> Operator | (a pipe), "forces" a command, which is a promise of output, on its left producing a stream, an argument for a command on the right-hand side of the

> Operator | (a pipe), "forces" a command, which is a promise of output, on its left producing a stream, an argument for a command on the right-hand side of the pipe. A shell pipe thus is an equivalent of a monadic >>= operator. Why is this monadic and not just function composition? Why not just identify `a|b` with `b.a` and `a;b` with `seq a b`?