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

P.S. I know that's not what you want here but to search for 2 strings in
the same line there's also a trick with egrep

egrep 'string1.*string2|string2.*string1'


Again you can also use egrep -E


And in this particular case I kinda always go with two piped greps


On Thu, Sep 8, 2022, 00:06 Miguel C <miguelmclara@gmail.com> wrote:

> Maybe I didn't understand the complexity here but doesn't grep -E or egrep
> work here ?
>
> egrep "string1|string2" ?
>
> Also works with -r and you can use it inside exec in find too... but if
> you want to search for more that one string AFAIK this is the easiest way.
>
>
>
> On Wed, Sep 7, 2022, 23:56 Andreas Kusalananda Kähäri <
> andreas.kahari@abc.se> wrote:
>
>> On Wed, Sep 07, 2022 at 06:00:36PM -0400, 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
>>
>> I don't see an example of the stuff you talk about after "But since
>> /tmp is in a symbolic constant defined elsewhere..." so I don't fully
>> understand what that would involve and will therefore ignore it.
>> Instead, the following answers the subject question, "How to grep for
>> two different things in a file".
>>
>>         find src/java -type f \
>>                 -exec grep -qF 'tid' {} \; \
>>                 -exec grep -qF '/tmp' {} \; \
>>                 -print
>>
>> or call an in-line script,
>>
>>         find src/java -type f -exec sh -c '
>>                 for pathname do
>>                         if grep -qF "tid" "$pathname" &&
>>                            grep -qF "/tmp" "$pathaname"
>>                         then
>>                                 printf "%s has both tid and /tmp\n"
>> "$pathname"
>>                         fi
>>                 done' sh {} +
>>
>> In any case, the point is to first test a file for one of th strings,
>> and if that succeeds, test the same file for the other string, then
>> report the file as accepted if that other string was also found.
>>
>> See grep(1) for what -F and -q does.  I dropped the -i option as I
>> assumed that you actully know the case, at least when looking for
>> "/tmp".
>>
>> Also, https://unix.stackexchange.com/questions/389705
>>
>>
>> --
>> Andreas (Kusalananda) Kähäri
>> SciLifeLab, NBIS, ICM
>> Uppsala University, Sweden
>>
>> .
>>
>>