Re: Slightly OT: How to grep for two different things in a file

Aryeh Friedman <aryeh.friedman@gmail.com> writes:

> I have 2 patterns I need to find in a given set of files.  A file only
> matches if it contains *BOTH* patterns but not in any given
> relationship as to where they are in the file.   In the past I have
> used piped greps when both patterns are on the same line but in my
> current case they are almost certainly not on the same line.
>
> For example my two patterns are "tid" (String variable name) and
> "/tmp" [String literal] (i.e. the full string is the concatenation of
> the two patterns I would do:
>
> grep -Ri tid src/java|grep -i /tmp
>
> But since /tmp is in a symbolic constant defined elsewhere (in a
> different Java file) I need to find programmatically either the name
> of the constant (has different names in different classes) and then do
> the piped grep above with it or I need to look for the two patterns
> separately and say a file is only accepted if it has both.
>
> P.S. The reason for this is I am attempting to audit my code base to
> see what classes leave behind orphaned temp files.

I use grep -l to just return a list of files that contain one pattern,
and then grep -l for the second pattern on that list.  That can be done
in one line for your example as follows:

  grep -li /tmp `grep -liR tid src/java`

I hope that gives you some ideas.
-- 
Carl Johnson		carlj@peak.org