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Comment by jph00 | Hacker News Reader

Here's a single line you can run that'll add the needed line to the file in the correct place for you:

    sudo perl -pi -e 's/(pam_smartcard.so)/$1\nauth sufficient pam_tid.so/' /etc/pam.d/sudo

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Thanks for sharing. While tweaking the formatting, I accidentally introduced a typo which led to me spending a few minutes hunting for a fix for "sudo: unable to initialize PAM: No such process" without having to reboot :(

Anyway, here's the version of your one-liner I used to preserve the spacing used in the rest of the file:

   sudo perl -pi -e 's/(pam_smartcard.so)/$1\nauth       sufficient     pam_tid.so/' /etc/pam.d/sudo

Or something like

    printf '%s\n' '/pam_smartcard\.so/a' 'auth sufficient pam_tid.so' . wq | sudo ex -s /etc/pam.d/sudo

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