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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 authentication. 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 connections:

-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 diagnos-
tic 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, signals 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.