The strLib.booleanAsString() system function returns the string "true" or the string "false" based on a Boolean value.
strLib.booleanAsString(value BOOLEAN in)
returns (result STRING)
updateFlag BOOLEAN;
result STRING;
result = strLib.booleanAsString(updateFlag);
writeStdOut("File updated? " :: result);
// console displays: "File updated? false"