Greetings all,
For a file that is open, but deleted, is there a way to create a new
filename for it given either the file descriptor from the process or
the inode?
Thus far, my Google searches suggest the answer is "no". But I find
that hard to believe.
In the example below, I would like to create a new filename for
/tmp/zfoo.txt, which I have deleted. I have the original filename,
the inode, and the file descriptor from the process. In fact, I can
even create a copy using 'tail'. I was just wondering if I could
create a new filename with that inode number.
$ { while : ; do date ; sleep 1 ; done > /tmp/zfoo.txt ; } &
[1] 29573
$ pid=$(jobs -p)
$ ls -la /tmp/zfoo.txt
-rw-rw-r-- 1 rwcitek rwcitek 29 Nov 13 01:16 /tmp/zfoo.txt
$ ls -i /tmp/zfoo.txt
573463 /tmp/zfoo.txt
$ sleep 5
$ head -3 /tmp/zfoo.txt | cat -n
1 Thu Nov 13 01:16:31 EST 2014
2 Thu Nov 13 01:16:32 EST 2014
3 Thu Nov 13 01:16:33 EST 2014
$ tail -3 /tmp/zfoo.txt | cat -n ; sleep 2 ; echo ; tail -3
/tmp/zfoo.txt | cat -n
1 Thu Nov 13 01:16:33 EST 2014
2 Thu Nov 13 01:16:34 EST 2014
3 Thu Nov 13 01:16:35 EST 2014
1 Thu Nov 13 01:16:35 EST 2014
2 Thu Nov 13 01:16:36 EST 2014
3 Thu Nov 13 01:16:37 EST 2014
$ lsof /tmp/zfoo.txt
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
bash 29573 rwcitek 1w REG 202,2 232 573463 /tmp/zfoo.txt
$ \rm /tmp/zfoo.txt
$ touch /tmp/zfoo.txt
$ ls -la /tmp/zfoo.txt
-rw-rw-r-- 1 rwcitek rwcitek 0 Nov 13 01:16 /tmp/zfoo.txt
$ lsof /tmp/zfoo.txt
$ lsof +L1
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NLINK NODE NAME
bash 29573 rwcitek 1w REG 202,2 232 0 573463
/tmp/zfoo.txt (deleted)
sleep 29604 rwcitek 1w REG 202,2 232 0 573463
/tmp/zfoo.txt (deleted)
$ echo ${pid}
29573
$ head -3 /proc/${pid}/fd/1 | cat -n
1 Thu Nov 13 01:16:31 EST 2014
2 Thu Nov 13 01:16:32 EST 2014
3 Thu Nov 13 01:16:33 EST 2014
$ tail -3 /proc/${pid}/fd/1 | cat -n
1 Thu Nov 13 01:16:36 EST 2014
2 Thu Nov 13 01:16:37 EST 2014
3 Thu Nov 13 01:16:38 EST 2014
$ tail -n +1 -f /proc/${pid}/fd/1 > /tmp/zfoo.new.txt &
Regards,
- Robert
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