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sumeet inani 06-14-2011 11:20 PM
quickest file content verification
 
I have read that md5sum for 2 different files can never be same so it is accurate but time consuming.
Code:
$time cksum /data/sumeet/iso/WINXPSP3.iso
1295489342 704163840 /data/sumeet/iso/WINXPSP3.iso

real        0m7.242s
user        0m1.712s
sys        0m0.304s
$time md5sum /data/sumeet/iso/WINXPSP3.iso
0cd0c28b54a7904b36617274acc73160  /data/sumeet/iso/WINXPSP3.iso

real        0m1.676s
user        0m1.392s
sys        0m0.260s
$time cksum /data/sumeet/iso/WINXPSP3.iso
1295489342 704163840 /data/sumeet/iso/WINXPSP3.iso

real        0m1.892s
user        0m1.656s
sys        0m0.228s
I think disparity between time taken by cksum for same file may be due to caching.


Anyway , my question is which is fastest file content verification (forget byte count ) ?

sumeet inani 06-14-2011 11:33 PM
I will read http://www.itworld.com/nlsnunixchecksum061116 .


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