rcmd(1) - NetBSD Manual Pages

RCMD(1)                     NetBSD Reference Manual                    RCMD(1)


NAME

     rcmd - backend driver for rcmd(3).


SYNOPSIS

     rcmd [-Kdnx] [-k realm] [-l username] [-u localusername] host command


DESCRIPTION

     rcmd executes command on host.

     rcmd 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; rcmd normally terminates
     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.

     -k    The -k option causes rcmd to obtain tickets for the remote host in
           realm instead of the remote host's realm as determined by
           krb_realmofhost(3).

     -l    By default, the remote username is the same as the local username.
           The -l option allows the remote name to be specified.  Kerberos au-
           thentication is used, and authorization is determined as in
           rlogin(1).

     -u    The -u option allows the local username to be specified.  Only the
           superuser is allowed to use this option.

     -n    The -n option redirects input from the special device /dev/null
           (see the BUGS section of this manual page).

     -x    The -x option turns on DES encryption for all data exchange.  This
           may introduce a significant delay in response time.

     Shell metacharacters which are not quoted are interpreted on local ma-
     chine, while quoted metacharacters are interpreted on the remote machine.
     For example, the command

           rcmd otherhost cat remotefile >> localfile

     appends the remote file remotefile to the local file localfile, while

           rcmd otherhost cat remotefile ">>" other_remotefile

     appends remotefile to other_remotefile.


FILES

     /etc/hosts


SEE ALSO

     rsh(1), kerberos(3), krb_sendauth(3), krb_realmofhost(3)


HISTORY

     The rcmd command appeared in NetBSD 1.3 and is primarily derived from
     rsh(1).  Its purpose was to create a backend driver for rcmd(3) that
     would allow the users of rcmd(3) to no longer require super-user privi-
     leges.


BUGS

     If you are using csh(1) and put a rcmd in the background without redi-
     recting 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 rcmd to /dev/null using the -n option.

     You cannot use rcmd to run an interactive command (like rogue(6) or
     vi(1)).  Use rlogin(1) instead.

     The stop signal, SIGSTOP, will stop the local rcmd process only.  This is
     arguably wrong, but currently hard to fix for reasons too complicated to
     explain here.

NetBSD 1.5                     February 15, 1997                             2