Re: live and learn

2010-06-09 Thread Mike McCarty
Theron Stanford wrote:
> On Tue, Jun 8, 2010 at 11:45 PM, Mike McCarty
>  wrote:

>> Possibly. However, who prints the book? Mostly, I was cut'n'pasting
>> the commands.
> 
> I print the book.  However, I print it 9-up to save paper.  I like
> having the hard copy to read on the train.

NINE up? How do you read it? With a microscope? You must be using
A4 paper at least. I'd find four up difficult on letter (which is
what I use).

However, as a laid off telecomm engineer, I definitely do what I can
to save on printing costs. Like not printing at all. Always two side,
often two up. I find four up difficult to read.

[...]

> that I usually guess right.  (I recall once spending quite some time
> trying to figure out why GRUB couldn't find menu.1st.)  And during my
> last build I couldn't figure out why
> 
> cp -sv libbz2.so* /lib
> 
> wouldn't work.  (The options are -av, of course.)

:-)

Mike
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Re: live and learn

2010-06-09 Thread linux fan
On 6/8/10, Neal Murphy  wrote:

> ... You'll learn to pause before hitting .
>

I learned that lesson very quickly. It is extremely important.

My system wouldn't last long without backups.
Speaking of backups and rescue disks, I am using an "rsync snapshots"
style of backup. It does not compress, yet it can save multiple
"copies" of a system at different points in time using remarkable
little disk space. Any "copy" can be rsynced to any mount point and so
I can recover or load up any system "copy" in around 20 minutes.  I
have several LFS builds (2 are 6.6), a few Fedoras, and miscellaneous
others. I loaded and ran FC4 the other day. I made a snapshot of my
current system yesterday, before installing some experimental stuff.

The backup might have looked something like this:
mount LABEL=BACK_UPS /back_up
back_up snapdir=/back_ups/LFS-6-2

My last restoration might have looked something like this:
mount LABEL=BACK_UPS /back_ups
mount /dev/[bla-bla] /mnt
cd /mnt
R-M-minus-R-star (you never write that in a post)
rsync -aH --numeric-ids /back_ups/LFS-6-2/root_fs/back_up.0/. /mnt/

More info on these rsync snapshots in case anyone is curious is here
http://linux-fan-alfs.blogspot.com/2008/03/system-backups.html

Disk size has increased and disk cost has decreased to the point that
I have much more available disk space than I need (it's hard to find a
tiny 20GB disk any more.) Actually I have 4 various sized disks
including 2 500GB drives and a few old spare drives lying aroung. Each
one of the disks ha one partition that is the "logical" type that is
reported by fdisk as "f  W95 Ext'd (LBA)". The "logical" partition can
contain partitions 5-15. More than one of the disks has a partition
dedicated to back ups. I'm lazy and don't regularly delete old copies.

Most of the systems in the scheme are bootable, so I automatically
have numerous "rescue" systems. I also have grub boot cd and lfs
livecd. I've learned to expect that I'll occasionally (or regularly as
the case may be) break something. Many times, one of the "rescue"
systems has been called upon to save the day, even if only for 1 file.
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Re: live and learn

2010-06-09 Thread Theron Stanford
On Tue, Jun 8, 2010 at 11:45 PM, Mike McCarty
 wrote:
> Neal Murphy wrote:
>
>> A possible future enhancement to 'the book' might be to incorporate 
>> checkboxes
>> that a newbie would check off as she performs each step. Extra work? Yes. But
>> worth it to make each step clearer? Yes again.
>
> Possibly. However, who prints the book? Mostly, I was cut'n'pasting
> the commands.

I print the book.  However, I print it 9-up to save paper.  I like
having the hard copy to read on the train.

Unfortunately, this sometimes has the side-effect of making 1 (one)
and l (ell) difficult to distinguish, though I've built enough times
that I usually guess right.  (I recall once spending quite some time
trying to figure out why GRUB couldn't find menu.1st.)  And during my
last build I couldn't figure out why

cp -sv libbz2.so* /lib

wouldn't work.  (The options are -av, of course.)

Theron
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Re: HSR's

2010-06-09 Thread Simon Geard
On Tue, 2010-06-08 at 19:54 -0400, Neal Murphy wrote:
> So, in the case that spawned this thread, the used could have continued to 
> use 
> his shell, albeit vey carefully and judiciously, until he exitted that shell. 
> Even if he performed an 'rm -rf /', his shell would continue to run and he 
> would continue to be able to use shell built-ins until he exitted that shell. 
> At that point, only the root directory, '.' and '..' would be accessible.

Not necessarily - it depends on what else is happening on the system at
the same time. A few months back, I accidentally removed part of udev,
and the system died almost instantly - I never found out exactly what
went wrong, but speculate that something caused /dev to go missing,
which locked up X...

That was fun... ended up running off a Ubuntu live-boot for a week until
I could get a new LFS build done... :(

Simon.


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