[Nitro] question for unix wizzards

[Reid Thompson]

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.
> 
> -- 
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