO router. I need something that
> could configure MPD as well as NFS or other network attached server
> partitions.
>
> Specifically, I have friends who are very interested in my custom music
> server: ALIX single board computer, Debian based Voyage Linux, MPD, and
> USB audio output; all running from compact flash.  They don't know a
> thing about ssh or using text editors for configuration, so I'm trying
> to figure out the easiest way for them to configure their system. As a
> long time Monowall user, the web based approach first came to mind.

Depending on the configurability you want, a couple of custom made PHP 
scripts that manipulate config files could be enough for a minimal, 
lightweight web-based configuration tool.

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Re: How to stop an active network connection

2008-12-02 Thread Michael Iatrou
When the date was Wednesday 03 December 2008, T o n g wrote:

> Hi,
>
> How can I stop an active network connection? e.g.,

Using iptables(8) you can stop any kind of traffic manually or 
automagically, using something like the following (assuming that you 
normally accept ssh connections):

iptables -I INPUT -p tcp --dport 22 -m state --state NEW -m recent --set
iptables -I INPUT -p tcp --dport 22 -m state --state NEW -m recent \
--update --seconds 3600 --hitcount 4 -j DROP

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Re: crash recovery

2008-11-12 Thread Michael Iatrou
When the date was Wednesday 12 November 2008, tyler wrote:

> Hi,
>
> I just experienced a complete freeze of my laptop - amarok was stuck
> looping through the same second of music from an online stream, and the
> keyboard and mouse stopped responding completely. The screen appeared
> fixed, viewing an xpdf window. I couldn't even switch to a terminal to
> poke around there, as  C-A-F1 etc. didn't respond.
>
> I'm running Lenny with fluxbox, and had just done an aptitude update. I
> don't recall anything heavy, about 40 packages including iceweasel. I
> had also just plugged in to the wall socket after running on battery
> power for several hours.
>
> I have checked /var/log/Xorg0.log.old, and the only EE messages are:

You should also check the other important log files 
(/var/log/{messages,syslog} etc)

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Re: cups-pdf

2008-11-03 Thread Michael Iatrou
When the date was Monday 03 November 2008, Chris wrote:

> On Monday 03 November 2008, Michael Iatrou wrote:
> > When the date was Sunday 02 November 2008, Chris wrote:
> > > On Sunday 02 November 2008, Michael Iatrou wrote:
> > > > When the date was Sunday 02 November 2008, Chris wrote:
> > > > > I am getting very poor results printing to pdf from Firefox, it
> > > > > seems to have worked better in the past.  Changing the settings
> > > > > for image resolution does not help.
> > > >
> > > > Have you tried printing to Postscript and the converting it to pdf
> > > > using ps2pdfwr?
> > >
> > > They look equally bad.  I would attach a file to this email, but I
> > > think lots of list subscribers would not appreciate that.
> >
> > Take a screenshot, save it as png, upload it to imagebin.org and post a
> > link.
> >
> > --
> >  Michael Iatrou (mrlj)
>
> ok.  The first image is a fragment of a payment form from Ebay, the text
> is unreadable
>
> http://imagebin.org/30257
>
> the second image
>
> http://imagebin.org/30259
>
> is a printout of the website
>
> http://www.ncbi.nlm.nih.gov/sites/entrez/
>
> the text is also mangled in this image,
>
> Thanks for any help you can give me.  It used to work fine.  I am running
> an up to date Lanny system.

Interesting, can you also show us the list of fonts it is using? 
(File->Properties->Fonts) Anything peculiar with your Iceweasel/system 
fonts settings?

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Re: Electricity Cutoffs, EXT3 and Filesystems

2008-11-03 Thread Michael Iatrou
When the date was Sunday 02 November 2008, Volkan YAZICI wrote:

> Please, I don't want to start a flamewar between filesystems. But could
> anybody give any recommendations to me?

First of all, avoid XFS at any cost: it has a bad history with power 
failures.

IMHO, if you don't have any good reason for using ext3 (and I actually can 
can't think any) go with ReiserFS.

Still, bare in mind that both reiserfs and ext3 are kind of obsolete: we are 
all waiting brtfs and ext4 to become production-ready :>

-- 
 Michael Iatrou (hluf)


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Re: cups-pdf

2008-11-03 Thread Michael Iatrou
When the date was Sunday 02 November 2008, Chris wrote:

> On Sunday 02 November 2008, Michael Iatrou wrote:
> > When the date was Sunday 02 November 2008, Chris wrote:
> > > I am getting very poor results printing to pdf from Firefox, it seems
> > > to have worked better in the past.  Changing the settings for image
> > > resolution does not help.
> >
> > Have you tried printing to Postscript and the converting it to pdf
> > using ps2pdfwr?
> >
> They look equally bad.  I would attach a file to this email, but I think
> lots of list subscribers would not appreciate that.

Take a screenshot, save it as png, upload it to imagebin.org and post a 
link.

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 Michael Iatrou (mrlj)


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Re: Processes comminicating with "outside" sites

2008-11-02 Thread Michael Iatrou
When the date was Sunday 02 November 2008, Jeffrey B. Green wrote:

> So I'm wondering, is there a list that itemizes all outside
> communications and associates them with the relevant package/file? 

You need something like the output of:

# netstat -ntuap

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 Michael Iatrou (fphc)


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Re: cups-pdf

2008-11-02 Thread Michael Iatrou
When the date was Sunday 02 November 2008, Chris wrote:

> I am getting very poor results printing to pdf from Firefox, it seems to
> have worked better in the past.  Changing the settings for image
> resolution does not help.

Have you tried printing to Postscript and the converting it to pdf using  
ps2pdfwr?

-- 
 Michael Iatrou (gtgz)


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Re: Adobe Reader install fails - out of space

2008-11-01 Thread Michael Iatrou
When the date was Saturday 01 November 2008, Dennis Wicks wrote:

> The root partition is out of space and suspect that is the
> problem, but what do I know!

df(1) is your friend.

> Any way, does anybody know how I can fis this problem or
> change the sizes of my file systems without a reinstall?

You can try to free some space using:

# apt-get clean

To resize your partitions, parted(8) is the tool you are looking for.

-- 
 Michael Iatrou (fdiu)


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