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I don't think RudiC's suggestion is going to work since you want separate counts of the number of lines containing each of the three strings, not a total of number of lines that contain one or more...

How about [ $(grep -c "$CID" dhcp.conf) -gt 1 ] && echo duplicate || echo uniqueThis does not cover the case that CID is not found at all.

Please do so anyway. Using CODE-tags does two things: first, it switches to some fixed-width font, which helps in showing the structure of data (especially if they are fomatted in a table-like way)...

Please use code tags as required by forum rules!

---------- Post updated at 11:42 ---------- Previous update was at 11:35 ----------

Your specification still is extremely sparse. Try thisawk...