How do I output lines that do not match 'this_string' using Get-Content and Select-String in PowerShell?

Question

I found a post about users that wanted to use grep in PowerShell. For example,

PS> Get-Content file_to_grep | Select-String \"the_thing_to_grep_for\"
<         


        

Answer 1

get-content file_to_grep | select-string "^(?!the_thing_to_grep_for$)"

will return the lines that are different from the_thing_to_grep_for.

get-content file_to_grep | select-string "^(?!.*the_thing_to_grep_for)"

will return the lines that don't contain the_thing_to_grep_for.