MacGetInfo.sh

#!/bin/bash
# Ensures that script is run as ROOT
if [[ "${UID}" != 0 ]]; then
	(echo >&2 "Error: $0 script must be run as root")
	exit 1
fi

# Ensures that the system is not domain bound
readonly domainBoundCheck=$(dsconfigad -show)
if [[ "${domainBoundCheck}" ]]; then
	(echo >&2 "Cannot run on domain bound system. Unbind system and try again.")
	exit 1
fi

oldUser=$1

# Test to ensure logged in user is not being renamed
readonly loggedInUser=$(ls -la /dev/console | cut -d " " -f 4)
if [[ "${loggedInUser}" == "${oldUser}" ]]; then
	echo "Cannot rename active GUI logged in user. Log in with another admin account and try again."
	exit 1
fi

# Query existing user accounts
readonly existingUsers=($(dscl . -list /Users | grep -Ev "^_|com.*|root|nobody|daemon|\/" | cut -d, -f1 | sed 's|CN=||g'))

# Ensure old user account is correct and account exists on system
if [[ ! " ${existingUsers[@]} " =~ " ${oldUser} " ]]; then
	echo "${oldUser} account not present on system to update"
	exit 1
fi

# Ensure new user account is not already in use
if [[ " ${existingUsers[@]} " =~ " ${newUser} " ]]; then
	echo "${newUser} account already present on system. Cannot add duplicate"
	exit 1
fi

# Echo existing usernames

echo "Existing users:" ${existingUsers}

# Query existing home folders
readonly existingHomeFolders=($(ls /Users))

# Ensure existing home folder is not in use
if [[ " ${existingHomeFolders[@]} " =~ " ${newUser} " ]]; then
	echo "${newUser} home folder already in use on system. Cannot add duplicate"
	exit 1
fi

# Checks if user is logged in
loginCheck=$(ps -Ajc | grep ${oldUser} | grep loginwindow | awk '{print $2}')

# Logs out user if they are logged in
timeoutCounter='0'
while [[ "${loginCheck}" ]]; do
	echo "${oldUser} account logged in. Logging user off to complete username update."
	sudo launchctl bootout gui/$(id -u ${oldUser})
	Sleep 5
	loginCheck=$(ps -Ajc | grep ${oldUser} | grep loginwindow | awk '{print $2}')
	timeoutCounter=$((${timeoutCounter} + 1))
	if [[ ${timeoutCounter} -eq 4 ]]; then
		echo "Timeout unable to log out ${oldUser} account."
		exit 1
	fi
done

# Captures current "RealName" this is the displayName
fullRealName=$(dscl . -read /Users/${oldUser} RealName)

# Formats "RealName"
readonly origRealName=$(echo ${fullRealName} | cut -d' ' -f2-)
echo "current RealName: " ${origRealName}

# Captures current NFS home directory
readonly origHomeDir=$(dscl . -read "/Users/${oldUser}" NFSHomeDirectory | awk '{print $2}' -)
echo "current NFS home dir: " ${origHomeDir}