s6-portable-utils
Software
skarnet.org
s6-cat copies stdin to stdout.
s6-cat
s6-cat transfers data from stdin to stdout, until it receives EOF or gets killed.
On systems that support it (as of 2.0.0.0, only Linux 2.6.17 or later), s6-cat performs zero-copy transfer.
s6-cat is not suitable as a Single Unix cat program.