OpenSSH 是 SSH （Secure SHell） 协议的免费开源实现。它用安全、加密的网络连接工具代替了 telnet、ftp、 rlogin、rsh 和 rcp 工具。OpenSSH 支持

				#	$OpenBSD: stderr-after-eof.sh,v 1.1 2002/03/23 16:38:09 markus Exp $				#	Placed in the Public Domain.								tid="stderr data after eof"								DATA=/etc/motd				DATA=${OBJ}/data				COPY=${OBJ}/copy								if have_prog md5sum; then					CHECKSUM=md5sum				elif have_prog openssl; then					CHECKSUM="openssl md5"				elif have_prog cksum; then					CHECKSUM=cksum				elif have_prog sum; then					CHECKSUM=sum				else					fatal "No checksum program available, aborting $tid test"				fi								# setup data				rm -f ${DATA} ${COPY}				cp /dev/null ${DATA}				for i in 1 2 3 4 5 6; do					(date;echo $i) | $CHECKSUM >> ${DATA}				done								${SSH} -2 -F $OBJ/ssh_proxy otherhost \					exec sh -c \'"exec > /dev/null; sleep 2; cat ${DATA} 1>&2 $s"\' \					2> ${COPY}				r=$?				if [ $r -ne 0 ]; then					fail "ssh failed with exit code $r"				fi				egrep 'Disconnecting: Received extended_data after EOF' ${COPY} &&					fail "ext data received after eof"				cmp ${DATA} ${COPY}	|| fail "stderr corrupt"								rm -f ${DATA} ${COPY}