login(7) - Unix First Edition Manual Page
11/3/71LOGIN, LOGOUT

(VII)
NAME logging in and logging out
SYNOPSIS
DESCRIPTION UNIX must be called from an appropriate terminal. The twogeneral classes of terminals which UNIX supports are


typified by the 37 Teletype on the one hand and the GETermiNet 300 and Memorex 1240 on the other. The principal difference is the baud rate (150 vs. 300) and the treatmentof the carriage return character. Most terminals operating at 150, 300, or 1200 baud using the ASCII character seteither work (more or less) at the moment or can be used by special arrangement. In particular, special arrangement isnecessary for terminals which do not generate lower--case ASCII characters. It is also necessary to have a valid UNIX user ID and (ifdesired) password. These may be obtained, together with the telephone number, from the system administrators.


The same telephone number serves terminals operating at boththe standard speeds. When a connection is established via a 150--baud terminal (e.g. TTY 37) UNIX types out "login:" ;you respond with your user name, and, if a mask is typed, with a password. If the login was successful, the @character is typed by the Shell to indicate login is complete and commands may be issued. A message of the daymay be typed if there are any announcements. Also, if there is a file called mailbox , you are notified that someone hassent you mail. (See the mail command.)


From a 300--baud terminal, the procedure is slightlydifferent. Such terminals often have a full--duplex switch, which should be turned on (or conversely, half--duplex shouldbe turned off). When a connection with UNIX is established, a few garbage characters are typed (these are the login:message at the wrong speed). You should depress the "break" key; this is a speed--independent signal to UNIX that a 300--baud terminal is in use. It will type login: (at the correct speed this time) and from then on the procedure is the sameas described above.


Logging out is simple by comparison (in fact, sometimes toosimple). Simply generate an end--of--file at Shell level using the EOT character; the "login:" message will appear again toindicate that you may log in again.


11/3/71LOGIN, LOGOUT

(VII)


It is also possible to log out simply by hanging up theterminal; this simulates an end--of--file on the typewriter.
FILES
SEE_ALSO init
DIAGNOSTICS
BUGS Hanging up on programs which never read the typewriter orwhich ignore end--of--files is very dangerous; in the worst


cases, the programs can only be halted by restarting thesystem.


OWNER ken, dmr



11/3/71 /ETC/MSH (VII)
NAME msh -- mini-shell
SYNOPSIS
DESCRIPTION msh is a heavily simplified version of the Shell. It readsone line from the standard input file, interprets it as a


command, and calls the command. The mini--shell supports few of the advanced features of theShell; none of the following characters is special:


> < $ \ ; & However, "*" and "?" are recognized and glob is called. Themain use of msh is to provide a command--executing facility for various interactive sub-systems.
FILES
SEE_ALSO sh, glob
DIAGNOSTICS
BUGS
OWNER ken, dmr



11/3/71 /ETC/SUFTAB (VII)
NAME suftab -- suffix table
SYNOPSIS
DESCRIPTION suftab is a table of suffixes used to guide hyphenation inroff. Its first 12 words are not used (see a.out format) Its


next 26 words point to the beginning of the subtables foreach of the 26 initial letters of a suffix. The first entry for each suffix is a count of the number of bytes in thesuffix. The second byte of each entry is a flag indicating the type of suffix. The suffix itself follows; the high bitsof each letter indicate where the hyphens come. The table for each initial suffix letter ends with a zero count byte.
FILES
SEE_ALSO roff
DIAGNOSTICS
BUGS
OWNER jfo, dmr, ken



11/3/71 /ETC/TABS (VII)
NAME tabs -- tab stop set
SYNOPSIS cat /etc/tabs
DESCRIPTION When printed on a suitable terminal, this file will set tabstops at columns 8, 16, 24, 32, .... Suitable terminals


include the Teletype model 37 and the GE TermiNet 300. Since UNIX times delays assuming tabs set every 8, this hasbecome a defacto `standard.'


FILES
SEE_ALSO
DIAGNOSTICS
BUGS
OWNER ken

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