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expect

Posted by technocrat2004 (technocrat2004), 19 April 2006
Hi friends this is the script that I am running..  I am trying for the first match of "hi"...

set timeout 30
expect "^hi"
puts "got hi"

************************************
THis is the output I am getting. In two runs I am getting these outputs

[root@localhost TCL]# expect test3.tcl
hi
got hi
[root@localhost TCL]# expect test3.tcl
fdsd
fdfsa
ere
hi
^hire
^hi
df
fd
ere
afg
re
g
e
got hi
[root@localhost TCL]#


Can any one please tell me what exactly is happening....

Posted by technocrat2004 (technocrat2004), 19 April 2006
I am not getting why in the second run I am not getting the match even when I type  "hi"

Posted by admin (Graham Ellis), 20 April 2006
The ^ is causing it to check the response to see if it starts with hi, rather than looking for the first hi in the response.   You want to write simply

Code:
set timeout 30
expect "hi"
puts "got hi"


to look for the first hi, as expect will return to you as soon as it gets the first match anyway;  there will though be a delay when your entering data at the keyboard (as you did in this example) until you press the ENTER key, since the operating system buffers up data and only passes it into expect when a line is completed.

In you second example, you got a misleading "got hi" message after 30 seconds - the timeout.  There was no match.



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