modeString method
The mode value as a human-readable string.
The string is in the format "rwxrwxrwx", reflecting the user, group, and world permissions to read, write, and execute the file system object, with "-" replacing the letter for missing permissions. Extra permission bits may be represented by prepending "(suid)", "(guid)", and/or "(sticky)" to the mode string.
Implementation
@override
String modeString() => fileStat.modeString();