Very Computer

1. Help with "grep" command

Greetings all,

Is there a command allowing to find a string in a file BUT STOPS AT
the first occurence of this string ?

To be more specific, here is my trouble : I am generating some big files
in which I would like to extract the line number (corresponding to a
given string). I use for this :

                            nl file | grep "string"

However, this string appears only once. This is why I would like
a command which does not perform the searching farther than the first
occurence.

I hope I was clear enough....

Thanks all.

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