- luv-main - luv.asn.au

Re: Reworking filenames
by Erik Christiansen 05 May '17

05 May '17

On 05.05.17 20:16, Mark Trickett via luv-main wrote: > I need to learn perl, For other tasks, perhaps? > but will do a lot better around other people, which is not so easy > when in a rural area with less population and an excess of Windows and > mac users who have no interest in more than using the bare minimum of > provided utilities. Have you tried Russel's elegantly minimalist solution? Just trying the first action on the command line: $ n="01032017(001).jpg" $ echo $(echo $n|cut -c 5-8)$(echo $n|cut -c 3-4)$(echo $n|cut -c 1-2) gives a very fine: 20170301 The "(001).jpg" is added in the third line. If time is short, and mental energy drained by other demands, then KISS is key, so you can gain a quick success, I figure. (This one isn't a task which needs later upscaling.) Erik

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Old laptops needed
by Russell Coker 05 May '17

05 May '17

A friend will be going to Vietnam soon and has some baggage space for laptops for Vietnamese kids. They don't need to be new, and don't need to be fully working (broken display and keyboard isn't necessarily a problem as long as VGA and USB ports work). They will all be used for Linux. But if you don't know the hardware specs then tell me the Windows version listed on the sticker (IE a Windows 7 laptop is more desirable than a Windows XP laptop). Contact me off-list if you have something to spare that I can collect within 6 days. Thanks. -- Sent from my Nexus 6P with K-9 Mail.

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Podcast: James Turnbull on Declarative Programming with Terraform - given tomorrow's talk
by Rodney Brown 01 May '17

01 May '17

http://www.se-radio.net/2017/04/se-radio-episode-289-james-turnbull-on-decl… SE-Radio Episode 289: James Turnbull on Declarative Programming with Terraform James Turnbull rejoins the show with Robert Blumen <http://www.se-radio.net/team/#Blumen> for a conversation mostly about Terraform, as well as a bit about Puppet. Terraform is a declarative programming tool for automating infrastructure resource creation; it targets resource providers, such as Amazon AWS, Microsoft Azure, Digital Ocean, and other cloud and SAAS back ends. The discussion explores the programming language used by Terraform (TF); what TF does when it runs; why a declarative language is a good fit for infrastructure resource creation; and how infrastructure operation is becoming more like programming, with a build pipeline, testing, and deployment. The episode considers TF’s internals, its similarities and differences with Puppet, and some speculation about whether declarative programming is the future of programming. About SE-Radio Software Engineering Radio is a podcast targeted at the professional software developer. The goal is to be a lasting educational resource, not a newscast. Three to four times per month, we publish a new episode talking to experts from the software engineering world about the full range of topics that matter to professional developers. All SE Radio episodes feature original content; we don’t record conferences or talks given in other venues. SE Radio is managed by the volunteers and staff of IEEE Software, a leading technical magazine for software professionals published by the IEEE Computer Society. All content is licensed under the Creative Commons 2.5 license. SE Radio was founded in January 2006 by Markus Voelter. It joined forces with IEEE Software in February 2012.

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Laptop free to good home
by Andrew Pam 29 Apr '17

29 Apr '17

I'm trying to cut down on the number of computers in my house. Here's the first one I'm offering free to anyone who wants it: Compaq Evo N410c laptop with docking bay and a D-Link DWL-G630 PC-card WiFi adapter 1.2GHz Pentium III-M, 1GB RAM, 63GB HDD, 1024x768 LCD with ATI Radeon Mobility M6 LY chipset Ports: VGA, audio, 2xUSB, IRDA, internal modem, Ethernet, PC-card slot, serial, parallel and composite video out (!) The docking bay has stereo speakers, 2x drive bays with a DVD drive and a 3.5" floppy drive and the following ports: VGA, audio, 2xUSB, Ethernet, PS/2 keyboard and mouse, serial and parallel. I can bring it to the LUV meeting on Tuesday night, or you can pick it up from my office in North Richmond during office hours next week. Cheers, Andrew

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reported nasty bash bug -- arithmetic problem, incorrect return code with ((var++)) when var is 0 before operation
by Andrew McGlashan 29 Apr '17

29 Apr '17

Configuration Information [Automatically generated, do not change]: Machine: x86_64 OS: linux-gnu Compiler: gcc Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' -DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-pc-linux-gnu' -DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL -DHAVE_CONFIG_H -I. -I../. -I.././include -I.././lib -Wdate-time -D_FORTIFY_SOURCE=2 -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -Wall uname output: Linux andrewm-Satellite-P50-A 4.4.0-72-generic #93-Ubuntu SMP Fri Mar 31 14:07:41 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux Machine Type: x86_64-pc-linux-gnu Bash Version: 4.3 Patch Level: 42 Release Status: release Description: The return code from ((i++)) operation is different when i has an initial value of 0. This problem was discovered when running run a bash script with "set -ue" and having "((i++))" as the last command in a loop. Repeat-By: The following script will quit with an error after the first iteration due to the return code errantly being 1. #!/bin/bash set -eu i=0 for a in a b c do echo "${a}" ((i++)) done NB: If i starts as 1, the script works as expected. Also, using ((i+=1)) works fine, but I prefer the ((i++)) format. Proof outside a loop: $ c=0;((c++));echo $? 1 $ c=1;((c++));echo $? 0 Only the above was reported, but this also yeilds more proof: $ for c in {-3..3};do ((c++));echo $? "${c}";done 0 -2 0 -1 0 0 1 1 0 2 0 3 0 4 Cheers AndrewM

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smaller pavucontrol
by Tim Connors 28 Apr '17

28 Apr '17

Is there a smaller version of pavucontrol that can access all the mixers and give a quick visual indication of current volume levels, but still fit on the screen when you have more than 5 or 6 audio applications open at once? -- Tim Connors

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Connecting to Wi-Fi, alternatives to network manager
by Mark Trickett 26 Apr '17

26 Apr '17

Hello All, Having a Telstra supplied Netgear Mobile modem, nominally a Telstra4GA device, I am not happy with the way that Network Manager connects, or fails, silently. What software and procedures do you use to connect to Wi-Fi networks? I am looking for something I can largely script, but also adapt to coping with connecting to other devices elsewhere now and then. I am also wanting something a little more informative and verbose, I may not initially understand all the returned information, but I can work on that. Regards, Mark Trickett

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SNMP monitoring
by Brian May 25 Apr '17

25 Apr '17

Hello, What is the easiest way of monitor SNMP data from a small number of VMs, servers, routers, switches and UPS? Previously I used zenoss for this. It is good in that I can tell it to monitor a switch, and I automatically get statistics recorded for every port on the switch (without having to configure each port manually). On the downside zenoss seems to be bulky and complicated at times. Or at least my legacy version (3.2.1-0) - I doubt this has changed although I might be mistaken. However I noticed that I am on a legacy version, and the latest version only seems to support RHEL/Centos based systems (my current install is on Debian). So considering that I might need to do a complete reinstall anyway, I thought I might us well check to seem what other options there are. http://wiki.zenoss.org/Install_Zenoss Thanks. -- Brian May <brian(a)linuxpenguins.xyz> https://linuxpenguins.xyz/brian/

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oom-killer being invoked instead of swapping
by Kim Oldfield 21 Apr '17

21 Apr '17

Hi, I have a raspberry pi 2 on which I recently installed Ubuntu 16.04.2. After the install oom-killer has been killing processes, even when there is 1GB of swap free. I would have expected the kernel to swap something out rather than killing processes. How can I use swap rather than having oom-killer killing processes? Here is a typical oom-kill as recorded by syslog: Apr 21 15:45:01 pi2 kernel: [72182.070173] sh invoked oom-killer: gfp_mask=0x24004c0, order=2, oom_score_adj=0 Apr 21 15:45:01 pi2 kernel: [72182.070196] sh cpuset=/ mems_allowed=0 Apr 21 15:45:01 pi2 kernel: [72182.070221] CPU: 2 PID: 10341 Comm: sh Not tainted 4.4.0-1052-raspi2 #59-Ubuntu Apr 21 15:45:01 pi2 kernel: [72182.070228] Hardware name: BCM2709 Apr 21 15:45:01 pi2 kernel: [72182.070265] [<80111e94>] (unwind_backtrace) from [<8010d100>] (show_stack+0x20/0x24) Apr 21 15:45:01 pi2 kernel: [72182.070286] [<8010d100>] (show_stack) from [<8056a52c>] (dump_stack+0xc8/0x10c) Apr 21 15:45:01 pi2 kernel: [72182.070308] [<8056a52c>] (dump_stack) from [<802a888c>] (dump_header+0x68/0x1c8) Apr 21 15:45:01 pi2 kernel: [72182.070327] [<802a888c>] (dump_header) from [<80247800>] (oom_kill_process+0x36c/0x4b4) Apr 21 15:45:01 pi2 kernel: [72182.070344] [<80247800>] (oom_kill_process) from [<80247bb8>] (out_of_memory+0x1f8/0x35c) Apr 21 15:45:01 pi2 kernel: [72182.070361] [<80247bb8>] (out_of_memory) from [<8024d93c>] (__alloc_pages_nodemask+0xd38/0xd78) Apr 21 15:45:01 pi2 kernel: [72182.070378] [<8024d93c>] (__alloc_pages_nodemask) from [<8024d99c>] (__get_free_pages+0x20/0x64) Apr 21 15:45:01 pi2 kernel: [72182.070395] [<8024d99c>] (__get_free_pages) from [<801190d4>] (pgd_alloc+0x28/0x11c) Apr 21 15:45:01 pi2 kernel: [72182.070411] [<801190d4>] (pgd_alloc) from [<80121520>] (mm_init+0xd8/0x170) Apr 21 15:45:01 pi2 kernel: [72182.070427] [<80121520>] (mm_init) from [<80121bbc>] (mm_alloc+0x5c/0x68) Apr 21 15:45:01 pi2 kernel: [72182.070445] [<80121bbc>] (mm_alloc) from [<802b3ecc>] (do_execveat_common+0x280/0x744) Apr 21 15:45:01 pi2 kernel: [72182.070463] [<802b3ecc>] (do_execveat_common) from [<802b4624>] (SyS_execve+0x40/0x48) Apr 21 15:45:01 pi2 kernel: [72182.070481] [<802b4624>] (SyS_execve) from [<80108c60>] (ret_fast_syscall+0x0/0x1c) Apr 21 15:45:01 pi2 kernel: [72182.070489] Mem-Info: Apr 21 15:45:01 pi2 kernel: [72182.070510] active_anon:7968 inactive_anon:36348 isolated_anon:0 Apr 21 15:45:01 pi2 kernel: [72182.070510] active_file:35828 inactive_file:127471 isolated_file:0 Apr 21 15:45:01 pi2 kernel: [72182.070510] unevictable:0 dirty:5 writeback:0 unstable:0 Apr 21 15:45:01 pi2 kernel: [72182.070510] slab_reclaimable:15804 slab_unreclaimable:4482 Apr 21 15:45:01 pi2 kernel: [72182.070510] mapped:4644 shmem:1239 pagetables:434 bounce:0 Apr 21 15:45:01 pi2 kernel: [72182.070510] free:2363 free_pcp:0 free_cma:15 Apr 21 15:45:01 pi2 kernel: [72182.070554] Normal free:9452kB min:3836kB low:4792kB high:5752kB active_anon:31872kB inactive_anon:145392kB active_file:143312kB inactive_fi le:509884kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:966656kB managed:942128kB mlocked:0kB dirty:20kB writeback:0kB mapped:18576kB shmem:4956kB slab_r eclaimable:63216kB slab_unreclaimable:17928kB kernel_stack:1656kB pagetables:1736kB unstable:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:60kB writeback_tmp:0kB page s_scanned:16 all_unreclaimable? no Apr 21 15:45:01 pi2 kernel: [72182.070563] lowmem_reserve[]: 0 0 Apr 21 15:45:01 pi2 kernel: [72182.070577] Normal: 1251*4kB (UME) 579*8kB (UME) 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 9636kB Apr 21 15:45:01 pi2 kernel: [72182.070625] 165625 total pagecache pages Apr 21 15:45:01 pi2 kernel: [72182.070635] 1119 pages in swap cache Apr 21 15:45:01 pi2 kernel: [72182.070643] Swap cache stats: add 23103, delete 21984, find 25546/29364 Apr 21 15:45:01 pi2 kernel: [72182.070650] Free swap = 1004812kB Apr 21 15:45:01 pi2 kernel: [72182.070656] Total swap = 1048572kB Apr 21 15:45:01 pi2 kernel: [72182.070663] 241664 pages RAM Apr 21 15:45:01 pi2 kernel: [72182.070669] 0 pages HighMem/MovableOnly Apr 21 15:45:01 pi2 kernel: [72182.070675] 6132 pages reserved Apr 21 15:45:01 pi2 kernel: [72182.070681] 2048 pages cma reserved Apr 21 15:45:01 pi2 kernel: [72182.070688] [ pid ] uid tgid total_vm rss nr_ptes nr_pmds swapents oom_score_adj name Apr 21 15:45:01 pi2 kernel: [72182.070717] [ 345] 0 345 1225 228 6 0 40 0 systemd-journal Apr 21 15:45:01 pi2 kernel: [72182.070730] [ 383] 0 383 3124 36 7 0 3 0 lvmetad Apr 21 15:45:01 pi2 kernel: [72182.070744] [ 431] 0 431 2997 145 8 0 128 -1000 systemd-udevd Apr 21 15:45:01 pi2 kernel: [72182.070758] [ 684] 100 684 3064 123 7 0 28 0 systemd-timesyn Apr 21 15:45:01 pi2 kernel: [72182.070771] [ 701] 0 701 592 38 6 0 4 0 rpc.idmapd Apr 21 15:45:01 pi2 kernel: [72182.070783] [ 805] 0 805 834 287 6 0 33 0 systemd-logind Apr 21 15:45:01 pi2 kernel: [72182.070796] [ 808] 0 808 346 63 5 0 3 0 acpid Apr 21 15:45:01 pi2 kernel: [72182.070808] [ 815] 0 815 1130 129 7 0 19 0 cron Apr 21 15:45:01 pi2 kernel: [72182.070821] [ 819] 0 819 7684 292 10 0 1 0 lxcfs Apr 21 15:45:01 pi2 kernel: [72182.070834] [ 822] 107 822 1226 296 6 0 48 -900 dbus-daemon Apr 21 15:45:01 pi2 kernel: [72182.070846] [ 831] 104 831 7794 168 9 0 122 0 rsyslogd Apr 21 15:45:01 pi2 kernel: [72182.070859] [ 833] 0 833 9084 635 12 0 63 0 accounts-daemon Apr 21 15:45:01 pi2 kernel: [72182.070871] [ 836] 0 836 712 55 6 0 33 0 atd Apr 21 15:45:01 pi2 kernel: [72182.070883] [ 854] 0 854 8711 305 13 0 57 0 polkitd Apr 21 15:45:01 pi2 kernel: [72182.070896] [ 1002] 113 1002 29479 1911 30 0 4528 0 named Apr 21 15:45:01 pi2 kernel: [72182.070909] [ 1012] 0 1012 1997 225 7 0 104 -1000 sshd Apr 21 15:45:01 pi2 kernel: [72182.070922] [ 1015] 114 1015 2560 865 10 0 945 0 dhcpd Apr 21 15:45:01 pi2 kernel: [72182.070935] [ 1045] 0 1045 1359 97 6 0 80 0 rpcbind Apr 21 15:45:01 pi2 kernel: [72182.070948] [ 1049] 0 1049 1420 516 6 0 119 0 rpc.mountd Apr 21 15:45:01 pi2 kernel: [72182.070962] [ 1143] 0 1143 832 118 6 0 17 0 irqbalance Apr 21 15:45:01 pi2 kernel: [72182.070974] [ 1170] 0 1170 862 61 5 0 25 0 agetty Apr 21 15:45:01 pi2 kernel: [72182.070987] [ 1172] 0 1172 908 10 6 0 19 0 agetty Apr 21 15:45:01 pi2 kernel: [72182.071000] [ 1254] 0 1254 10969 1791 16 0 710 0 fail2ban-server Apr 21 15:45:01 pi2 kernel: [72182.071012] [ 1263] 0 1263 2225 1240 8 0 45 0 apache2 Apr 21 15:45:01 pi2 kernel: [72182.071025] [ 1358] 0 1358 7968 143 9 0 65 0 master Apr 21 15:45:01 pi2 kernel: [72182.071037] [ 1360] 112 1360 8020 335 9 0 45 0 qmgr Apr 21 15:45:01 pi2 kernel: [72182.071050] [ 1716] 1000 1716 1581 32 8 0 409 0 systemd Apr 21 15:45:01 pi2 kernel: [72182.071062] [ 1720] 1000 1720 1813 33 7 0 397 0 (sd-pam) Apr 21 15:45:01 pi2 kernel: [72182.071075] [ 1912] 0 1912 2945 119 11 0 165 0 sshd Apr 21 15:45:01 pi2 kernel: [72182.071088] [ 1946] 1000 1946 4041 1235 14 0 146 0 sshd Apr 21 15:45:01 pi2 kernel: [72182.071100] [ 1947] 1000 1947 36295 35191 75 0 10 0 unison Apr 21 15:45:01 pi2 kernel: [72182.071114] [ 6694] 33 6694 58348 900 36 0 45 0 apache2 Apr 21 15:45:01 pi2 kernel: [72182.071127] [ 6695] 33 6695 58092 899 36 0 45 0 apache2 Apr 21 15:45:01 pi2 kernel: [72182.071141] [10335] 112 10335 7986 721 8 0 0 0 pickup Apr 21 15:45:01 pi2 kernel: [72182.071153] [10337] 0 10337 1470 504 7 0 5 0 cron Apr 21 15:45:01 pi2 kernel: [72182.071166] [10338] 1000 10338 365 101 4 0 0 0 sh Apr 21 15:45:01 pi2 kernel: [72182.071179] [10339] 1000 10339 3084 2179 10 0 0 0 optus-status Apr 21 15:45:01 pi2 kernel: [72182.071191] [10340] 1000 10340 365 93 5 0 0 0 sh Apr 21 15:45:01 pi2 kernel: [72182.071203] [10341] 1000 10341 365 16 4 0 0 0 sh Apr 21 15:45:01 pi2 kernel: [72182.071212] Out of memory: Kill process 1947 (unison) score 70 or sacrifice child Apr 21 15:45:01 pi2 kernel: [72182.078994] Killed process 1947 (unison) total-vm:145180kB, anon-rss:139988kB, file-rss:776kB Apr 21 15:45:02 pi2 systemd[1]: Stopping User Manager for UID 1000... Apr 21 15:45:02 pi2 systemd[1716]: Stopped target Default. Apr 21 15:45:02 pi2 systemd[1716]: Reached target Shutdown. Apr 21 15:45:02 pi2 systemd[1716]: Stopped target Basic System. Apr 21 15:45:02 pi2 systemd[1716]: Stopped target Paths. Apr 21 15:45:02 pi2 systemd[1716]: Stopped target Sockets. Apr 21 15:45:02 pi2 systemd[1716]: Stopped target Timers. Apr 21 15:45:02 pi2 systemd[1716]: Starting Exit the Session... Apr 21 15:45:02 pi2 systemd[1716]: Received SIGRTMIN+24 from PID 10345 (kill). Apr 21 15:45:02 pi2 systemd[1]: Stopped User Manager for UID 1000. Apr 21 15:45:02 pi2 systemd[1]: Removed slice User Slice of kim.

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itpol/linux-workstation-security.md at master · lfit/itpol
by Andrew McGlashan 17 Apr '17

17 Apr '17

Hi All, An interesting resource, there are other policies and if you go up the chain, there are other github projects too. This is from Linux Foundation (fwiw), enjoy! - lfit "Linux Foundation IT" https://github.com/lfit/itpol/blob/master/linux-workstation-security.md -- Kind Regards AndrewM Andrew McGlashan IT Support & Broadband Solutions

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