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  • Oh, because I wanted to do MD5 comparison. Let me format my question clearer. :) Commented Nov 17, 2014 at 2:58
  • Thanks Terdon, you're right. It works perfectly after I removed all the 'ls' Commented Nov 17, 2014 at 3:27
  • 2
    While I agree that the correct way is to just give the file's name as an argument, the reason the other way is wrong is incorrect. When you type ls file | md5sum, you are taking the md5sum of the filename as opposed to the file. The filename has no effect on the result of md5sum when entered as you indicated or via an alternate method cat filename | md5sum Commented Nov 17, 2014 at 3:37
  • Thank you R Schultz & Terdon! The correct comparison worked using cat filename | md5sum -c md5.tmp instead of 'ls' Commented Nov 17, 2014 at 4:11
  • @R Schultz , while using the command cat filename| md5sum -c /tmp/Config/md5.tmp does work on the command line, but it does not work in the script. Can you help? Thank you! It returned me a result like this: - hostname1-config.uac: FAILED open or read Commented Nov 17, 2014 at 4:25