luser-demo03.sh

#!/bin/bash

# Display the UID username of the user executing this script
# Display if the user is the vagrant user or not


# Display the UID
echo "Your UID is ${UID}"

# Only display if the UID does NOT mach 1000.
UID_TO_TEST_FOR='1000'
if [[ "${UID}" -ne "${UID_TO_TEST_FOR}" ]]
then
  echo "Your UID does not match ${UID_TO_TEST_FOR}"
  exit 1
fi

# Display the username
USER_NAME=$(id -un)

# Test if the command succeeded.
if [[ "${?}" -ne 0 ]]
then
  echo `The id command did not execute succesfully.`
  exit 1
fi
echo "Your username is ${USER_NAME}."

# You can use a string test conditional
USER_NAME_TO_TEST_FOR='vagrant'
if [[ "${USER_NAME}" = "${USER_NAME_TO_TEST_FOR}" ]]
then
  echo "Your username matches ${USER_NAME_TO_TEST_FOR}."
fi

# Test for != for the string
if [[ "${USER_NAME}" != "${USER_NAME_TO_TEST_FOR}" ]]
then 
  echo "Your username does not match ${USER_NAME_TO_TEST_FOR}."
  exit 1
fi

exit 0