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0

I'm using a bash script to log into a telnet server and execute a number of commands. It looks like:

login_and_run.sh

#!/bin/bash



unset TELNET_USER_NAME_STRING

unset TELNET_PASSWORD_STRING

unset TELNET_USER_NAME

unset TELNET_PASSWORD



TELNET_USER_NAME_STRING=`cat SAP_output`

TELNET_PASSWORD_STRING="Password:"



TELNET_USER_NAME="UserNam3r"

TELNET_PASSWORD="Passw0rdr"



# Expect script starts here

expect <<- DONE

        spawn telnet localhost 50008

        expect '$TELNET_USER_NAME_STRING'

        send "$TELNET_USER_NAME"

        sleep 3

        expect "$TELNET_PASSWORD_STRING"

        send "$TELNET_PASSWORD"

        sleep 3

        spawn ls

        expect eof

DONE

where

SAP_output:

Trying ::1...

Trying 127.0.0.1...

Connected to localhost.

Escape character is '^]'.



   ***********************************************

   **********************************************

   ****###*******####*****#######**************

   **##***##****##**##****##****##************

   ***##*******##****##***##****##**********

   *****##*****########***######***********

   ******##****##****##***##*************

   **##***##**##******##**##************

   ****###****##******##**##**********

   **********************************

   ********************************



   Telnet Administration

   SAP Java EE Application Server v7.50





User name:

telnet logs in, I get the banner, but it stops there (as if the strings are not matching). Would it be safer to use wildcards instead of the exact response (and match only " User name: ")?

shell-script login expect pattern-matching

share|improve this question

edited 2 days ago

Sebi

asked 2 days ago

SebiSebi

42811 gold badge1010 silver badges2525 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Note that single quotes have no special meaning in expect/tcl. You are expecting to see literal single quotes.
  
  – glenn jackman
  yesterday
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Also, expect uses rn for newlines, and that file, I'm guessing, does not contain carriage returns.
  
  – glenn jackman
  yesterday
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  When composing an expect program, turn on verbose debugging with exp_internal 1 -- that will show you when your patterns are not matching.
  
  – glenn jackman
  yesterday
  

  
  
  
  

add a comment | 

0

I'm using a bash script to log into a telnet server and execute a number of commands. It looks like:

login_and_run.sh

#!/bin/bash



unset TELNET_USER_NAME_STRING

unset TELNET_PASSWORD_STRING

unset TELNET_USER_NAME

unset TELNET_PASSWORD



TELNET_USER_NAME_STRING=`cat SAP_output`

TELNET_PASSWORD_STRING="Password:"



TELNET_USER_NAME="UserNam3r"

TELNET_PASSWORD="Passw0rdr"



# Expect script starts here

expect <<- DONE

        spawn telnet localhost 50008

        expect '$TELNET_USER_NAME_STRING'

        send "$TELNET_USER_NAME"

        sleep 3

        expect "$TELNET_PASSWORD_STRING"

        send "$TELNET_PASSWORD"

        sleep 3

        spawn ls

        expect eof

DONE

where

SAP_output:

Trying ::1...

Trying 127.0.0.1...

Connected to localhost.

Escape character is '^]'.



   ***********************************************

   **********************************************

   ****###*******####*****#######**************

   **##***##****##**##****##****##************

   ***##*******##****##***##****##**********

   *****##*****########***######***********

   ******##****##****##***##*************

   **##***##**##******##**##************

   ****###****##******##**##**********

   **********************************

   ********************************



   Telnet Administration

   SAP Java EE Application Server v7.50





User name:

telnet logs in, I get the banner, but it stops there (as if the strings are not matching). Would it be safer to use wildcards instead of the exact response (and match only " User name: ")?

shell-script login expect pattern-matching

share|improve this question

edited 2 days ago

Sebi

asked 2 days ago

SebiSebi

42811 gold badge1010 silver badges2525 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Note that single quotes have no special meaning in expect/tcl. You are expecting to see literal single quotes.
  
  – glenn jackman
  yesterday
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Also, expect uses rn for newlines, and that file, I'm guessing, does not contain carriage returns.
  
  – glenn jackman
  yesterday
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  When composing an expect program, turn on verbose debugging with exp_internal 1 -- that will show you when your patterns are not matching.
  
  – glenn jackman
  yesterday
  

  
  
  
  

add a comment | 

I'm using a bash script to log into a telnet server and execute a number of commands. It looks like:

login_and_run.sh

#!/bin/bash



unset TELNET_USER_NAME_STRING

unset TELNET_PASSWORD_STRING

unset TELNET_USER_NAME

unset TELNET_PASSWORD



TELNET_USER_NAME_STRING=`cat SAP_output`

TELNET_PASSWORD_STRING="Password:"



TELNET_USER_NAME="UserNam3r"

TELNET_PASSWORD="Passw0rdr"



# Expect script starts here

expect <<- DONE

        spawn telnet localhost 50008

        expect '$TELNET_USER_NAME_STRING'

        send "$TELNET_USER_NAME"

        sleep 3

        expect "$TELNET_PASSWORD_STRING"

        send "$TELNET_PASSWORD"

        sleep 3

        spawn ls

        expect eof

DONE

where

SAP_output:

Trying ::1...

Trying 127.0.0.1...

Connected to localhost.

Escape character is '^]'.



   ***********************************************

   **********************************************

   ****###*******####*****#######**************

   **##***##****##**##****##****##************

   ***##*******##****##***##****##**********

   *****##*****########***######***********

   ******##****##****##***##*************

   **##***##**##******##**##************

   ****###****##******##**##**********

   **********************************

   ********************************



   Telnet Administration

   SAP Java EE Application Server v7.50





User name:

telnet logs in, I get the banner, but it stops there (as if the strings are not matching). Would it be safer to use wildcards instead of the exact response (and match only " User name: ")?

shell-script login expect pattern-matching

share|improve this question

edited 2 days ago

Sebi

asked 2 days ago

SebiSebi

42811 gold badge1010 silver badges2525 bronze badges

#!/bin/bash



unset TELNET_USER_NAME_STRING

unset TELNET_PASSWORD_STRING

unset TELNET_USER_NAME

unset TELNET_PASSWORD



TELNET_USER_NAME_STRING=`cat SAP_output`

TELNET_PASSWORD_STRING="Password:"



TELNET_USER_NAME="UserNam3r"

TELNET_PASSWORD="Passw0rdr"



# Expect script starts here

expect <<- DONE

        spawn telnet localhost 50008

        expect '$TELNET_USER_NAME_STRING'

        send "$TELNET_USER_NAME"

        sleep 3

        expect "$TELNET_PASSWORD_STRING"

        send "$TELNET_PASSWORD"

        sleep 3

        spawn ls

        expect eof

DONE

Trying ::1...

Trying 127.0.0.1...

Connected to localhost.

Escape character is '^]'.



   ***********************************************

   **********************************************

   ****###*******####*****#######**************

   **##***##****##**##****##****##************

   ***##*******##****##***##****##**********

   *****##*****########***######***********

   ******##****##****##***##*************

   **##***##**##******##**##************

   ****###****##******##**##**********

   **********************************

   ********************************



   Telnet Administration

   SAP Java EE Application Server v7.50





User name:

share|improve this question

edited 2 days ago

Sebi

asked 2 days ago

SebiSebi

42811 gold badge1010 silver badges2525 bronze badges

share|improve this question

edited 2 days ago

Sebi

asked 2 days ago

SebiSebi

42811 gold badge1010 silver badges2525 bronze badges

asked 2 days ago

SebiSebi

42811 gold badge1010 silver badges2525 bronze badges

asked 2 days ago

SebiSebi

42811 gold badge1010 silver badges2525 bronze badges

1 Answer
1

active

oldest

votes

0

Figured it out:

TELNET_USER_NAME_STRING='*name:*'



TELNET_PASSWORD_STRING='*assword:*'



TELNET_USER_NAME='UserNam3r'

TELNET_PASSWORD='Passw0rdr'



# Expect script starts here

expect <<- DONE

        spawn telnet localhost 50008

        expect '$TELNET_USER_NAME_STRING'

        send "$TELNET_USER_NAME"

        expect '$TELNET_PASSWORD_STRING'

        send "$TELNET_PASSWORD"

        # Check if we're logged in

        expect eof

DONE

Use wildcards instead of the full banner and return line character 'r' to 'press' enter.

Edit:

This is a far more elegant answer.

share|improve this answer

edited 2 days ago

answered 2 days ago

SebiSebi

42811 gold badge1010 silver badges2525 bronze badges

add a comment | 

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0

Figured it out:

TELNET_USER_NAME_STRING='*name:*'



TELNET_PASSWORD_STRING='*assword:*'



TELNET_USER_NAME='UserNam3r'

TELNET_PASSWORD='Passw0rdr'



# Expect script starts here

expect <<- DONE

        spawn telnet localhost 50008

        expect '$TELNET_USER_NAME_STRING'

        send "$TELNET_USER_NAME"

        expect '$TELNET_PASSWORD_STRING'

        send "$TELNET_PASSWORD"

        # Check if we're logged in

        expect eof

DONE

Use wildcards instead of the full banner and return line character 'r' to 'press' enter.

Edit:

This is a far more elegant answer.

share|improve this answer

edited 2 days ago

answered 2 days ago

SebiSebi

42811 gold badge1010 silver badges2525 bronze badges

add a comment | 

0

Figured it out:

TELNET_USER_NAME_STRING='*name:*'



TELNET_PASSWORD_STRING='*assword:*'



TELNET_USER_NAME='UserNam3r'

TELNET_PASSWORD='Passw0rdr'



# Expect script starts here

expect <<- DONE

        spawn telnet localhost 50008

        expect '$TELNET_USER_NAME_STRING'

        send "$TELNET_USER_NAME"

        expect '$TELNET_PASSWORD_STRING'

        send "$TELNET_PASSWORD"

        # Check if we're logged in

        expect eof

DONE

Use wildcards instead of the full banner and return line character 'r' to 'press' enter.

Edit:

This is a far more elegant answer.

share|improve this answer

edited 2 days ago

answered 2 days ago

SebiSebi

42811 gold badge1010 silver badges2525 bronze badges

add a comment | 

Figured it out:

TELNET_USER_NAME_STRING='*name:*'



TELNET_PASSWORD_STRING='*assword:*'



TELNET_USER_NAME='UserNam3r'

TELNET_PASSWORD='Passw0rdr'



# Expect script starts here

expect <<- DONE

        spawn telnet localhost 50008

        expect '$TELNET_USER_NAME_STRING'

        send "$TELNET_USER_NAME"

        expect '$TELNET_PASSWORD_STRING'

        send "$TELNET_PASSWORD"

        # Check if we're logged in

        expect eof

DONE

Use wildcards instead of the full banner and return line character 'r' to 'press' enter.

Edit:

This is a far more elegant answer.

share|improve this answer

edited 2 days ago

answered 2 days ago

SebiSebi

42811 gold badge1010 silver badges2525 bronze badges

TELNET_USER_NAME_STRING='*name:*'



TELNET_PASSWORD_STRING='*assword:*'



TELNET_USER_NAME='UserNam3r'

TELNET_PASSWORD='Passw0rdr'



# Expect script starts here

expect <<- DONE

        spawn telnet localhost 50008

        expect '$TELNET_USER_NAME_STRING'

        send "$TELNET_USER_NAME"

        expect '$TELNET_PASSWORD_STRING'

        send "$TELNET_PASSWORD"

        # Check if we're logged in

        expect eof

DONE

share|improve this answer

edited 2 days ago

answered 2 days ago

SebiSebi

42811 gold badge1010 silver badges2525 bronze badges

answered 2 days ago

SebiSebi

42811 gold badge1010 silver badges2525 bronze badges

answered 2 days ago

SebiSebi

42811 gold badge1010 silver badges2525 bronze badges