Fix all shellcheck warnings

examples/docker-compose/notebook/build.sh

@@ -5,6 +5,7 @@
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 
 # Setup environment
+# shellcheck disable=SC1091
 source "$DIR/env.sh"
 
 # Build the notebook image

examples/docker-compose/notebook/down.sh

@@ -5,6 +5,7 @@
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 
 # Setup environment
+# shellcheck disable=SC1091
 source "$DIR/env.sh"
 
 # Bring down the notebook container, using container name as project name

examples/docker-compose/notebook/env.sh

@@ -10,7 +10,7 @@
 export NAME
 
 # Exposed container port
-: ${PORT:=80}
+: "${PORT:=80}"
 export PORT
 
 # Container work volume name

examples/docker-compose/notebook/up.sh

@@ -58,6 +58,7 @@ else
 fi
 
 # Setup environment
+# shellcheck disable=SC1091
 source "$DIR/env.sh"
 
 # Create a Docker volume to store notebooks