hi
i red the "closed" thred and innately nosy and want to know where it comes from. here are my awareness.
What is .goutputstream? - ubuntu general help

5234749 -rw------- 1 richi richi 154 Apr 8 22:15 .goutputstream-PBOIVW
contens shown by: xxd
richi@tschang:~ 15:52-> xxd .goutputstream-PBOIVW
0000000: 0000 0004 c195 2001 0001 3100 124d 4954 ...... ...1..MIT
0000010: 2d4d 4147 4943 2d43 4f4f 4b49 452d 3100 -MAGIC-COOKIE-1.
0000020: 1095 854f 55c5 0aae 2245 4a65 f72e 66e6 ...OU..."EJe..f.
0000030: 2101 0000 0774 7363 6861 6e67 0001 3100 !....tschang..1.
0000040: 124d 4954 2d4d 4147 4943 2d43 4f4f 4b49 .MIT-MAGIC-COOKI
0000050: 452d 3100 1095 854f 55c5 0aae 2245 4a65 E-1....OU..."EJe
0000060: f72e 66e6 2101 0000 0774 7363 6861 6e67 ..f.!....tschang
0000070: 0002 3130 0012 4d49 542d 4d41 4749 432d ..10..MIT-MAGIC-
0000080: 434f 4f4b 4945 2d31 0010 cf07 8fa4 c62b COOKIE-1.......+
0000090: 29b8 9cf9 1d46 8c25 2cf0 )....F.%,.

and here are the files coming from:
the file is writen when the system is stoped (shutdown). looks like it comes from X or
lightdm - i guess it has something to do with the GUI (see the xxd contens of the
file before).
i just try it and the result is:
5234760 -rw------- 1 richi richi 154 Apr 9 16:00 .goutputstream-9HN8UW

for people like to guess: when do i shutdown my system yesterday ? )
ciao