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Top Forums Shell Programming and Scripting How to use 'expect' to pass UID & Password to a "for loop" in shell script? Post 302873145 by thisissouvik on Monday 11th of November 2013 08:35:36 AM
Old 11-11-2013
How to use 'expect' to pass UID & Password to a "for loop" in shell script?

Friends,

Need someone's help in helping me with the below requirement for a script:

> For a list of servers(over 100+), I need to login into each of them(cannot configure password-less ssh) & grab few configuration details <

I know, this is possible through expect programming in a simple shell script, but unfortunately I'm not able to get one to work as required. Below is what I could manage to write without expected results:

Code:
cat server_list  
server1 
server2 
server3 
.. 
.. 
..

Code:
cat for_loop.sh  
for i in `cat server_list` 
do 
multibos -S 
done

Code:
cat expect_script.sh  

spawn /$HOME/for_loop.sh  
expect "*User_ID*" 
send "souvikm\r" 
expect "*Password*" 
send "passw0rd\r" 
expect eof

Code:
$> ./expect_script.sh

Running the above written expect script doesn't solve my purpose - it does nothing Smilie Could someone help me rectify this script or help me with a better idea?


-- Souvik

Last edited by thisissouvik; 11-11-2013 at 09:56 AM.. Reason: Reorganizing!
 

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CHSH(1)                                                            User Commands                                                           CHSH(1)

NAME
chsh - change login shell SYNOPSIS
chsh [options] [LOGIN] DESCRIPTION
The chsh command changes the user login shell. This determines the name of the user's initial login command. A normal user may only change the login shell for her own account; the superuser may change the login shell for any account. OPTIONS
The options which apply to the chsh command are: -h, --help Display help message and exit. -R, --root CHROOT_DIR Apply changes in the CHROOT_DIR directory and use the configuration files from the CHROOT_DIR directory. -s, --shell SHELL The name of the user's new login shell. Setting this field to blank causes the system to select the default login shell. If the -s option is not selected, chsh operates in an interactive fashion, prompting the user with the current login shell. Enter the new value to change the shell, or leave the line blank to use the current one. The current shell is displayed between a pair of [ ] marks. NOTE
The only restriction placed on the login shell is that the command name must be listed in /etc/shells, unless the invoker is the superuser, and then any value may be added. An account with a restricted login shell may not change her login shell. For this reason, placing /bin/rsh in /etc/shells is discouraged since accidentally changing to a restricted shell would prevent the user from ever changing her login shell back to its original value. FILES
/etc/passwd User account information. /etc/shells List of valid login shells. /etc/login.defs Shadow password suite configuration. SEE ALSO
chfn(1), login.defs(5), passwd(5). shadow-utils 4.5 01/25/2018 CHSH(1)
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