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There are different ways to exclude and grep given a text file or input stream. I generally prefer the most basic one where use two grep where the first one is for exclude with -v option and pipe to second one where I grep for my string.   grep -v 'able' config.txt | grep 'system'  For more information look https://www.yjastar.com/ku/introduction-to-linux-grep-command-with-examples/

Well. You can use triple quotes in order to define multi line string like sss='''This is a string'''   For more information look https ://www.we_removed_the_spam_link.con/spam.exe

MOD: Removed the link. Because spam is bad, mmmkay?