how to find the diff of two sorted files (compare line by lilne)

file 1:

a
b
c
d
e
.
.
z

file2:

d
g
开发者_Python百科k

how do I find the data exists in 1 but not 2.

There is a utility that already does that:

comm -23 file1 file2

use unix comm

The POSIX standard comm utility also does this.

Use a program that does exactly that. i'm using kdiff3. for windows i think there is winmerge