I can do an
su <username> and it asks for my password. Is there a password parameter for
su such that i wont be prompted for a password?
su <username> -p <password>
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If you want to write a script that runs as a different user something like this works, though it dows output the word "password" without a newline to standard out
su - username <<! enterpasswordhere enter commands to run as the new user !
if you have a user named fred with a password of 1234 and want to get an ls of fred's home directory as fred, without the password string displayed, it would look like
su - fred <<! >/dev/null 2>&1 1234 whoami > /dev/tty ls > /dev/tty !
I belive, there is not and it would not be a good idea. Here's why:
If you write a password in a command like
su <username> -p <password>, it would be stored in plain text in your bash history. This is certainly a huge security issue.
If you need to run commands with
sudo) in an automated way, write a shellscript containig the commands without
sudo and run
su <username> script.sh