grep with logic operators

There are lot of ways to use grep with logical operators.

1. Use \| to separate multiple patterns for the OR condition.

   Example: grep 'pattern1\|pattern2' filename

2. Use the -E option to send multiple patterns for the OR condition.

   Example: grep -E 'pattern1|pattern2' filename

3. Using a single -e matches only one pattern, but using multiple -e option matches more than one pattern.

   Example: grep -e pattern1 -e pattern2 filename

4. grep -v can simulate the NOT operation.

5. There is no AND operator in grep, but you can brute-force simulate AND by using the -E option.

   Example : grep -E 'pattern1.*pattern2|pattern2.*pattern1' filename

   The above example will match all the lines that contain both pattern1 and pattern2 in either order.)

With awk, as with perl, you'll have to wrap terms in //, but it can be done:

awk '(/term1/ && /term2/) || (/term1/ && xor(/term3/, /term4/))' 

You could use perl:

perl -wne 'print if (/term1/ && /term2/) || (/term1/ && (/term3/ xor /term4/))'

Where the switches are as follows:

-w turns on warnings
-n runs perl against each line of input (looping)
-e executes perl passed in the command line