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Subject: Re: pam.d + pam_google_authenticator, per user configuration
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> Shell script to /usr/sbin/pam_not_root.sh:
>
> #!/bin/sh
> if [ $PAM_USER != "root" ]
> then
>     exit 0
> else
>     exit 1
> fi
Even simpler one liner:

#!/bin/sh
[ $PAM_USER != "root" ]