[Nitro] question for unix wizzards

Reid Thompson Reid.Thompson at ateb.com
Mon Feb 4 11:49:55 EST 2008


On Mon, 2008-02-04 at 18:09 +0200, George Moschovitis wrote:
> Dear devs,
> 
> 2 small unix related questions.
> 
> does anyone know about:
> 
> - a quick and easy way to remove duplicate lines from a text files?
from http://www.student.northpark.edu/pemente/sed/sed1line.txt

# delete duplicate, nonconsecutive lines from a file. Beware not to
# overflow the buffer size of the hold space, or else use GNU sed.
sed -n 'G; s/\n/&&/; /^\([ -~]*\n\).*\n\1/d; s/\n//; h; P'

> - a quick and easy way to decide if two image (binary) files are the
> same image/picture?
diff will tell you if the files are different also

rthompso at raker ~ $ diff 10000_Galaxies,_HST_Ultra_Deep.png Deathvalleysky_nps_big.png
Files 10000_Galaxies,_HST_Ultra_Deep.png and Deathvalleysky_nps_big.png differ
rthompso at raker ~ $ cp 10000_Galaxies,_HST_Ultra_Deep.png junk.png
rthompso at raker ~ $ diff 10000_Galaxies,_HST_Ultra_Deep.png junk.png


> 
> thanks in advance for your help!
> 
> -g.
> 
> -- 
> http://gmosx.me.gr
> http://joy.gr
> http://cull.gr
> http://nitroproject.org
> http://phidz.com
> http://joyerz.com 
> _______________________________________________
> Nitro-general mailing list
> Nitro-general at rubyforge.org
> http://rubyforge.org/mailman/listinfo/nitro-general


More information about the Nitro-general mailing list