LinuxShort

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Revision as of 17:14, 29 March 2011 (view source) Ana (Talk | contribs) m (→Some cool stuff) ← Older edit		Revision as of 17:53, 29 March 2011 (view source) Ana (Talk | contribs) m (→Some cool stuff) Newer edit →
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	sudo aptitude install bisigi-themes		sudo aptitude install bisigi-themes
-	* Youtube .flv to .mp3	+	* Convert youtube .flv to .mp3 ([http://ubuntuforums.or /showthread.php?t=1117283 FORUM])
	sudo apt-get install youtube-dl		sudo apt-get install youtube-dl
	sudo youtube-dl -U		sudo youtube-dl -U

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Revision as of 17:53, 29 March 2011

Usefull short commands

• kill a process tree

When some script is started from a command line in a for-loop and a process tree is made, one should find the parent process and its PID and then simply kill it:

   $ pstree username -p 
   sshd(19953)---bash(19954)---bash(22238)---idl(22323)-+-{idl}(22326)
                                                        |-{idl}(22327)
                                                        |-{idl}(22328)
                                                        `-{idl}(22329) 
   sshd(20096)---bash(20097)
   sshd(20762)---bash(20763)
   sshd(21087)---bash(21088)-+-grep(21309)
                             `-top(21308)
   sshd(21736)---bash(21737)
   sshd(21780)---bash(21781)---pstree(22331)

Or if this tree is to long, one should grep the program (here:idl) with: $ pstree usrname -p | grep idl

   $ kill 19953  
   $ pstree username -p  
   sshd(20096)---bash(20097)
   sshd(20762)---bash(20763)
   sshd(21087)---bash(21088)-+-grep(21309)
                             `-top(21308)
   sshd(21736)---bash(21737)
   sshd(21780)---bash(21781)---pstree(22332)

• Change sth inside file

  sed -i s/'\-9999'/'NaN'/g filename 

This will change -9999 with NaN inside a file, without making some tmp file in between.

• Print rotated picture

  lp -o media=a4 -o orientation-requested=4 -o fitplot figure.ps

• Print in fixed width format with awk

 echo $a $b $c |  awk '{for (i=1; i<=NF; i++) printf("%-20s ",$i);printf ("\n")}' > outfile.dat

where strings a,b,c may be entire lines.

• Make a small size pdf out of several pdfs

 gs -sDEVICE=pdfwrite -q -dNOPAUSE -dBATCH -sOutputFile=MajorFile.pdf SmallFiles*.pdf 

Combined files can ba a mix of .pdf .ps and .eps files and output file can be a .ps also

• Cut a portion of a pdf file saving resolution and sharpness

 gs -g2700x3500 -sOUTPUTFILE=output.pdf -sDEVICE=pdfwrite -dBATCH -c "<< /PageOffset [-30 -120] >> setpagedevice" -f input.pdf

Where [-30 -120] means - shift the content of the old image to its left corner by (x,y)=(30,120) pixels (change the origin of the image) and 2700x3500 are the dimensions of the new image. Be careful - input.pdf should be a single page.

• Make a series of single-page EPS files made up of pages from various input files

 gs -sDEVICE=epswrite -q -dNOPAUSE -dBATCH -dSAFER -sOutputFile=p%08d.eps 5page-first.pdf 7page-second.ps 1page-third.eps 

The resulting files will be nicely named as p00000001.eps .... p00000013.eps

• Convert eps to jpg using native gs

 gs -sDEVICE=jpeg -q -dJPEGQ=100 -dNOPAUSE -dBATCH -dSAFER -r100 -sOutputFile=image.jpg image.eps # -r100 should be changed to -r50 for denser image 

• Resize image

 mogrify -trim -resize 70% image.jpg   # or -resize 800x600 for fixed width

Some cool stuff

• Very nice themes for Ubuntu 10.04

   sudo add-apt-repository ppa:bisigi
   sudo aptitude update
   sudo aptitude install bisigi-themes

• Convert youtube .flv to .mp3 (/showthread.php?t=1117283 FORUM)

  sudo apt-get install youtube-dl
  sudo youtube-dl -U
  sudo youtube-dl -U
  sudo apt-get install ffmpeg libavcodec-unstripped-52
  sudo apt-get install ubuntu-restricted-extras 
  # Example:
  youtube-dl http://www.youtube.com/watch?v=Md7IhGYKncs
  ffmpeg -i Md7IhGYKncs.flv -acodec libmp3lame -ab 128 indiana.mp3