# Method 1
# Disable account while still retain “sudo su userX”
# Block a user
chage -E 0 userX
# Set account as expired
usermod –expiredate 1 userX
# Method 2
# This will render “sudo su userX” inaccessible
# Note: this method doesn’t disable other authentication tokens (e.g. ssh keys)
# Lock account
passwd -l userX
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