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visudo is what controls sudo permissions. this is how user gets to run commands with root level permissions. mount and umount are root commands that user normally does not have access to. by using the visudo you can give permissions to a user they dont own in their group.
# sudoers file.
# This file MUST be edited with the 'visudo' command as root.
# See the sudoers man page for the details on how to write a sudoers file.
# Host alias specification
# User alias specification
# Cmnd alias specification
# User privilege specification
root, rx30 ALL=(ALL) ALL
rx30 ALL =(root) NOPASSWD: /bin/dmesg -n 1, /usr/rx30/setroute.pl, /usr/bin/copyconfig.sh, /bin/mount -t iso9660 /dev/dvd /mnt/
dvd, /bin/umount /dev/dvd, /usr/bin/runit.sh, /usr/bin/dvd+rw-format -force /dev/dvd, /bin/mount /dev/dvd /mnt/dvd, /bin/mount -t
iso9660 /dev/cdrom /mnt/cdrom, /bin/umount /mnt/cdrom, /usr/bin/fixprinter
tdsrmtbk ALL=(root) NOPASSWD: /home/tdsrmtbk/getSystemConfig.sh, /home/tdsrmtbk/setRoute.sh
in the above example i bolded the 2 users in that file for the system I copy/pasted from. In the above example rx30 user has the rights to mount and umount the dvd and cdron as well as to copy some system files around.