multijoin

npm install -g multijoin

Using BSD (or UNIX) join command to merge multiple CSV files together based on their first column.

file1:

1,a
2,b
3,c

file2:

1,d
2,e
3,f

file3:

1,g
2,h
3,i

multijoin file1 file2 file3:

1,a,d,g
2,b,e,h
3,c,f,i

Copyright Ryan Marcus, 2016. GPLv3.