LINUX How to configure sudoers file

Just edit the file /etc/sudoers
# 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

# Defaults specification

# User privilege specification
root    ALL=(ALL) ALL
userA    ALL=(ALL) ALL
userB   ALL=(ALL) ALL

# 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

# Samples
# %users  ALL=/sbin/mount /cdrom,/sbin/umount /cdrom
# %users  localhost=/sbin/shutdown -h now

userC       ALL=NOPASSWD: /usr/sbin/chroot, /bin/su - userC
unknown-mail       ALL=NOPASSWD: /bin/chmod -R 777 /usr/local/src/deploy/blog/cache/
unknown-mail       ALL=NOPASSWD: /bin/chmod -R 777 /usr/local/src/deploy/site/cache/

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