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How to give password at run time in a shell script?

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# 1  
Old 05-15-2013
How to give password at run time in a shell script?
hi,

how can i pass a password automatically when a shell script is running.

i have shell script(runscript.sh) which call another shell script inside it as a different user.

runscript.sh contains

Code:
su - nemo -c "/bin/main_script.sh"

but when i execute "runscript.sh" it try to run main_script.sh and prompts for a password. so i have to give the password manually. is there a way so that the script automatically reads a password? or is there a way so it doesnot prompt for a password at all?
# 2  
Old 05-15-2013
sudo serves this purpose.
# 3  
Old 05-15-2013
how? please give some examples.. what option do i have to use with sudo?
# 4  
Old 05-15-2013
Your sysadmin would have to set that up.

There's also a possibility of using expect, if you don't mind having your password stored in plain text.

Expect Thread
# 5  
Old 05-15-2013
idnt have expect and spawn command installed in putty. is there a way in which i can i can pass the password in the same line as

Code:
su - nemo <password>

# 6  
Old 05-15-2013
No. .
# 7  
Old 05-15-2013
is it possible to use expect command without the spawn command.? if it is possible then how?
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