Exclude lines ending with a specific word when redirecting output of shell command to a file

Question

I intend to run a shell command that outputs hundreds of lines that end with the word 'OK'. I want to store this output to a file and do not want all those lines that end with the 'OK'. How would I do this? Something like command > output.txt --exclude_lines=*.OK is what I was looking for.

Answer 1

Assuming that the word OK is supposed to be at the end of the line, you could do it by

your_command | grep -vw 'OK$' >output.txt

The $ ensures that an OK inside the line is ignored, and the -w ensures that a line ending in i.e. NOK is not missed.