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Wow!! thanks for the detailed response and I got the concept now..... that too in a short time.....

Yes you are right the path name is /dev/null .. Its my typo...

Also the advise of using -q...

I have the following command using Grep in a complex shell script. Can you please advise what does the below expression mean?
# grep ^${File1}\| $Textfile > /deve/null 2>&1

Questions,

1)...