[SOLVED] How can I use grep in Linux to find lines with multiple matching conditions in a text file?

Issue

I'm working on a Linux system and need assistance in finding specific lines within a large text file using the grep command.

The criteria for these lines are:

• Inclusion of either 'term1' or 'term2'.
• Exclusion of 'term3'.
• Ending with 'term4' or 'term5'.

I've been trying different grep variations but can't seem to fulfill all conditions at once. Could someone help me construct the appropriate grep command? Your assistance is much appreciated!

Solution

You can use pcre of grep with lookahead assertions :

grep -P '^(?=.*term[12])(?!.*term3).*term[45]$' <<< 'term2 term1 term5'

Answered By - Philippe

Answer Checked By - Mildred Charles (WPSolving Admin)