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REXEC(1)										 REXEC(1)

NAME
       rexec -- remote execution client for an exec server

SYNOPSIS
       rexec [ -abcdhns -l username -p password ] host command

DESCRIPTION
       Rexec  calls  the  rexec(3)  routine  to  act  as a client for the remote host's rexecd(8)
       server.

       It asks that ``command'' be run on the host computer, using username/password  authentica-
       tion. See rexec(3) and rexecd(8) for details of the protocol.

OPTIONS
       Rexec accepts several options, but only three are likely to be very useful:

       -l username

	      Set the log-in name on the remote host to username.

       -p password

	      Provide  the  password  for  the remote account.	The command line argument will be
	      blanked after being parsed, to prevent it from being seen with ps(1).  However,  it
	      is  still not very secure to type the password on the command line.  In particular,
	      be sure that the shell's history file is protected.

       -n     Explicitly prompt for name and password, even if provided in  the  environment,  in
	      the $HOME/.netrc file, or in the environmental variables REXEC_USER and REXEC_PASS.

       Other options that might be useful with non-standard remote exec daemons, or to debug con-
       nections:

       -a     Do not set up an auxiliary channel for standard  error  from  command;  the  remote
	      standard	error and output are then both returned on the local standard output.  By
	      default, rexec asks that a separate channel be set up for  diagnostic  output  from
	      the remote command.

       -b     Use  signal  handling  as  in  BSD  rsh(1).   Only the signals SIGINT, SIGQUIT, and
	      SIGTERM are echoed to the remote process.  They do not remain  raised  locally,  so
	      rexec  waits  for  the  remote  command  to shutdown its side of the socket.  Also,
	      CNTRL-Z will only suspend execution locally--the remote  command	may  continue  to
	      run.

       -c     Do  not close remote standard input when local standard input closes.  Normally the
	      standard input to the remote command is closed when the  local  standard	input  is
	      closed.

       -d     Turn  on	debugging  information. In particular the command sent to the remote host
	      will be echoed.

       -h     Print a usage message.

       -s     Do not echo signals received by the rexec onto the remote process.  Normally,  sig-
	      nals  which can be trapped are passed on to the remote process; then, when you type
	      CNTRL-C, the remote process terminates as well.

USERNAME AND PASSWORD
       Rexec(1) searches for the username and password in the following order:

	      1. If -n is given on the command line, the user will always be prompted  for  both,
	      even if they are also given on the command line.

	      2. The command line will be parsed

	      3.  If  the environmental variables REXEC_USER or REXEC_PASS are defined, they will
	      define the username or password.

	      4. The $HOME/.netrc file will be searched.  See ftp(1) for a  description  of  this
	      file's format.

	      5.  Finally,  the  user will be prompted if either the username or password remains
	      undefined.

SECURITY
       Users of this command should be aware that rexec(3) transmits their password to the remote
       host  clear  text,  not	encrypted.   If the network is not secure to the remote host, the
       password can be comprimised.

SIGNALS
       Without the -b option, all signals which can be handled are echoed to the remote  process.
       Afterwards,  however, they remain raised in the local process.  Typically, this means that
       rexec(1) will exit after receiving a fatal signal, even if the remote process has arranged
       to handle or ignore it.

       Differing operating systems use differing signal numbers; for example AIX and SunOS use 18
       for SIGTSTP (^Z), while Linux uses 20.  Therefore, it may have a different effect remotely
       than  locally.	In  particular, typing CNTL-Z may not suspend the execution of the remote
       process.

EXAMPLE
       rexec othermachine cat ">remote_file; date" <local_file

       will send local_file to the othermachine as remote_file.

BUGS
       Please send bug reports, system incompatibilities, and job offers to the author.

SEE ALSO
       rexec(3), rexecd(8), rsh(1)

AUTHOR
       Michael Sadd
       mas22@cornell.edu
       http://www.tc.cornell.edu/~sadd/

       Thanks to Orange Gopher (2/10/97) and  Johannes	Plass  (plass@dipmza.physik.uni-mainz.de,
       Oct. 17 1996) for useful suggestions.

					February 14, 1997				 REXEC(1)
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