07-17-2002
You can disable telnet so that no one can use it (this will not effect things such as sendmail ) in /etc/inetd.conf by commenting out the entry and then sending a HUP to inetd.
Check out the man page for rsh (different from rsh - remote sh). Your system may be different but doing a find /usr/share/man -name "rsh*" you should see different files for rsh. I found it under man1m so I did a man -s1m rsh and got info on the restricted shell.
% man -s1m rsh
Maintenance Commands rsh(1M)
NAME
rsh, restricted_shell - restricted shell command interpreter
SYNOPSIS
/usr/lib/rsh [ -acefhiknprstuvx ] [ argument...]
DESCRIPTION
rsh is a limiting version of the standard command inter-
preter sh, used to restrict logins to execution environments
whose capabilities are more controlled than those of sh (see
sh(1) for complete description and usage).
When the shell is invoked, it scans the environment for the
value of the environmental variable, SHELL. If it is found
and rsh is the file name part of its value, the shell
becomes a restricted shell.
The actions of rsh are identical to those of sh, except that
the following are disallowed:
changing directory (see cd(1)),
setting the value of $PATH,
specifying path or command names containing /,
redirecting output (> and >>).
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LEARN ABOUT DEBIAN
netkit-rsh
RSH(1) BSD General Commands Manual RSH(1)
NAME
rsh -- remote shell
SYNOPSIS
rsh [-Kdnx] [-k realm] [-l username] host [command]
DESCRIPTION
Rsh executes command on host.
Rsh copies its standard input to the remote command, the standard output of the remote command to its standard output, and the standard error
of the remote command to its standard error. Interrupt, quit and terminate signals are propagated to the remote command; rsh normally termi-
nates when the remote command does. The options are as follows:
-K The -K option turns off all Kerberos authentication.
-d The -d option turns on socket debugging (using setsockopt(2)) on the TCP sockets used for communication with the remote host.
-l By default, the remote username is the same as the local username. The -l option allows the remote name to be specified. Kerberos
authentication is used, and authorization is determined as in rlogin(1).
-n The -n option redirects input from the special device /dev/null (see the BUGS section of this manual page).
If no command is specified, you will be logged in on the remote host using rlogin(1).
Shell metacharacters which are not quoted are interpreted on local machine, while quoted metacharacters are interpreted on the remote
machine. For example, the command
rsh otherhost cat remotefile >> localfile
appends the remote file remotefile to the local file localfile, while
rsh otherhost cat remotefile ">>" other_remotefile
appends remotefile to other_remotefile.
FILES
/etc/hosts
SEE ALSO
rlogin(1), kerberos(3), krb_sendauth(3), krb_realmofhost(3)
HISTORY
The rsh command appeared in 4.2BSD.
BUGS
If you are using csh(1) and put a rsh in the background without redirecting its input away from the terminal, it will block even if no reads
are posted by the remote command. If no input is desired you should redirect the input of rsh to /dev/null using the -n option.
You cannot run an interactive command (like rogue(6) or vi(1)) using rsh; use rlogin(1) instead.
Stop signals stop the local rsh process only; this is arguably wrong, but currently hard to fix for reasons too complicated to explain here.
Linux NetKit (0.17) August 15, 1999 Linux NetKit (0.17)