Be sure python 3 is installed
If your file looks like this:
foo1,bar1,SAME,baz1,foo2,bar2,SAME,baz2,foo3,bar3,SAME,baz3
Do this:
❯ python3 csvsplit.py sample_in.csv --pattern SAME
...and get this:
foo1,bar1,SAME,baz1
foo2,bar2,SAME,baz2
foo3,bar3,SAME,baz3
❯ python3 csvsplit.py --help