??????????????
?????????????????????????Щ????????????
????????????????????inode??????? inode??????????????????????? ??????????????? ???????(????洢????????Щ???????). ???????(rm)???????? ???????????inode??????? ????????inode??????. ?????????????. ??е?inode?????????????????? ?????Щ????齫????д???μ?????.
????proc?????????Э????????????. ??????????????/proc????????????????????? ????????????fd(?????????)????(??????????????????????). ??????????????????????? ??????????inode?????? ??/proc/?????/fd/?????????
???????????????????????(pid)???????????(fd). ??Щ?????????lsof?????????? lsof???????”list open files?? ?г?(????)???????”. ??????????/proc??????????????????.
????1.??????????????????????￡???????????
????touch testfile
????cp testfile testfile.backup.2014
????2.?????????????
????stat testfile
????File: 'testfile'
????Size: 343545 Blocks: 241 IO Block: 4096 regular file
????Device: fd00h/64768d Inode: 361579 Links: 1
????Access: (0664/-rw-rw-r–) Uid: ( 505/ zhaoke) Gid: ( 505/ zhaoke)
????Access: 2014-11-09 15:00:38.000000000 +0800
????Modify: 2014-11-09 15:00:34.000000000 +0800
????Change: 2014-04-09 15:00:34.000000000 +0800
????3.??????
????rm testfile
????4.?????
????ls -l testfile
????ls: testfile: No such file or directory
????stat testfile
????stat: cannot stat 'testfile': No such file or directory
????testfile????????????????????????????????? ??????????? ???????????.
??????????????????????????????lsof???????
????lsof | grep testfile
????tail 5317 root 4r REG 253??0 343545  361579  /root/testfile (deleted)
???????????????????????(??????)?? ?????????????(PID)?? ???????????????????
?????????????5317???????д?????? ???????????4. ??????????/proc???濽????????.
???????????????cp -a?? ??????????????? ???????????????????????????
????ls -l /proc/5317/fd/4
????lr-x—— 1 root root 64  09 15:00 /proc/5317/fd/4 -> /root/testfile (deleted)
???????cp -a?????????
????cp -a /proc/5317/fd/4 testfile.backup
???????ls????????
????ls -l testfile.backup
????lrwxrwxrwx 1 root root 29  09 15:02 testfile.backup -> /roor/testfile (deleted)
???????????????????????????cp -a?????????????????????????????????
???????file?????????????????????
????1.?????
????file testfile.backup
????testfile.backup: broken symbolic link to '/root/testfile (deleted)'
????2.???????????
????file /proc/5317/fd/4
????/proc/5317/fd/4: broken symbolic link to '/root/myfile (deleted)'
?????????????file????????????cp???????????????????????????У?????:
????cp /proc/5317/fd/4 testfile.new
?????????????????????????????????????????????????????????????:
????ls -l testfile.new
??????????????????????
????diff testfile.new myfile.backup
????4??lsof???Щ?????÷?
????1????????
root@localhost:~# lsof -i :80
COMMAND     PID     USER   FD   TYPE    DEVICE SIZE/OFF NODE NAME
AliYunDun  1996     root   11u  IPv4 117919702      0t0  TCP 124.46.185.34:42372->140.205.140.205:http (ESTABLISHED)
aegis_qua  2114     root   11u  IPv4     14868      0t0  TCP 124.46.185.34:43077->42.156.166.25:http (CLOSE_WAIT)
nginx     13706 www-data    5u  IPv4 140102705      0t0  TCP 124.46.185.34:http->140.205.127.64:41851 (ESTABLISHED)
nginx     13706 www-data   15u  IPv4   6150826      0t0  TCP *:http (LISTEN)
nginx     13706 www-data   35u  IPv4 140096235      0t0  TCP 124.46.185.34:http->198.11.137.21:47450 (ESTABLISHED)
nginx     13706 www-data   36u  IPv4 140095680      0t0  TCP 124.46.185.34:http->140.205.127.52:39887 (ESTABLISHED)
nginx     13706 www-data   39u  IPv4 140102712      0t0  TCP 124.46.185.34:http->198.11.137.5:37626 (ESTABLISHED)
nginx     13706 www-data   40u  IPv4 140102699      0t0  TCP 124.46.185.34:http->140.205.127.11:36374 (ESTABLISHED)
nginx     13706 www-data   41u  IPv4 140102759      0t0  TCP 124.46.185.34:http->101.200.101.217:47550 (ESTABLISHED)
nginx     13706 www-data   42u  IPv4 140102722      0t0  TCP 124.46.185.34:http->101.200.101.201:38595 (ESTABLISHED)
nginx     13706 www-data   43u  IPv4 140102840      0t0  TCP 124.46.185.34:http->140.205.127.58:45859 (ESTABLISHED)
nginx     13706 www-data   44u  IPv4 140095709      0t0  TCP 124.46.185.34:http->101.200.101.216:44828 (ESTABLISHED)
nginx     13706 www-data   46u  IPv4 140070070      0t0  TCP 124.46.185.34:http->140.205.127.18:24113 (ESTABLISHED)
nginx     13706 www-data   47u  IPv4 140103294      0t0  TCP 124.46.185.34:http->198.11.137.61:43262 (ESTABLISHED)
nginx     13706 www-data   48u  IPv4 140102761      0t0  TCP 124.46.185.34:http->101.200.101.220:31912 (ESTABLISHED)
nginx     13706 www-data   50u  IPv4 140103297      0t0  TCP 124.46.185.34:http->101.200.101.203:42752 (ESTABLISHED)
nginx     13706 www-data   52u  IPv4 140095824      0t0  TCP 124.46.185.34:http->198.11.137.14:62968 (ESTABLISHED)
nginx     13706 www-data   53u  IPv4 140102730      0t0  TCP 124.46.185.34:http->101.200.101.205:27518 (ESTABLISHED)
nginx     13706 www-data   54u  IPv4 140102822      0t0  TCP 124.46.185.34:http->140.205.127.51:58945 (ESTABLISHED)
nginx     13706 www-data   55u  IPv4 140103313      0t0  TCP 124.46.185.34:http->140.205.127.15:20785 (ESTABLISHED)
nginx     13706 www-data   56u  IPv4 140102812      0t0  TCP 124.46.185.34:http->140.205.31.212:1963 (ESTABLISHED)
nginx     13706 www-data   57u  IPv4 140102929      0t0  TCP 124.46.185.34:http->101.200.101.213:42452 (ESTABLISHED)
nginx     13706 www-data   58u  IPv4 140095749      0t0  TCP 124.46.185.34:http->101.200.101.208:50444 (ESTABLISHED)
nginx     13706 www-data   59u  IPv4 140102769      0t0  TCP 124.46.185.34:http->140.205.127.60:59679 (ESTABLISHED)
nginx     13706 www-data   60u  IPv4 140102814      0t0  TCP 124.46.185.34:http->140.205.127.2:25156 (ESTABLISHED)
nginx     13706 www-data   61u  IPv4 140102771      0t0  TCP 124.46.185.34:http->198.11.137.53:16935 (ESTABLISHED)
nginx     13706 www-data   62u  IPv4 140102845      0t0  TCP 124.46.185.34:http->198.11.137.2:50535 (ESTABLISHED)
nginx     13706 www-data   63u  IPv4 140102773      0t0  TCP 124.46.185.34:http->198.11.137.52:8521 (ESTABLISHED)
nginx     13706 www-data   64u  IPv4 140102856      0t0  TCP 124.46.185.34:http->140.205.127.23:55360 (ESTABLISHED)
nginx     13706 www-data   66u  IPv4 140075271      0t0  TCP 124.46.185.34:http->140.205.127.48:64726 (ESTABLISHED)
nginx     13706 www-data   67u  IPv4 140102937      0t0  TCP 124.46.185.34:http->101.200.101.204:10400 (ESTABLISHED)
nginx     13706 www-data   68u  IPv4 140102932      0t0  TCP 124.46.185.34:http->101.200.101.213:42455 (ESTABLISHED)
nginx     13706 www-data   69u  IPv4 140102941      0t0  TCP 124.46.185.34:http->140.205.127.24:31585 (ESTABLISHED)
nginx     13706 www-data   70u  IPv4 140102934      0t0  TCP 124.46.185.34:http->198.11.137.50:11837 (ESTABLISHED)
nginx     13706 www-data   71u  IPv4 140103309      0t0  TCP 124.46.185.34:http->140.205.127.15:20777 (ESTABLISHED)
nginx     13706 www-data   92u  IPv4 140070742      0t0  TCP 124.46.185.34:http->140.205.127.31:65012 (ESTABLISHED)
nginx     13707 www-data    5u  IPv4 140092233      0t0  TCP 124.46.185.34:http->140.205.127.60:57698 (ESTABLISHED)
nginx     13707 www-data   15u  IPv4   6150826      0t0  TCP *:http (LISTEN)
nginx     13707 www-data   17u  IPv4 140092036      0t0  TCP 124.46.185.34:http->140.205.127.51:54339 (ESTABLISHED)
nginx     13707 www-data   30u  IPv4 140092031      0t0  TCP 124.46.185.34:http->198.11.137.59:64831 (ESTABLISHED)
nginx     13707 www-data   35u  IPv4 140092214      0t0  TCP 124.46.185.34:http->140.205.31.213:40510 (ESTABLISHED)
nginx     13707 www-data   39u  IPv4 140092202      0t0  TCP 124.46.185.34:http->140.205.127.9:19592 (ESTABLISHED)
nginx     13707 www-data   44u  IPv4 140092205      0t0  TCP 124.46.185.34:http->140.205.127.7:24059 (ESTABLISHED)
nginx     13707 www-data   46u  IPv4 140103741      0t0  TCP 124.46.185.34:http->198.11.137.22:61619 (ESTABLISHED)
nginx     13707 www-data   51u  IPv4 140072557      0t0  TCP 124.46.185.34:http->140.205.127.50:51697 (ESTABLISHED)
nginx     13707 www-data   61u  IPv4 140056450      0t0  TCP 124.46.185.34:http->140.205.127.37:27131 (ESTABLISHED)
nginx     13707 www-data   69u  IPv4 140072632      0t0  TCP 124.46.185.34:http->140.205.127.13:20352 (ESTABLISHED)
nginx     13708 www-data   15u  IPv4   6150826      0t0  TCP *:http (LISTEN)