This file is indexed.

/etc/sdm/sdm.config is in sdm-terminal 0.4.1-4.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# example /etc/sdm/sdm.config
# if present, /etc/sdm/sdm.config.$hostname will override these values

# autologin will attempt to automatically log in
#autologin=no

# username for login. defaults to hostname.
#username=

# ssh key to use for passwordless login. must have permissions set to u+rw
# and og-rwx. must be configured in the user's .ssh/authorized_keys file
# on the server.
#key=

# the name of the server.  must available in DNS or the /etc/hosts 
# file, as well as an appropriate entry in the /root/.ssh/known_hosts
#server=

# alternate server to use for anonymous logins
#anon_server=

# alternate username for anonymous login. defaults to hostname.
#anon_user=

# window manager or other command to execute.
#command=

# options that are passed to xsetroot, which controls the
# background color and/or images
#xsetroot="-solid darkblue"

# login text, defaults to "Welcome to $server"
#login_text=

# sdm-session.  could also set to /etc/X11/Xsession
#sdmsession=sdm-session