Bash -> if/else | while | until

Conditionals.bash

# Simple if/else block
MYVAL=$(some_command)
if [[ $MYVAL -eq 1 ]]
then
    echo "It was one"
elif [[ $MYVAL -eq 2 ]]
then
    echo "It was two"
else
    echo "It was not one"
fi

# Until Loop
# Keep running docker info until it returns a success exit code (0)
docker info &> /dev/null
    until [ $? -eq 0 ]
    do
        sleep 1
        echo "  ..."
        docker info &> /dev/null
    done
    echo "Docker is now running."
else 
    echo "Docker is already running."

# Alternatively, use while
docker info &> /dev/null
    while [ $? -eq 1 ]
    do
        sleep 1
        echo "  ..."
        docker info &> /dev/null
    done
    echo "Docker is now running."
else 
    echo "Docker is already running."