An old man, going a lone highway,
Came, at the evening, cold and gray,
To a chasm, vast, and deep, and wide,
Through which was flowing a sullen tide.

The old man crossed in the twilight dim;
The sullen stream had no fear for him;
But he turned, when safe on the other side,
And built a bridge to span the tide.

“Old man,” said a fellow pilgrim, near,
“You are wasting strength with building here;
Your journey will end with the ending day;
You never again will pass this way;
You’ve crossed the chasm, deep and wide-
Why build you this bridge at the evening tide?”

The builder lifted his old gray head:
“Good friend, in the path I have come,” he said,
“There followeth after me today,
A youth, whose feet must pass this way.

This chasm, that has been naught to me,
To that fair-haired youth may a pitfall be.
He, too, must cross in the twilight dim;
Good friend, I am building this bridge for him.”

By Will Allen Dromgoole

wc -l filename.csv gives the number of lines in a file.

split -l 65000 -d supertimeline.csv supertimeline will generate
multiple files named supertimeline.00 (01, 02, etc) with 65000 lines
each. -l is the line count and -d tells split to use digits for the
prefix instead of letters (00 instead of AA). The second supertimeline
parameter tells split to use supertimeline as the prefex. Omitting the
prefix (supertimeline) and -d will result in files named xaa, xab,
xac, xad, etc.