Compare two files and get only the differences - shell script

Question

I have two files. The first one has a lot of ID and the second one has some ID too. I want to know which ID of the second file doesn't exist in the first one.

I've used this command:

diff -u total.log second.log | grep -E "^\+"

But I'm not really sure if it's the best way to do that.

Total.log

Second.log

Can anybody help me?

Thanks :)

hek2mgl · Accepted Answer

grep can read patterns from a file using the option -f:

grep -vFf total.log second.log

-F tells grep that patterns aren't regex patterns - they are fixed length pattern. -v negates the match.

Compare two files and get only the differences - shell script

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