Comparing two files in Unix

You got 2 files which contains a list of servernames (as shown below). You want to compare the entries between two files and get the list of server names which aren’t present in both files:

1st file:

server_a

server_b

server_c

server_d

server_e

2nd file:

server_c

server_d

server_g

server_a

Output should be:

server_b

server_g

server_e

Solution 1:  
# sort file1 file2 | uniq –u

Solution 2:

# sort file1 > file1.sorted

# sort file2 > file2.sorted

# comm -3 file1.sorted file2.sorted