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send [-flags] string send to remote process
send_error [-flags] string send to stderr 
send_log [--] string send to log file (see log_file.) 
send_tty [-flags] string send to /dev/tty 
send_user [-flags] string send to stdout


 
Flags Significance
forces the next argument to be interpreted as a string rather than a flag.  Any string can be preceded by “—“ whether or not it actually looks like a flag.  This provides a reliable mechanism to specify variable strings without being tripped up by those that accidentally look like flags.  (All strings starting with “-“ are reserved for future options.)
-i spawn_id The -i flag declares that the string be sent to the named spawn_id.  If the spawn_id is user_spawn_id, and the terminal is in raw mode, newlines in the string are translated to return-newline sequences so that they appear as it the terminal was in cooked mode.  The -raw flag disables this translation.
-null number The -null flag sends null characters (0 bytes).  By default, one null is sent.  An integer may follow the -null to indicate how many nulls to send.
-break The -break flag generates a break condition.  This only makes sense if the spawn id refers to a tty device opened via “spawn -open”.  If you have spawned a process such as tip, you should use tip’s convention for generating a break.
-s
(uses send_slow)
The -s flag forces output to be sent “slowly”, thus avoid the common situation where a computer outtypes an input buffer that was designed for a human who would never outtype the same buffer.  This output is controlled by the value of the variable “send_slow” which takes a two element list.
-h
(uses send_human)
The -h flag forces output to be sent (somewhat) like a human actually typing.  Human-like delays appear between the characters.  (The algorithm is based upon a Weibull distribution, with modifications to suit this particular application.) This output is controlled by the value of the variable “send_human” which takes a five element list.


This material is excerpted from the O'Reilly book "Exploring Expect" by Don Libes, and can also be found in the manpage on many UNIX platforms. 

 

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