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# 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
#User_Alias PU = andrew
# Cmnd alias specification
Cmnd_Alias HALT = /usr/sbin/halt
Cmnd_Alias SHELLS = /usr/bin/
# Defaults specification
# Runas alias specification
# User privilege specification
root ALL=(ALL) ALL
#PU ALL= KILL
andrew ALL= SHELLS
# Uncomment to allow people in group wheel to run all commands
# %wheel ALL=(ALL) ALL
# Same thing without a password
# %wheel ALL=(ALL) NOPASSWD: ALL
Which password are you entering? david's or andrew's? Wouldn't it be easier to just make david and andrew part of some group, say the shutdown group, and then give any user in that group sudo permission to shutdown?