compare two files and get the output for the same lines

Question

How can I get the following output using linux command by comparing two text files? Thanks.

file1:

    site110
    site120

file2(Updated):

    domain1.com - site110
    domain2.com - site111
    domain3.com - site112
    domain4.com - site113
    domain5.com - site120
    domain6.com - site1201
    domain7.com - site1202

output:

    domain1.com - site110
    domain5.com - site120

If I use:

    grep -f file1 file2

the output will be:

    domain1.com - site110
    domain5.com - site120
    domain6.com - site1201
    domain7.com - site1202

which the last two lines are not what I want. Thanks.

Answer 1

How about diff?

Answer 2

From the grep manpage:

   -f FILE, --file=FILE
          Obtain  patterns  from  FILE,  one  per  line.   The  empty file
          contains zero patterns, and therefore matches nothing.   (-f  is
          specified by POSIX.)

Therefore:

grep -f file1 file2

domain1.com - site110
domain5.com - site120

Answer 3

May be man paste ? Some output processing can be needed.