Example: Replace file-content (uint8[]-based), sync

public static int main (string[] args) {
if (args.length != 2) {
print ("%s FILE\n", args[0]);
return 0;
}

try {
File file = File.new_for_commandline_arg (args[1]);
file.replace_contents ("My info\n".data, null, false, FileCreateFlags.NONE, null);
} catch (Error e) {
print ("Error: %s\n", e.message);
}
return 0;
}

 valac --pkg gio-2.0 GLib.File.replace_contents.vala

See: