Shell scripts frequently fail to handle directory names with spaces in them. Example from the linked article: APP_ROOT=`dirname $0`

This is not going to do what you expect if the current script is run via a command with spaces in one of the preceding directories' name.

It should be: APP_ROOT="`dirname "$0"`"

Even this would fail if your immediate parent directory's name ended with a newline character, but should handle any other whitespace without issue.