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help with redirectioning output

Posted by pmnf (pmnf), 22 July 2004
I ppl im new to expect and to this forum. this as you can see my first post of many
My problem is the folowing.
i want to connect to a remote machine via telenet run a script name extract.sh grab the output of the script and store it in a file.

In this moment i am doing the folowing
#!/usr/bin/expect -f
#
log_file -a MY_OUTPUT
set user xpto
set password xpto
set site remote.address.pt
set VAR 1
set T 0
spawn telnet $site
while {$VAR>0} {
#puts $VAR
     expect {
           "login:" {
                 set rcvd $expect_out(buffer)
                 send "$user\r"
                 }
           "$user's Password:" {
                 send "pulso.2\r"
                 send "\n"
                 send  "cd nagios ;"
                 set rcvd $expect_out(buffer)
                 expect {
                       "bash#" {
                             send "./extract.sh\r"
                                   }                  
                       }
                             }
           
           }      
if {$T>3} exit
incr T
}
exit

############
this is working but i think this isnt very good programing.
what i really want to do is to run the program like this
$ program.excpt >> AFILE &
"AFILE : contains the result of the extract.sh
Any ideas


Posted by admin (Graham Ellis), 23 July 2004
I think you want to

a) start with

log_user 0

to turn off echo to stdout of all the text that comes back before you run your ./extract.sh

b) add an extra expect after your

send ./extract.sh

to cause expect to wait for the next shell prompt, then when you have it add a

puts $expect_out(buffer)

to send your output to stdout ... which your >> will cause to be redirected onto the end of the file at runtime.  You may need / want to puts an extra newline, datestamp, or header too so that you can easily analyse your logfile later on.

Graham

P.S.  Test it without the log_user line at first when you add the extra code in - otherwise if you have any bugs that cause the carefully choreographed exchange to fail, you won't know where they are.  

Posted by pmnf (pmnf), 23 July 2004
Thanks working allready



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Comment: "Please describe how you did the redirection using a code ..."
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Comment by Sathya (published 2011-08-18)
Please describe how you did the redirection using a code snippet. [#3969]

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