Switch user without prompting for a password in shell script

Question

I need to switch between two users using a shell script.

I used su and sudo for switching between users. The bottom line is that, it's prompting for user password every time, and I do not want that to happen.

I know the password; is there a way I can hard code it in the script itself, so that it will not prompt the user for a password?

su root systemctl restart postgresql.service part of my code — Gopinagh.R
– Gopinagh.R, Commented Aug 14, 2012 at 12:56

Thor · Accepted Answer · 2012-08-15 00:28:12Z

2

Wouldn't a NOPASSWD clause in sudoers work? For example:

user1 ALL=(ALL:ALL) NOPASSWD: /bin/su user2

Allows user1 to su to user2 without password. If you only need to run a certain command as user2, add that to sudoers (through visudo) explicitly:

user1 ALL=(user2) NOPASSWD: /path/to/command

Then as user1 run:

sudo -k user2 /path/to/command

answered Aug 15, 2012 at 0:28

Thor

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Community · Accepted Answer · 2017-05-23 12:12:18Z

1

With the -S parameter sudo accepts the password from Standard Input. See: How to pass the password to su/sudo/ssh without overriding the TTY?

edited May 23, 2017 at 12:12

CommunityBot

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answered Aug 14, 2012 at 13:00

rollstuhlfahrer

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