[tardo99]

They mean stdout, right?

[forkerenok]

Depends on from where you look :)

It is stdout for the previous process in the pipeline and stdin for the tosheets itself.

EDIT: Tosheets -> tosheets

[jwilk]

tosheets just reads stuff from stdin. It doesn't care if it's attached to a pipe or not. It might be that there's no "previous process" at all.

[thomastjeffery]

No.

From "tosheets"'s stdin to sheets.