On Friday 12 February 2010 07:20 PM, Suvayu Ali wrote: > On Friday 12 February 2010 05:57 PM, Patrick O'Callaghan wrote: >> On Fri, 2010-02-12 at 16:42 -0800, Suvayu Ali wrote: >>> On Friday 12 February 2010 04:36 PM, Suvayu Ali wrote: >>>> On Friday 12 February 2010 04:07 PM, Patrick O'Callaghan wrote: >>>>> Editors can do funny things with backup files in the interests of >>>>> preserving your work. An easier test would be: >>>>> >>>>> cat> foo& >>>>> rm foo >>>>> lsof +L1 -s >>>>> >>>>> When I do this the "cat" process shows up (and foo is marked as >>>>> deleted). You can then reconnect to "cat" (using fg) and write stuff >>>>> into the "non-existent" file. >>> >>> Another observation I forgot to mention, when I used fg and wrote to the >>> (deleted) file I could also see the size of the file increase. However >>> using `C-z' and fg again gave me back the orginal empty file _without_ >>> the edits. >> >> How do you know it doesn't have the edits if you can't open it? > > So after I resume the edit with fg %1, I can't see what I had input the > last time. Strangely though I see the size is the same (same as after my > first edit). Here is the transcript from my terminal. > >> $ cat > foo & >> [1] 3843 >> >> [1]+ Stopped cat > foo >> $ rm foo >> $ lsof +L1 -s >> COMMAND PID USER FD TYPE DEVICE SIZE NLINK NODE NAME >> cat 3843 jallad 1w REG 253,2 0 0 15032 /home/jallad/foo (deleted) >> $ fg %1 >> cat > foo >> testing deleted files >> ^Z >> [1]+ Stopped cat > foo >> $ lsof +L1 -s >> COMMAND PID USER FD TYPE DEVICE SIZE NLINK NODE NAME >> cat 3843 jallad 1w REG 253,2 22 0 15032 /home/jallad/foo (deleted) >> $ fg %1 >> cat > foo >> ^Z >> [1]+ Stopped cat > foo >> $ lsof +L1 -s >> COMMAND PID USER FD TYPE DEVICE SIZE NLINK NODE NAME >> cat 3843 jallad 1w REG 253,2 22 0 15032 /home/jallad/foo (deleted) Although I can't see it there, as per Roberto's suggestion, I tried looking at the contents using the /proc filesystem. > $ fg %1 > cat > foo > this is the 2nd line > ^Z > [1]+ Stopped cat > foo > $ lsof +L1 -s > COMMAND PID USER FD TYPE DEVICE SIZE NLINK NODE NAME > cat 3843 jallad 1w REG 253,2 43 0 15032 /home/jallad/foo (deleted) > $ cat /proc/3843/fd/1 > testing deleted files > this is the 2nd line So my edits are not exactly lost its simply not shown when I fg it again ;) Even the size of the deleted file increases and includes my newer edits! -- Suvayu Open source is the future. It sets us free. -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
