Grep related: checking for This AND That

topcat · 03-31-2005, 08:37 AM

How can I use grep or any other command to check for String A AND String B in a given block of text that will be passed to grep (or other) using the |

Basically we would be reading a file and would like to check if a certain string A is NOT present in that file AND a certain string B is NOT present in that file.

IF both A & B are NOT present then do some action...

I can do it for 1 string, but not A & B together in 1 line.

dustu76 · 03-31-2005, 09:01 AM

Code:

infile=inf.txt
string1=one
string2=two

if [ -z "`grep $string1 $infile``grep $string2 $infile`" ] ; then
        echo "Do the thing"
fi

I have a feeling that there is a more elegant solution...

HTH.

Hko · 03-31-2005, 09:11 AM

If you want to do something if both A and B are not on the same line:

Code:

grep 'A' file.txt | grep -q 'B' || echo "Do something"

If you want to do something if both A and B are not present in the entire file:

Code:

FILE="file.txt" ; grep -q 'bbbb' $FILE || grep -q 'aaaa' $FILE || echo "Do something"

topcat · 04-01-2005, 03:41 AM

thank you very much.
!!