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grep first occurence of a string and print the line number

dplinnane
dplinnane asked
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Last Modified: 2013-12-18
How do I grep first occurence of a string and print the line number

grep 'Not Connected' crdb2.log| head -1    
this will print SP2-0640: Not connected   but I want it to print the line number. The file is 10000000 long so I dont want to manually look through it.

thanks in advance
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