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EXPECT(1)                   General Commands Manual                  EXPECT(1)



NAME
       at, drain, expect, pass - dialer scripting tools

SYNOPSIS
       dial/at [ -q ] [ -t seconds ] atcommand
       dial/expect [ -iq ] [ -t seconds ] goodstring [ badstring...  ]
       dial/drain
       dial/pass [ -q ]

DESCRIPTION
       These  commands are used to write telephone dialing scripts, mostly for
       PPP sessions.  They all expect standard input and  output  to  be  con‐
       nected to a communications device, e.g, a serial line to a modem.  They
       communicate with the user using /dev/cons.

       At sends atcommand to the modem prefixed with the string at.   It  then
       reads  from the modem expecting an AT response.  At will return success
       if it gets and OK of CONNECT response.  Otherwise it  will  return  the
       response as an error status.  The options are:

       -t     set the timeout to seconds.  The default is 300.

       -q     don't write to /dev/cons what is read from standard in.  The de‐
              fault is to copy everything through.

       Expect reads standard input looking for one of the strings given as ar‐
       guments.   Reading  the  first  string  causes a successul exit status.
       Reading any of the others causes an exit status equal  to  the  string.
       The command also terminates on a timeout.  The options are:

       -t     set the timeout to seconds.  The default is 300.

       -i     ignore case when doing the matches.

       -q     don't write to /dev/cons what is read from standard in.  The de‐
              fault is to copy everything through.

       Pass copies input from /dev/cons to standard output.  It terminates  on
       a  newline.   The only flag is -q and means the same as it does for ex‐
       pect.

       Drain discards any input waiting on standard input.  It is used to sync
       up the stream at the start of dialing or after an error.

EXAMPLE
       The  following  rc script dials out through a Hayes compatible modem on
       /dev/eia1 and lets the user type in a user  name  and  password  before
       starting ppp.
       #!/bin/rc
       dev=/dev/eia1
       telno=18005551212

       fn initfn {
            dial/drain
            echo +++
            dial/at zh0
       }

       fn dialfn {
            dial/drain
            dial/at dt^$telno
       }
       {
            # set up uart
            if( test -e $dev^ctl ){
                 echo -n b^$baud
                 echo -n m1     # cts/rts flow control
                 echo -n q64000 # big buffer
                 echo -n n1     # nonblocking writes
                 echo -n r1     # rts on
                 echo -n d1     # dtr on
                 echo -n c1     # handup when we lose dcd
            } > $dev^ctl

            # get the modem's attention
            while( ! initfn )
                 sleep 1

            # dial
            while( ! dialfn )
                 sleep 30

            if( ! dial/expect -it 60 'username:' ){
                 echo can''t connect >[1=2]
                 exit connect
            }
            dial/pass
            if( ! dial/expect -it 60 'password:' ){
                 echo can''t connect >[1=2]
                 exit connect
            }
            dial/pass
            if( ! dial/expect -t 60 'ppp or telnet:' ){
                 echo can''t connect >[1=2]
                 exit connect
            }
            echo ppp
            dial/expect -t 5 something
            echo connected >[1=2]

            # start ppp
            ip/ppp $primary -f
       } < $dev > $dev

FILES
       /rc/bin/ipconf/* example dialer scripts for ppp

SOURCE
       /sys/src/cmd/dial/*.c

SEE ALSO
       ppp(8), telco(4)



                                                                     EXPECT(1)