If I have a file A
containing a list of fields:
2017-04-23
2017-04-30
2017-05-07
2017-05-14
2017-05-21
2017-05-28
2017-06-04
2017-06-11
2017-06-18
2017-06-25
And another file B
containing a list of fields:
2017-04-23
2017-04-30
2017-05-07
2017-05-14
2017-05-21
2017-05-28
2017-06-04
2017-06-11
2017-06-18
2017-06-25
2017-07-02
2017-07-09
2017-07-16
2017-07-23
How can I quickly diff these two files where I want to know all fields in file B
which are not present in file A
?
This is not a regular diff where I want to see a relative difference between files but more like a hash comparison where each line is an entry in a map. I want to get a list of all lines in file B
which are not present in file A
so that I can remove them where each line in file A
represents a directory which is to be preserved.
I am looking for a Bash/CoreUtils solution.