UNIX kommandolinjeverktøy for bearbeiding av filer

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1 UNIX kommandolinjeverktøy for bearbeiding av filer Kjell Are Refsvik Februar 2012 imt3531 Digitale medieproduksjonssystemer CC:BY-NC-SA

2 93 20 WHERE WE ARE NOW UKE TEMA UKE TEMA 1 Ingen forelesninger 2 Introduksjon - metoder, midler, oppgaver og evaluering 3 Podcasting: introduksjon og teknikk 4 Bedriftsbesøk hos NRK Oppland og Hedmark 5 Bildesystemer 6 Videosystemer (utsatt til utstyret kommer) 7 Lydsystemer 8 Planleggingssystemer 9 UNIX-verktøy for bearbeiding av filer og strømmer 10 Gruppevise podcastsendinger A+B 11 Gruppevise podcastsendinger C+D 12 Gruppevise podcastsendinger E+A 13 Gruppevise podcastsendinger B+C 14 Påske 15 Gruppevise podcastsendinger D+E 16 Gruppevise podcastsendinger A+B 17 Gruppevise podcastsendinger C+D 18 Gruppevise podcastsendinger E+A 19 Gruppevise podcastsendinger B+C 20 Gruppevise podcastsendinger D+E Eksamen. 7. Juni. Skriftelig

3 94 TODAY S GOAL After this lecture and its activities, you should be able to: Vite hvordan dere skal installere ressurser under Mac OS X for å kunnen installere kommandolinjeverktøy Installere kommandolinjeverktøy Bruke enkle kommandolinjeverktøy for å bearbeide filer

4 95 HVA ER UNIX OG KOMMANDOLINJEVERKTØY? UNIX Kommandolinjeverktøy

5 96 EGENSKAPER VED UNIX KOMMANDOLINJEVERKTØY Open and free environment where you may formalise workflows Small simple programs that can communicate with eachother Lends itself well to large and/or repetitive tasks Avoids lock-ins between tools and data As soon as the workflow had been defined, often more effective (cpu/ power/time) Not intuitive Not artistic

6 97 KOMMANDOLINJEPROGRAMMER [gjørettellerannet] [pådennemåten] [påfølgendefiler] [gjørettellerannet] < [kildefil] [destinasjonsfiler] [gjørettellerannet] [pådennemåten] [gjørettellerannet] [pådennemåten] > [destinasjonsfil]

7 98 DIGITAL ARBEIDSFLYT Fange 1 2 Finne/gruppere Transformere Transkode Beskrive Pakke Transportere Publisere

8 99 WORKFLOW A workflow consists of a sequence of connected steps. It is a depiction of a sequence of operations, declared as work of a person, a group of persons,[1] an organization of staff, or one or more simple or complex mechanisms. Workflow may be seen as any abstraction of real work. For control purposes, workflow may be a view on real work under a chosen aspect,[2] thus serving as a virtual representation of actual work. The flow being described may refer to a document or product that is being transferred from one step to another. - Wikipedia, Aug. 2011

9 100 HVORDAN? Pakkehåndteringssystem Mac OS X: MacPorts...

10 101 APPLIKASJONER (INSTALLERT MACPRO PÅ A211) ExifTool Wget ffmpeg imagemagick

11 102 APPLIKASJONER (INSTALLERT MACPRO PÅ A211) ExifTool Wget ffmpeg imagemagick

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14 ExifTool Version Number : 7.93 File Name : IMG_0338.JPG Directory :. File Size : 2.2 MB File Modification Date/Time : 2010:08:31 14:52:56+02:00 File Type : JPEG MIME Type : image/jpeg Exif Byte Order : Big-endian (Motorola, MM) Image Description : Back Camera Make : Apple Camera Model Name : iphone Orientation : Horizontal (normal) X Resolution : 72 Y Resolution : 72 Resolution Unit : inches Software : Modify Date : 2010:08:31 14:52:56 Y Cb Cr Positioning : Centered Exposure Time : 1/1436 F Number : 2.4 Exposure GJØVIK UNIVERSITY Program COLLEGE : Program AE 105

15 ISO : 80 Exif Version : 0221 Date/Time Original : 2010:08:31 14:52:56 Create Date : 2010:08:31 14:52:56 Components Configuration : Y, Cb, Cr, - Shutter Speed Value : 1/1436 Aperture Value : 2.4 Metering Mode : Average Flash : Auto, Did not fire Focal Length : 3.9 mm Subject Area : Flashpix Version : 0100 Color Space : srgb Exif Image Width : 0 Exif Image Height : 0 Sensing Method : One-chip color area Exposure Mode : Auto White Balance : Auto Scene Capture Type : Standard Sharpness : Hard 106

16 GPS Latitude Ref : North GPS Longitude Ref : East GPS Time Stamp : 14:52:50.78 GPS Img Direction Ref : True North GPS Img Direction : Compression : JPEG (old-style) Thumbnail Offset : 884 Thumbnail Length : 9701 Image Width : 2592 Image Height : 1936 Encoding Process : Baseline DCT, Huffman coding Bits Per Sample : 8 Color Components : 3 Y Cb Cr Sub Sampling : YCbCr4:2:0 (2 2) Aperture : 2.4 GPS Latitude : 60 deg 47' 25.80" N GPS Longitude : 10 deg 41' 0.00" E GPS Position : 60 deg 47' 25.80" N, 10 deg 41' 0.00" E Image Size : 2592x1936 Shutter Speed : 1/

17 108 WGET used to get data from a web server Powerful program so use it with care Robust over unstable networks Similar programs out there are curl wget -A.JPG -r -l1 -np

18 109 FFPMEG program for å bearbeide lyd og video f.eks transkoding til annet format ffmpeg -i video.mp4 video.avi

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20 111 A PERSONAL EXAMPLE

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25 116 THE SCRIPT #!/bin/sh for f in *; do convert $f -sigmoidal-contrast 3x10% \ \( +clone -sparse-color Barycentric '0,0 black 0,%[fx:h-1] gray80' \ -solarize 50% -level 50%,0 \) \ -compose Blur -set option:compose:args 15 -composite \ model_$f done

26 117 TO WATCH Some of Keith Loutit s amazing videos with the tiltshift visual effect:

27 118 MORE THAN ONE COMMAND AT A TIME Create a Movies folder inside the home folder... mkdir ~/Movies ; cp *.mp4 ~/Movies... copy all MPEG-4 files to this same folder

28 119 OUTPUT OF ONE COMMAND AS INPUT TO ANOTHER USING PIPES List all text files in the current folder... pipe ls *.txt grep refsvik...and search for the word refsvik inside those files.

29 120 OUTPUT OF ONE COMMAND AS INPUT TO ANOTHER USING PIPES List all text files in the current folder......and output the result to a text file. ls *.txt grep refsvik > output.txt...and search for the word refsvik inside those files. redirect

30 121 SCRIPTS Small text files that can contain commands that you want to execute in a sequence #!/bin/sh for f in *.JPG; do base= basename $f.jpg mv $f$base.jpg done 1. Declare the shell you are making this for 2. Give it a descriptive name and use the extension.sh 3. Make it executable using the chmod command chmod 770 <scriptname.sh> 4. Run it by adding its folder to the path and type its name or go to its folder and write./<scriptname.sh>

31 122 #!/bin/sh for f in *.JPG; do base= basename $f.jpg mv $f$base.jpg done This particular script is a loop that goes through all the files in the current folder and renames all JPEG files to jpg.

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34 125 RESOURCES Eksamensrelevant stoff er:

35 126 CONTACT INFORMATION Name Telephone WWW Office Available Kjell Are Refsvik A-224AB -