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DCON(1) General Commands Manual DCON(1) NAME dcon, ndcon, rlogin, nrx, rsh, scriptcon - remote login and execution SYNOPSIS dcon [ option ... ] machine ndcon machine rlogin machine nrx machine [ command-word ... ] rsh [ option ... ] machine [ command-word ... ] scriptcon machine script DESCRIPTION Do not read this page unless you are familiar with con(1). Dcon, ndcon, and rlogin are analogs (or special cases) of con(1) for specific kinds of network connection. They support the same local es- cape convention with the quit signal. Similarly, nrx and rsh are analogs of rx. Network addresses are as in con(1). The default networks for the vari- ous commands are dcon, ndcon, nrx dk rlogin, rsh tcp Dcon connects to the remote machine, and attempts automatically to log in under the login id of the invoking user. Option -l turns off auto- matic login; the remote machine will ask for a login id and password. Ndcon behaves like dcon but provides a more transparent transport pro- tocol. In particular terminal line disciplines are preserved and it is possible to download into a mux(9.1) window across an ndcon connection. Rlogin is like dcon, but uses the connection protocol found on Berkeley systems. Rx (see con(1)) executes one shell command on the remote machine as if logged in there, with local standard input and output. It uses a con- nection protocol specific to Research machines. Nrx is to rx as ndcon is to dcon: it runs a command remotely with line discipline preserved. Rsh is to rx as rlogin is to dcon: it runs a command remotely using the Berkeley execution protocol. Scriptcon provides a connection like dcon -l, except that the login and other initial protocol are controlled by a script file. The first line of the file gives a string (e.g. expected from the remote machine; the second gives the local response, and so on in alternation. Unrecog- nized data from the remote machine are ignored. Warning: a script that contains a password may compromise the security of the remote system, hence scriptcon should be used only for restricted logins. Con tries to connect using the protocol of ndcon; if that fails, it tries that of dcon, then that of rlogin. Rx attempts its own style of connection; if that fails, it tries that of rsh. SEE ALSO con(1), dkmgr(8), svcmgr(8), tcpmgr(8), ipc(3) D. L. Presotto, `Interprocess Communication in the Eighth Edition UNIX System', this manual, Volume 2 BUGS If a program run by nrx won't let go, for example by ignoring signals, there is no way of getting out short of hanging up. There is no error correction or retry in a scriptcon script. DCON(1)