How Can I Compare And Merge Bed Files

I have three bed files with chrNo, start, end position and type. I need to compare each chrNo, start and end position of one file with 2 other files and write the common one in a new file. Can any one suggest how can I do this efficiently? I wrote the simple perl script, but as the file is huge, it is taking a lot of time, thus is not feasible. Thanks in advance

Example files:

file1.bed:

1 20 30

1 100 120

1 200 300

file2.bed:

1 2 5

1 25 34

1 200 300

file3.bed:

1 30 33

1 200 300

1 500 600

common.bed

1 30 34 --> coordinates with overlapping 5bp is considered as same but outermost coordinates of the 3 is taken in common file

1 200 300