- Roundtable - muug.ca

MUUG Meeting, Feb 12, 7:30pm -- System Call Tracing
by gedetil＠cs.umanitoba.ca 05 Feb '13

05 Feb '13

The Manitoba UNIX User Group (MUUG) will be holding its next monthly meeting on Tuesday, February 12. The meeting topic for this month is as follows: System Call Tracing This month's presentation will feature Adam Thompson, who will show how to profile and troubleshoot UNIX processes without needing access to source code, through the use of system-call tracing. Learn where, when, why (and for a few of these, how) to use dtrace, dtruss, ftrace, ktrace/kdump, ltrace, LTTng, par, ProbeVue, ptrace, strace, System Tap, tusc, trace, and truss to find out exactly what that troublesome program is doing behind the scenes. The group holds its general meetings at 7:30pm on the second Tuesday of every month from September to June. (There are no meetings in July and August.) Meetings are open to the general public; you don't have to be a MUUG member to attend. ********************************************************************** Please note our *NEW* meeting location: Room 1L08, Lockhart Hall, University of Winnipeg, entrance on Ellice Ave. between Spence St. and Balmoral St. Parking is available on the surrounding streets and in the lots on nearby streets. Look for signage once you're at the building, or ask a security guard. ********************************************************************** For more information about MUUG, and its monthly meetings, check out their Web server: http://www.muug.mb.ca/ Help us promote this month's meeting, by putting this poster up on your workplace bulletin board or other suitable public message board: http://www.muug.mb.ca/meetings/MUUGmeeting.pdf -- Gilbert E. Detillieux E-mail: <gedetil(a)muug.mb.ca> Manitoba UNIX User Group Web: http://www.muug.mb.ca/ PO Box 130 St-Boniface Phone: (204)474-8161 Winnipeg MB CANADA R2H 3B4 Fax: (204)474-7609

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UPS batteries
by Kevin McGregor 04 Feb '13

04 Feb '13

Hey knowledgeable geek people: Where's a good place to get replacement UPS batteries? I need 1 or 2 12V 9Ah batteries. Is there any place open on the weekend that sells these? Kevin

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Awwwwww. Raspberry Pi?
by Kevin McGregor 31 Jan '13

31 Jan '13

The "Awwwwwww" part: I think my SheevaPlug is dead. It stopped responding to SSH (or, well, ping), and when I tried connecting via the funky USB/serial port, my PC doesn't even detect that the SheevaPlug is plugged in, let alone attempt a connection via PuTTY. Note: the power light comes on steady, as do both the green and amber lights on the Ethernet port. So, what are my options? 1. Maybe it's the power supply. These ones are known for going bad. Anyone want to try to fix it? Hey -- that would be a cool presentation: Fix a SheevaPlug PS in real-time and see if we can get the thing to boot! Okay, maybe not. 2. Buy another SheevaPlug? Too expensive for my budget. 3. Buy a Raspberry Pi? Can you get them locally? Or order them online from a reputable Canadian supplier? Discuss.

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Hard drives
by Kevin McGregor 30 Jan '13

30 Jan '13

I need to replace my (degraded mode :-( ) 2 TB RAID 5 array ASAP. I'd like ~3 TB of usable space and RAID 1 is preferred over RAID 5/6. Would anyone like to suggest replacement drives? Kevin

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Small Linux distro?
by Kevin McGregor 30 Jan '13

30 Jan '13

I have a Pentium III 1 GHz (?) laptop with 512 MB (?) RAM and a 80 GB (?) hard drive, 1024x768 display. Which distro would run half-decently on this, with GUI/desktop?

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Grep supports Perl regexp! Who knew?
by Adam Thompson 29 Jan '13

29 Jan '13

Command Line Magic (@climagic) tweeted at 11:58 AM on Wed, Jan 09, 2013: grep -o -P "(?<=CRON\[)\d+" /var/log/syslog # GNU grep supports perl regex expressions. This gives only the PID on CRON lines in syslog. (https://twitter.com/climagic/status/289068621362241537) _Adam

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Check Point SBX-166LHGE-2
by Kevin McGregor 24 Jan '13

24 Jan '13

Is there anything useful that can be done with this device? It has no wireless; it's just a wired router in a nice little orange and blue metal box. Come to think of it, you might be able to fit a Raspberry Pi in it! Anyone want one or several? Kevin

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Re: [RndTbl] Lost messages/postings
by Adam Thompson 23 Jan '13

23 Jan '13

Once the mailman software has had its way with your message, it is no longer the same (identical) message so that isn't the case in any event. However, you're the third person lately to complain about missing their own posts. Gilbert/Bill, is it possible the list default setting for self-copy got changed? I don't know where to look... -Adam Hartmut W Sager <hwsager(a)marityme.net> wrote: >_______________________________________________ >Roundtable mailing list >Roundtable(a)muug.mb.ca >http://www.muug.mb.ca/mailman/listinfo/roundtable

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Dimensional hard drives?
by Adam Thompson 22 Jan '13

22 Jan '13

Ever double-check an assumption, only to find it false, and feel like the rug just got yanked out from under your feet? Go measure the width of a so-called 3.5" hard drive. Yeah, go ahead. It's 4" wide. Now go measure the width of a so-called 2.5" hard drive. Uh-huh... it's 2.75" wide. I just (re-?)discovered that and felt just as cheated as when I found out that the nominal sizes of dimensional lumber are complete B.S.! I knew this once upon a time, but I guess I forgot... 5.25" & 3.5" refer to the fact that it fits into the bay where you would have been able to fit a floppy drive accommodating the corresponding-size floppy disk. I can't find any derivation for why we call a 2.75" drive a 2.5" drive, since there's no such thing as a 2.5" floppy[1]! Perhaps the internal platter is 2.5" wide? (See: http://en.wikipedia.org/wiki/Hard_disk_drive#Form_factors) -Adam [1] OK, yes, there a 2.5" floppy did exist briefly, but it was never any sort of standard and I've never seen one in person AFAIK. FYI, the Sony micro-floppy format was not 2.5", it was 90mm (closer to 2", anyway).

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Hardware dimensions
by Michael Doob 22 Jan '13

22 Jan '13

On 13-01-21 11:08 PM, roundtable-request(a)muug.mb.ca wrote: > > Message: 1 > Date: Mon, 21 Jan 2013 15:18:35 -0600 > From: "Adam Thompson" <athompso(a)athompso.net> > To: "MUUG Roundtable" <roundtable(a)muug.mb.ca> > Subject: [RndTbl] Dimensional hard drives? > Message-ID: <006b01cdf81c$dfda70a0$9f8f51e0$(a)athompso.net> > Content-Type: text/plain; charset="UTF-8" > > Ever double-check an assumption, only to find it false, and feel like the rug just got yanked out from under your feet? > > Go measure the width of a so-called 3.5" hard drive. Yeah, go ahead. It's 4" wide. Now go measure the width of a so-called 2.5" hard drive. Uh-huh... it's 2.75" wide. I just (re-?)discovered that and felt just as cheated as when I found out that the nominal sizes of dimensional lumber are complete B.S.! > > I knew this once upon a time, but I guess I forgot... 5.25" & 3.5" refer to the fact that it fits into the bay where you would have been able to fit a floppy drive accommodating the corresponding-size floppy disk. I can't find any derivation for why we call a 2.75" drive a 2.5" drive, since there's no such thing as a 2.5" floppy[1]! Perhaps the internal platter is 2.5" wide? > > (See: http://en.wikipedia.org/wiki/Hard_disk_drive#Form_factors) > If it means anything, I just measured a 5 1/4 inch floppy, and it is indeed 5 1/4 inches wide. I also measured an 8 inch floppy (am I a packrat or what?) and it is 8 inches wide. I suppose the 5 1/4 inch drive was supposed to hold a 5 1/4 inch floppy. At least that would make the name logical. Cheers, Michael -- ------------------------------------------------------------------ Michael Doob Telephone: (204) 474-9796 Department of Mathematics Fax: (204) 474-7606 University of Manitoba email: Michael_Doob(a)umanitoba.ca Winnipeg, MB, Canada R3T 2N2 ------------------------------------------------------------------

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