comprehensive expect examples Post: 302356276

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Top Forums Shell Programming and Scripting comprehensive expect examples Post 302356276 by Gavster on Friday 25th of September 2009 04:33:50 AM

09-25-2009

Registered User

Hi,

I wrote an expect script to log in to all cisco switches on our network which uses telnet. The main problem for me was that the usernames and passwords weren't consistent across all switches. My code looked like this ...

Code:

log_file -noappend ./CDP_LOGS/$ip_addr.log
# This spawns the telnet program and connects it to the IP address
 spawn telnet $ip_addr
 #The script expects Password or Username or times out if no response is seen
 expect {
   "Password: "  {login1a $ip_addr}
   "Username: "  {login2a $ip_addr}
   timeout       {abort $ip_addr 1}
 }
 log_file

If "Password: " or "Username: " are identified, the appropriate proc is called (either login1a or login2a respectively). Once logged in successfully, you can continue to send commands using this construct:

Code:

send "command"
 while {1} {
   expect "some output 1" {
     do stuff
   } "some output 2" {
     do stuff
     break
   } "some output 3" {
     do stuff
     break
   }
 }

This expects multiple things and reacts accordingly.

All my output was logged to a file which I used for post-processing.

Hope this is helpful.

Gavin

Last edited by Gavster; 09-25-2009 at 11:06 AM..

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RBASH(1)						      General Commands Manual							  RBASH(1)

NAME

       rbash - restricted bash, see bash(1)

RESTRICTED SHELL

       If  bash  is  started with the name rbash, or the -r option is supplied at invocation, the shell becomes restricted.  A restricted shell is
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       o      specifying command names containing /

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       o      parsing the value of SHELLOPTS from the shell environment at startup

       o      redirecting output using the >, >|, <>, >&, &>, and >> redirection operators

       o      using the exec builtin command to replace the shell with another command

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SEE ALSO

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