#______________________________________________________________________
# isURI <string>
-# Returns 0 (true) if the supplied string is a HTTP/FTP URL, otherwise 1
+# Returns 0 (true) if the supplied string is a HTTP/HTTPS/FTP/FILE
+# URL, otherwise 1
isURI() {
case "$1" in
- http:*|ftp:*|HTTP:*|FTP:*|file:*|FILE:*) return 0;;
+ [hH][tT][tT][pP]:*) return 0;;
+ [hH][tT][tT][pP][sS]:*) return 0;;
+ [fF][tT][pP]:*) return 0;;
+ [fF][iI][lL][eE]:*) return 0;;
*) return 1;
esac
}