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

On Wed, 7 Sep 2022, Aryeh Friedman wrote:

> 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.
>
> -- 
> Aryeh M. Friedman, Lead Developer, http://www.PetiteCloud.org

Apologies if someone that whis and I missed it.

egrep "pattern1|pattern2|..." files

If the patterns contain $|"' etc it get trickier but this works for 90% of 
what I what to do from day-to-day