Is it possible to search in Unix for files which contain both of two search patterns?

Spartacus

You can use a regular expression in grep:

grep -E "word1|word2" file

The '-E' indicates that you are providing an extended regular expression as search term. The '|' represents 'or'.

Take care that you use the right grep. Especialy on SUN the default is mostly not correct, use /usr/xpg4/bin/grep instead

Hope this helps,
Dick

But the output of this contains also files which contains only one of both patterens (sory I think I didn't ask clear enaugh!!).

But I need only Files in which both patterns exist!

Spartaus

(Somtimes it's more difficult to ask the questions, than to give the answer!)

then try

grep word1 file | grep word2

Can you give a little more explanation:

For what stands "file" ?


Spartacus

ok,

There is two ways of doing this,

grep Artikel * | grep E543

This will show all files in the current directory with Artikel and E543 on the same line.

If you need both patterns to appear anywhere in the file you have to do this

for x in `grep -l Artikel *`
do
grep -l E543 $x
done

grep -l (lower case L) will return only the file name.

Hope this helps

Great!!!! that is exact, what I'm looking for!!!

Thanks !!!

Spartacus

Depening on your needs, you might try:

grep -E "pattern1|pattern2" * | awk -F: '{print $1}' | sort | uniq

One line does it all. One great thing about UNIX is that it will get your answer in so many different ways! :cool: The '-F' passed to awk identifies the field separator (which in this case is the colon). On my HPUX box I had to use 'egrep', so alter accordingly. My linux box works with 'grep -E'. YMMV.

Hm, I'm a bit confused that everybody agrees about that. As fas as I know, the normal grep does not (autmoatically) use regular expressions.

Example: create a file "f" containing lines of 11, 12, 13, 21, 22, 23, 31, 32, 33.

Tests:
1) grep "1|2" f => NOTHING!
2) grep -E "1|2" => all but 33
3) egrep "1|2" => all but 33

Thats the funny part of the "standard" unix commands. The usage of grep and egrep can be different per platform so try

$ man grep

to find out exactly what it is doing for you.

Kind regards,
Dick

Always use the '-e' switch for regexp's.