How to delete from a text file, all lines that contain a specific string?

Question

How would I use sed to delete all lines in a text file that contain a specific string?

Answer 1

SED:

• '/James\|John/d'
• -n '/James\|John/!p'

AWK:

• '!/James|John/'
• /James|John/ {next;} {print}

GREP:

• -v 'James\|John'