ctpsv(3) on Linux
The text ae60f5f74788, as Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it.
solve one of the systems of equations A*x = b, or A'*x = b, or conjg( A' )*x = b,