Possible to merge three plink bim, bed and fam files?

1

Hi, I am using plink1.9 and trying to merge three plink binary files. They are all controls.

Test_1.bim
Test_1.bed
Test_1.fam

Test_2.bim
Test_2.bed
Test_2.fam

Test_3.bim
Test_3.bed
Test_3.fam

I am using
plink1.9 --noweb --bfile Test_1 --bmerge Test_2.bim Test_2.bed Test_2.fam Test_3.bim Test_3.bed Test_3.fam --make-bed --out All_controls

I get this error
Error: --bmerge accepts at most 3 parameters.

Because I am using 6 parameters. If I use 3 parameters, I may lose some information. Please assist


bmerge


Plink1.9

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