blog/Recording_video_from_cron_using_VLC.html

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   6     <title>Petter Reinholdtsen: Recording video from cron using VLC</title>
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  14  <h1>
  15      <a href="https://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
  16
  17  </h1>
  18
  19 </div>
  20
  21
  22     <div class="entry">
  23       <div class="title">Recording video from cron using VLC</div>
  24       <div class="date"> 5th April 2009</div>
  25       <div class="body"><p>One think I have wanted to figure out for a along time is how to
  26 run vlc from cron to do recording of video streams on the net.  The
  27 task is trivial with mplayer, but I do not really trust the security
  28 of mplayer (it crashes too often on strange input), and thus prefer
  29 vlc.  I finally found a way to do it today.  I spent an hour or so
  30 searching the web for recipes and reading the documentation.  The
  31 hardest part was to get rid of the GUI window, but after finding the
  32 dummy interface, the command line finally presented itself:</p>
  33
  34 <blockquote><pre>URL=http://www.ping.uio.no/video/rms-oslo_2009.ogg
  35 SAVEFILE=rms.ogg
  36 DISPLAY= vlc -q $URL \
  37   --sout="#duplicate{dst=std{access=file,url='$SAVEFILE'},dst=nodisplay}" \
  38   --intf=dummy</pre></blockquote>
  39
  40 <p>The command stream the URL and store it in the SAVEFILE by
  41 duplicating the output stream to "nodisplay" and the file, using the
  42 dummy interface.  The dummy interface and the nodisplay output make
  43 sure no X interface is needed.</p>
  44
  45 <p>The cron job then need to start this job with the appropriate URL
  46 and file name to save, sleep for the duration wanted, and then kill
  47 the vlc process with SIGTERM.  Here is a complete script
  48 <tt>vlc-record</tt> to use from <tt>at</tt> or <tt>cron</tt>:</p>
  49
  50 <blockquote><pre>#!/bin/sh
  51 set -e
  52 URL="$1"
  53 SAVEFILE="$2"
  54 DURATION="$3"
  55 DISPLAY= vlc -q "$URL" \
  56   --sout="#duplicate{dst=std{access=file,url='$SAVEFILE'},dst=nodisplay}" \
  57   --intf=dummy < /dev/null > /dev/null 2>&1 &
  58 pid=$!
  59 sleep $DURATION
  60 kill $pid
  61 wait $pid</pre></blockquote>
  62 </div>
  63
  64       <div class="tags">Tags: <a href="https://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="https://people.skolelinux.org/pere/blog/tags/nuug">nuug</a>, <a href="https://people.skolelinux.org/pere/blog/tags/video">video</a>.</div>
  65
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  67     </div>
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  76 <h2>Archive</h2>
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 137
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 139
 140 <li>2020
 141 <ul>
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 152
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 158
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 160
 161 </ul></li>
 162
 163 <li>2019
 164 <ul>
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 167
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 179
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 181
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 183
 184 <li><a href="https://people.skolelinux.org/pere/blog/archive/2019/12/">December (4)</a></li>
 185
 186 </ul></li>
 187
 188 <li>2018
 189 <ul>
 190
 191 <li><a href="https://people.skolelinux.org/pere/blog/archive/2018/01/">January (1)</a></li>
 192
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 194
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 196
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 198
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 200
 201 <li><a href="https://people.skolelinux.org/pere/blog/archive/2018/07/">July (5)</a></li>
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 203 <li><a href="https://people.skolelinux.org/pere/blog/archive/2018/08/">August (3)</a></li>
 204
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 207 <li><a href="https://people.skolelinux.org/pere/blog/archive/2018/10/">October (5)</a></li>
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 209 <li><a href="https://people.skolelinux.org/pere/blog/archive/2018/11/">November (2)</a></li>
 210
 211 <li><a href="https://people.skolelinux.org/pere/blog/archive/2018/12/">December (4)</a></li>
 212
 213 </ul></li>
 214
 215 <li>2017
 216 <ul>
 217
 218 <li><a href="https://people.skolelinux.org/pere/blog/archive/2017/01/">January (4)</a></li>
 219
 220 <li><a href="https://people.skolelinux.org/pere/blog/archive/2017/02/">February (3)</a></li>
 221
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 225
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 227
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 237
 238 <li><a href="https://people.skolelinux.org/pere/blog/archive/2017/12/">December (4)</a></li>
 239
 240 </ul></li>
 241
 242 <li>2016
 243 <ul>
 244
 245 <li><a href="https://people.skolelinux.org/pere/blog/archive/2016/01/">January (3)</a></li>
 246
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 252
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 256
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 259 <li><a href="https://people.skolelinux.org/pere/blog/archive/2016/08/">August (5)</a></li>
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 265 <li><a href="https://people.skolelinux.org/pere/blog/archive/2016/11/">November (8)</a></li>
 266
 267 <li><a href="https://people.skolelinux.org/pere/blog/archive/2016/12/">December (5)</a></li>
 268
 269 </ul></li>
 270
 271 <li>2015
 272 <ul>
 273
 274 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/01/">January (7)</a></li>
 275
 276 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/02/">February (6)</a></li>
 277
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 287
 288 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/08/">August (2)</a></li>
 289
 290 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/09/">September (2)</a></li>
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 292 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/10/">October (9)</a></li>
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 294 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/11/">November (6)</a></li>
 295
 296 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/12/">December (3)</a></li>
 297
 298 </ul></li>
 299
 300 <li>2014
 301 <ul>
 302
 303 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/01/">January (2)</a></li>
 304
 305 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/02/">February (3)</a></li>
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 307 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/03/">March (8)</a></li>
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 311 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/05/">May (1)</a></li>
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 313 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/06/">June (2)</a></li>
 314
 315 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/07/">July (2)</a></li>
 316
 317 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/08/">August (2)</a></li>
 318
 319 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/09/">September (5)</a></li>
 320
 321 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/10/">October (6)</a></li>
 322
 323 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/11/">November (3)</a></li>
 324
 325 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/12/">December (5)</a></li>
 326
 327 </ul></li>
 328
 329 <li>2013
 330 <ul>
 331
 332 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
 333
 334 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/02/">February (9)</a></li>
 335
 336 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/03/">March (9)</a></li>
 337
 338 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/04/">April (6)</a></li>
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 340 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/05/">May (9)</a></li>
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 342 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/06/">June (10)</a></li>
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 344 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/07/">July (7)</a></li>
 345
 346 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/08/">August (3)</a></li>
 347
 348 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/09/">September (5)</a></li>
 349
 350 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/10/">October (7)</a></li>
 351
 352 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/11/">November (9)</a></li>
 353
 354 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/12/">December (3)</a></li>
 355
 356 </ul></li>
 357
 358 <li>2012
 359 <ul>
 360
 361 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 362
 363 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
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 365 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
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 367 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/04/">April (12)</a></li>
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 369 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/05/">May (12)</a></li>
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 371 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/06/">June (20)</a></li>
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 373 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/07/">July (17)</a></li>
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 375 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/08/">August (6)</a></li>
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 377 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/09/">September (9)</a></li>
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 379 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/10/">October (17)</a></li>
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 381 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/11/">November (10)</a></li>
 382
 383 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/12/">December (7)</a></li>
 384
 385 </ul></li>
 386
 387 <li>2011
 388 <ul>
 389
 390 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 391
 392 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
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 394 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
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 411
 412 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 413
 414 </ul></li>
 415
 416 <li>2010
 417 <ul>
 418
 419 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 420
 421 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
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 423 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
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 429 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
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 431 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
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 433 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
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 437 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
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 440
 441 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 442
 443 </ul></li>
 444
 445 <li>2009
 446 <ul>
 447
 448 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 449
 450 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
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 452 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
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 454 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
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 456 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
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 460 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
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 462 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 463
 464 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
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 466 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
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 468 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 469
 470 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 471
 472 </ul></li>
 473
 474 <li>2008
 475 <ul>
 476
 477 <li><a href="https://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 478
 479 <li><a href="https://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 480
 481 </ul></li>
 482
 483 </ul>
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 485
 486
 487 <h2>Tags</h2>
 488 <ul>
 489
 490  <li><a href="https://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (19)</a></li>
 491
 492  <li><a href="https://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 493
 494  <li><a href="https://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
 495
 496  <li><a href="https://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
 497
 498  <li><a href="https://people.skolelinux.org/pere/blog/tags/betalkontant">betalkontant (9)</a></li>
 499
 500  <li><a href="https://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (12)</a></li>
 501
 502  <li><a href="https://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (17)</a></li>
 503
 504  <li><a href="https://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
 505
 506  <li><a href="https://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (2)</a></li>
 507
 508  <li><a href="https://people.skolelinux.org/pere/blog/tags/debian">debian (194)</a></li>
 509
 510  <li><a href="https://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (159)</a></li>
 511
 512  <li><a href="https://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook (9)</a></li>
 513
 514  <li><a href="https://people.skolelinux.org/pere/blog/tags/digistan">digistan (11)</a></li>
 515
 516  <li><a href="https://people.skolelinux.org/pere/blog/tags/dld">dld (18)</a></li>
 517
 518  <li><a href="https://people.skolelinux.org/pere/blog/tags/docbook">docbook (30)</a></li>
 519
 520  <li><a href="https://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
 521
 522  <li><a href="https://people.skolelinux.org/pere/blog/tags/english">english (451)</a></li>
 523
 524  <li><a href="https://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (23)</a></li>
 525
 526  <li><a href="https://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (14)</a></li>
 527
 528  <li><a href="https://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (34)</a></li>
 529
 530  <li><a href="https://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (9)</a></li>
 531
 532  <li><a href="https://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (20)</a></li>
 533
 534  <li><a href="https://people.skolelinux.org/pere/blog/tags/h264">h264 (20)</a></li>
 535
 536  <li><a href="https://people.skolelinux.org/pere/blog/tags/intervju">intervju (43)</a></li>
 537
 538  <li><a href="https://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (16)</a></li>
 539
 540  <li><a href="https://people.skolelinux.org/pere/blog/tags/kart">kart (23)</a></li>
 541
 542  <li><a href="https://people.skolelinux.org/pere/blog/tags/kodi">kodi (6)</a></li>
 543
 544  <li><a href="https://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
 545
 546  <li><a href="https://people.skolelinux.org/pere/blog/tags/lego">lego (5)</a></li>
 547
 548  <li><a href="https://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
 549
 550  <li><a href="https://people.skolelinux.org/pere/blog/tags/linuxcnc">linuxcnc (5)</a></li>
 551
 552  <li><a href="https://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
 553
 554  <li><a href="https://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
 555
 556  <li><a href="https://people.skolelinux.org/pere/blog/tags/madewithcc">madewithcc (3)</a></li>
 557
 558  <li><a href="https://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
 559
 560  <li><a href="https://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (46)</a></li>
 561
 562  <li><a href="https://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (15)</a></li>
 563
 564  <li><a href="https://people.skolelinux.org/pere/blog/tags/noark5">noark5 (23)</a></li>
 565
 566  <li><a href="https://people.skolelinux.org/pere/blog/tags/norsk">norsk (320)</a></li>
 567
 568  <li><a href="https://people.skolelinux.org/pere/blog/tags/nuug">nuug (198)</a></li>
 569
 570  <li><a href="https://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (40)</a></li>
 571
 572  <li><a href="https://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 573
 574  <li><a href="https://people.skolelinux.org/pere/blog/tags/opensnitch">opensnitch (4)</a></li>
 575
 576  <li><a href="https://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (75)</a></li>
 577
 578  <li><a href="https://people.skolelinux.org/pere/blog/tags/personvern">personvern (114)</a></li>
 579
 580  <li><a href="https://people.skolelinux.org/pere/blog/tags/raid">raid (2)</a></li>
 581
 582  <li><a href="https://people.skolelinux.org/pere/blog/tags/reactos">reactos (1)</a></li>
 583
 584  <li><a href="https://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 585
 586  <li><a href="https://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
 587
 588  <li><a href="https://people.skolelinux.org/pere/blog/tags/robot">robot (17)</a></li>
 589
 590  <li><a href="https://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 591
 592  <li><a href="https://people.skolelinux.org/pere/blog/tags/ruter">ruter (7)</a></li>
 593
 594  <li><a href="https://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 595
 596  <li><a href="https://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (59)</a></li>
 597
 598  <li><a href="https://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 599
 600  <li><a href="https://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
 601
 602  <li><a href="https://people.skolelinux.org/pere/blog/tags/standard">standard (74)</a></li>
 603
 604  <li><a href="https://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (7)</a></li>
 605
 606  <li><a href="https://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (14)</a></li>
 607
 608  <li><a href="https://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (64)</a></li>
 609
 610  <li><a href="https://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (5)</a></li>
 611
 612  <li><a href="https://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
 613
 614  <li><a href="https://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
 615
 616  <li><a href="https://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (20)</a></li>
 617
 618  <li><a href="https://people.skolelinux.org/pere/blog/tags/video">video (79)</a></li>
 619
 620  <li><a href="https://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 621
 622  <li><a href="https://people.skolelinux.org/pere/blog/tags/web">web (42)</a></li>
 623
 624 </ul>
 625
 626
 627     </div>
 628     <p style="text-align: right">
 629  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 630 </p>
 631
 632   </body>
 633 </html>