1, 使用 lsof 命令行列出所有打開的文件
# lsof
這可是一個很長的列表，包括打開的文件和網絡
上述屏幕截圖中包含很多列，例如 PID、user、FD 和 TYPE 等等。
FD - File descriptor
FD 列包含這樣一些值
cwd - Current working directory txt - Text file mem - Memory Mapped file mmap - Memory Mapped device Number - It represent the actual file descriptor. For example, 0u, 1w and 3r
r 是讀的意思，w 是寫，u 代表讀寫
Type 代表文件類型，例如：
>REG - Regular file >DIR - Directory >CHR - Character special file >FIFO - First in first out
2, 列出某個用戶打開的文件
# lsof -u user_name
Example:
# lsof -u crybit COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME sshd 29609 crybit cwd DIR 144,233 4096 117711421 / sshd 29609 crybit rtd DIR 144,233 4096 117711421 / sshd 29609 crybit txt REG 144,233 409488 119020186 /usr/sbin/sshd sshd 29609 crybit mem REG 144,241 2443001619 (deleted)/dev/zero (stat: No such file or directory) sshd 29609 crybit mem REG 8,37 119021850 /lib64/libnss_dns-2.5.so (path dev=144,233) sshd 29609 crybit mem REG 8,37 119021984 /lib64/security/pam_succeed_if.so (path dev=144,233) sshd 29609 crybit mem REG 8,37 119022000 /lib64/security/pam_limits.so (path dev=144,233) sshd 29609 crybit mem REG 8,37 119021960 /lib64/security/pam_keyinit.so (path dev=144,233) sshd 29609 crybit mem REG 8,37 119021972 /lib64/security/pam_cracklib.so (path dev=144,233) sshd 29609 crybit mem REG 8,37 119021987 /lib64/security/pam_nologin.so (path dev=144,233) sshd 29609 crybit mem REG 8,37 119021988 /lib64/security/pam_deny.so (path dev=144,233) sshd 29609 crybit mem REG 8,37 119019223 /usr/lib64/libcrack.so.2.8.0 (path dev=144,233) ..... .....
3, 列出在某個端口運行的進程
# lsof -i :port_number
Example:
# lsof -i :22 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME sshd 769 root 3u IPv6 2281738844 0t0 TCP *:ssh (LISTEN) sshd 769 root 4u IPv4 2281738846 0t0 TCP *:ssh (LISTEN)
# lsof -i :3306 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME mysqld 11106 mysql 10u IPv4 2340975114 0t0 TCP *:mysql (LISTEN)
4, 只列出使用 IPv4 的打開文件
# lsof -i 4 - For IPv4
Example:
# lsof -i 4 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME sshd 769 root 4u IPv4 2281738846 0t0 TCP *:ssh (LISTEN) named 8362 named 20u IPv4 2334751017 0t0 TCP localhost.localdomain:domain (LISTEN) named 8362 named 21u IPv4 2334751019 0t0 TCP crybit.com:domain (LISTEN) named 8362 named 22u IPv4 2334751021 0t0 TCP localhost.localdomain:rndc (LISTEN) named 8362 named 512u IPv4 2334751016 0t0 UDP localhost.localdomain:domain named 8362 named 513u IPv4 2334751018 0t0 UDP crybit.com:domain tcpserver 9975 root 3u IPv4 2335487959 0t0 TCP *:pop3 (LISTEN) tcpserver 9978 root 3u IPv4 2335487967 0t0 TCP *:pop3s (LISTEN) tcpserver 9983 root 3u IPv4 2335487997 0t0 TCP *:imap (LISTEN) tcpserver 9987 root 3u IPv4 2335488014 0t0 TCP *:imaps (LISTEN) xinetd 10413 root 5u IPv4 2336070983 0t0 TCP *:ftp (LISTEN) xinetd 10413 root 6u IPv4 2336070984 0t0 TCP *:smtp (LISTEN) mysqld 11106 mysql 10u IPv4 2340975114 0t0 TCP *:mysql (LISTEN)
# lsof -i 6
Example:
# lsof -i 6 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME sshd 769 root 3u IPv6 2281738844 0t0 TCP *:ssh (LISTEN) named 8362 named 23u IPv6 2334751024 0t0 TCP localhost.localdomain:rndc (LISTEN) httpd 29241 root 4u IPv6 2439777206 0t0 TCP *:http (LISTEN) httpd 29241 root 6u IPv6 2439777211 0t0 TCP *:https (LISTEN) httpd 29243 apache 4u IPv6 2439777206 0t0 TCP *:http (LISTEN) httpd 29243 apache 6u IPv6 2439777211 0t0 TCP *:https (LISTEN) httpd 29244 apache 4u IPv6 2439777206 0t0 TCP *:http (LISTEN) httpd 29244 apache 6u IPv6 2439777211 0t0 TCP *:https (LISTEN) httpd 29245 apache 4u IPv6 2439777206 0t0 TCP *:http (LISTEN) httpd 29245 apache 6u IPv6 2439777211 0t0 TCP *:https (LISTEN) httpd 29246 apache 4u IPv6 2439777206 0t0 TCP *:http (LISTEN)
5, 列出端口在 1-1024 之間的所有進程
# lsof -i :1-1024
Example:
# lsof -i :1-1024 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME sshd 769 root 3u IPv6 2281738844 0t0 TCP *:ssh (LISTEN) sshd 769 root 4u IPv4 2281738846 0t0 TCP *:ssh (LISTEN) named 8362 named 20u IPv4 2334751017 0t0 TCP localhost.localdomain:domain (LISTEN) named 8362 named 21u IPv4 2334751019 0t0 TCP crybit.com:domain (LISTEN) named 8362 named 22u IPv4 2334751021 0t0 TCP localhost.localdomain:rndc (LISTEN) named 8362 named 23u IPv6 2334751024 0t0 TCP localhost.localdomain:rndc (LISTEN) tcpserver 9975 root 3u IPv4 2335487959 0t0 TCP *:pop3 (LISTEN) tcpserver 9978 root 3u IPv4 2335487967 0t0 TCP *:pop3s (LISTEN) tcpserver 9983 root 3u IPv4 2335487997 0t0 TCP *:imap (LISTEN) tcpserver 9987 root 3u IPv4 2335488014 0t0 TCP *:imaps (LISTEN) xinetd 10413 root 5u IPv4 2336070983 0t0 TCP *:ftp (LISTEN) xinetd 10413 root 6u IPv4 2336070984 0t0 TCP *:smtp (LISTEN) httpd 29241 root 4u IPv6 2439777206 0t0 TCP *:http (LISTEN) httpd 29241 root 6u IPv6 2439777211 0t0 TCP *:https (LISTEN) httpd 29243 apache 4u IPv6 2439777206 0t0 TCP *:http (LISTEN) .... ....
6, 根據進程id來列出打開的文件
# lsof -p PID
Example:
# lsof -p 11106 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME mysqld 11106 mysql cwd DIR 144,233 4096 119025114 /var/lib/mysql mysqld 11106 mysql rtd DIR 144,233 4096 117711421 / mysqld 11106 mysql txt REG 144,233 9484782 119025094 /usr/libexec/mysqld mysqld 11106 mysql mem REG 8,37 119025094 /usr/libexec/mysqld (path dev=144,233) mysqld 11106 mysql mem REG 8,37 119021850 /lib64/libnss_dns-2.5.so (path dev=144,233) mysqld 11106 mysql mem REG 8,37 119021830 /lib64/libnss_files-2.5.so (path dev=144,233) mysqld 11106 mysql mem REG 8,37 119021841 /lib64/libsepol.so.1 (path dev=144,233) mysqld 11106 mysql mem REG 8,37 119021801 /lib64/libselinux.so.1 (path dev=144,233) mysqld 11106 mysql mem REG 8,37 119021785 /lib64/libresolv-2.5.so (path dev=144,233) mysqld 11106 mysql mem REG 8,37 119021920 /lib64/libkeyutils-1.2.so (path dev=144,233) mysqld 11106 mysql mem REG 8,37 119017006 /usr/lib64/libkrb5support.so.0.1 (path dev=144,233) .... ....
7, 殺掉某個用戶的所有活動進程
# killall -9 `lsof -t -u username`
8, 列出某個目錄中被打開的文件
# lsof +D path_of_the_directory
Example:
# lsof +D /var/log/ COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME syslogd 9729 root 1w REG 144,233 0 119019158 /var/log/kernel syslogd 9729 root 2w REG 144,233 350722 119021699 /var/log/messages syslogd 9729 root 3w REG 144,233 591577 119019159 /var/log/secure syslogd 9729 root 4w REG 144,233 591577 119019159 /var/log/secure
9, 根據進程名稱列出打開的文件
# lsof -c process_name
Example:
# lsof -c ssh COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME sshd 483 root cwd DIR 8,9 4096 2 / sshd 483 root rtd DIR 8,9 4096 2 / sshd 483 root txt REG 8,9 523488 1193409 /usr/sbin/sshd
10, 列出所有網絡連接
# lsof -i
該命令列出所有偵聽和已建立的網絡連接
Example:
# lsof -i COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME sshd 769 root 3u IPv6 2281738844 0t0 TCP *:ssh (LISTEN) sshd 769 root 4u IPv4 2281738846 0t0 TCP *:ssh (LISTEN) named 8362 named 20u IPv4 2334751017 0t0 TCP localhost.localdomain:domain (LISTEN) named 8362 named 21u IPv4 2334751019 0t0 TCP crybit.com:domain (LISTEN) named 8362 named 22u IPv4 2334751021 0t0 TCP localhost.localdomain:rndc (LISTEN) named 8362 named 23u IPv6 2334751024 0t0 TCP localhost.localdomain:rndc (LISTEN) named 8362 named 512u IPv4 2334751016 0t0 UDP localhost.localdomain:domain
就這些！
