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What output are you expecting and what are you getting? I get the following with what you posted. Is it not what you wanted/intended? 
Machines extra in second list

newly in this nt64osbld2

already there nt64osbld2tmp

newly in this nt64osbld3

newly in this nt64oscitrix1

newly in this ntosbld4

newly in this ntosbld5

newly in this ntosbld6

already there vm-nt64osbld2

already there vm-nt64osbld3

already there vm-nt64osbld4

already there vm-nt64osbld5

already there vm-nt64osremot1

already there vm-nt64osremot2

already there vm-nt64osremot3

already there vm-nt64osremot4

already there vm-nt64osremot5

already there vm-nt64osremot6

already there vm-nt64osremot7

already there vm-nt64osremot8

already there vm-ntosbld1

already there vm-ntosbld5

already there vm-ntoscert3

already there vm-ntosdev1

already there vm-os2k8r264-01

already there vm-osremote1

already there vm-osremote10

already there vm-osremote2

already there vm-osremote3

already there vm-osremote4

already there vm-osremote5

already there vm-osremote6

already there vm-osw2k8-1

already there vm-osw2k8-2

newly in this vm-osw2k8x64-1

newly in this vm-osw2k8x64-2

already there vm-oswin2k3-32

already there vm-oswin2k3-64

[download]

EDIT: After incorporating tobyink's or ColonelPanic's suggestion, I get the same results, but it is now safe against regex metacharacters

In reply to Re: How to grep exact string by frozenwithjoy
in thread How to grep exact string by Divakar

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