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> Today's Topics:
> 
>   1. xargs guide (Steve Litt)
>   2. Re: systemd, mbr boot record recovery, but now can't mount
>      anything (?) (Leroy Tennison)
>   3. Re: xargs guide (Pesto)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Wed, 29 Jul 2015 21:46:06 -0400
> From: Steve Litt <slitt at troubleshooters.com>
> To: discuss at ntlug.org
> Subject: [NTLUG:Discuss] xargs guide
> Message-ID: <20150729214606.7526dee4 at mydesq2.domain.cxm>
> Content-Type: text/plain; charset=US-ASCII
> 
> Hi all,
> 
> xargs is a gender-changer type program that adapts one program's stdout
> to the next program's command line arguments. It's extremely handy for
> shell scripting, but it can be tricky. I've written a short guide for
> xargs that shows how to get around the usual xargs landmines:
> 
> http://www.troubleshooters.com/linux/xargs.htm
> 
> Hope you like it.
> 
> SteveT
> 
> Steve Litt 
> July 2015 featured book: Rapid Learning for the 21st Century
> http://www.troubleshooters.com/rl21
> 
> 
> 
> ------------------------------
> 
> Message: 2
> Date: Thu, 30 Jul 2015 00:31:09 -0500
> From: Leroy Tennison <leroy.tennison at verizon.net>
> To: NTLUG Discussion List <discuss at ntlug.org>
> Subject: Re: [NTLUG:Discuss] systemd, mbr boot record recovery, but
>    now can't mount anything (?)
> Message-ID: <55B9B69D.6070309 at verizon.net>
> Content-Type: text/plain; charset=windows-1252; format=flowed
> 
> Well, after starting to write I see the problem is solved - and was due 
> to the same thing which has happened to me, maybe a little additional 
> information will help someone else.  I've booted to emergency mode twice 
> (openSuSE 13.1), both times (once each on two machines) it was due to 
> fstab.  First time I had reformatted a partition to NTFS, probably from 
> ext3 or 4, to make a shared partition for that other OS.  Needless to 
> say, that changed the UUID which had to be fixed in fstab.
> 
> Second time I had dd'ed a 160GB drive onto a 1TB drive and fstab was 
> using /dev/disk/by-id/...  Of course, the drive model changed. However, 
> even replacing the drive model with the new one didn't help, had to 
> switch to UUIDs.  In both of my cases I booted to a DVD and was able to 
> mount partitions and gather information using blkid.
> 
> Point of all this is that no method of referencing partitions is safe: 
> Both /dev/[hd?|sd?] and /dev/disk/by-id/ are vulnerable to hardware 
> changes.  UUID is vulnerable to partition changes.  If only we had a 
> better way, maybe systemd v2 (I'm JOKING, I fully despise systemd for 
> the same reason Chris does).
> 
> One other option had you needed it would have been to get a trial 
> version of a disk recovery program and see what that tells you.  I did 
> this a few years back and discovered the partition contents were 
> thoroughly scrambled.  The trial only allowed reading but that was 
> enough to discover that buying it was useless because there was nothing 
> significant to recover.  In that situation what I finally discovered the 
> hard way was that something on the motherboard was trashing drives 
> (first troubleshooting step was to swap drives, then it happened again a 
> month later, new motherboard and the problem disappeared).
> 
> 
>> On 07/27/2015 03:09 AM, Christopher Cox wrote:
>> So, I needed to reconstruct my boot record.  I booted into rescue mode 
>> and mounted my root (/mnt), mounted (bind) the special dirs: dev, proc 
>> and sys and then did a chroot to /mnt.
>> 
>> Then I could recreate a grub2 grub.cnf file with grub2-mkconfig. I 
>> then wrote a new grub using grub2-install.
>> 
>> No errors.
>> 
>> On boot, it starts to load by the goes to emergency mode (systemd) and 
>> I see my / is mounted ok, but the reason for the failure was because 
>> none of the other filesystems would mount.  Swap won't mount, and my 
>> /home won't mount.  In fact, nothing will mount even in "emergency" 
>> mode.  Nothing will fsck either.
>> 
>> All attempts to get at filesystems for mounting or doing an fsck says 
>> "no" because "it's already mounted" or "it's busy"... but nothing 
>> except / is actually mounted.
>> 
>> (I am sooooo very glad that booting is a complete mess now)
>> 
>> Anybody else have this happen to them and figure a way out?
>> 
>> You won't have this issue unless you're on a newer system using 
>> systemd and grub2 (IMHO).... In this case it's openSUSE 13.2.
>> 
>> Hints welcome.
>> 
>> _______________________________________________
>> http://www.ntlug.org/mailman/listinfo/discuss
> 
> 
> 
> 
> ------------------------------
> 
> Message: 3
> Date: Thu, 30 Jul 2015 07:24:26 -0500
> From: Pesto <dawjer at gmail.com>
> To: NTLUG Discussion List <discuss at ntlug.org>
> Subject: Re: [NTLUG:Discuss] xargs guide
> Message-ID:
>    <CAJ5YSrz8mjtxtPVQ9MXxhg4t871wJPqduxhDLS9uk=-NbjvRKw at mail.gmail.com>
> Content-Type: text/plain; charset=UTF-8
> 
> As someone who has used xargs since the mid '90s I gotta say this is well
> done. I learned stuff. Thanks.
> 
> 
> pesto
> 
> On Wed, Jul 29, 2015 at 8:46 PM, Steve Litt <slitt at troubleshooters.com>
> wrote:
> 
>> Hi all,
>> 
>> xargs is a gender-changer type program that adapts one program's stdout
>> to the next program's command line arguments. It's extremely handy for
>> shell scripting, but it can be tricky. I've written a short guide for
>> xargs that shows how to get around the usual xargs landmines:
>> 
>> http://www.troubleshooters.com/linux/xargs.htm
>> 
>> Hope you like it.
>> 
>> SteveT
>> 
>> Steve Litt
>> July 2015 featured book: Rapid Learning for the 21st Century
>> http://www.troubleshooters.com/rl21
>> 
>> _______________________________________________
>> http://www.ntlug.org/mailman/listinfo/discuss
> 
> 
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