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An open file may be a regular file, a directory, a block special file, a character special file, an executing text reference, a library, a stream or a network file (Internet socket, NFS file or UNIX domain socket.) A specific file or all the files in a file system may be selected by path. lsof 4.76 latest FAQ: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/FAQ latest man page: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/lsof_man root@shibu-laptop:~# lsof -i TCP COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME dnsmasq 3855 dnsmasq 4u IPv4 10532 TCP *:domain (LISTEN) dnsmasq 3855 dnsmasq 6u IPv6 10549 TCP *:domain (LISTEN) hpiod 3873 hplip 0u IPv4 10581 TCP localhost:3422 (LISTEN) firefox-b 5148 shibu 42u IPv4 15690 TCP 10.154.58.234:1179->rv-in-f99.google.com:www (ESTABLISHED) firefox-b 5148 shibu 43u IPv4 15823 TCP 10.154.58.234:4955->clusteralt0.msomt.modwest.com:www (ESTABLISHED) firefox-b 5148 shibu 47u IPv4 15791 TCP 10.154.58.234:1030->hk-in-f104.google.com:www (ESTABLISHED) firefox-b 5148 shibu 51u IPv4 15786 TCP 10.154.58.234:3671->72.14.255.104:www (ESTABLISHED) firefox-b 5148 shibu 53u IPv4 15746 TCP 10.154.58.234:2194->www.hostmysite.com:www (ESTABLISHED) firefox-b 5148 shibu 55u IPv4 15794 TCP 10.154.58.234:1031->hk-in-f104.google.com:www (ESTABLISHED) root@shibu-laptop:~# lsof -i UDP COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME dnsmasq 3855 dnsmasq 3u IPv4 10531 UDP *:domain dnsmasq 3855 dnsmasq 5u IPv6 10548 UDP *:domain root@shibu-laptop:~# lsof -p 3855 COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME dnsmasq 3855 dnsmasq cwd DIR 3,4 4096 2 / dnsmasq 3855 dnsmasq rtd DIR 3,4 4096 2 / dnsmasq 3855 dnsmasq txt REG 3,4 96048 610190 /usr/sbin/dnsmasq dnsmasq 3855 dnsmasq mem REG 0,0 0 [heap] (stat: No such file or directory) dnsmasq 3855 dnsmasq mem REG 3,4 38372 1032964 /lib/tls/i686/cmov/libnss_files-2.4.so dnsmasq 3855 dnsmasq mem REG 3,4 34320 1032966 /lib/tls/i686/cmov/libnss_nis-2.4.so dnsmasq 3855 dnsmasq mem REG 3,4 75488 1032961 /lib/tls/i686/cmov/libnsl-2.4.so dnsmasq 3855 dnsmasq mem REG 3,4 30428 1032962 /lib/tls/i686/cmov/libnss_compat-2.4.so dnsmasq 3855 dnsmasq mem REG 3,4 1248904 1032698 /lib/tls/i686/cmov/libc-2.4.so dnsmasq 3855 dnsmasq mem REG 3,4 105112 819226 /lib/ld-2.4.so dnsmasq 3855 dnsmasq 0u unix 0xcebfd480 10555 socket dnsmasq 3855 dnsmasq 3u IPv4 10531 UDP *:domain dnsmasq 3855 dnsmasq 4u IPv4 10532 TCP *:domain (LISTEN) dnsmasq 3855 dnsmasq 5u IPv6 10548 UDP *:domain dnsmasq 3855 dnsmasq 6u IPv6 10549 TCP *:domain (LISTEN) root@shibu-laptop:~# lsof -u root COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME init 1 root cwd DIR 3,4 4096 2 / init 1 root rtd DIR 3,4 4096 2 / init 1 root txt REG 3,4 31432 426047 /sbin/init init 1 root mem REG 0,0 0 [heap] (stat: No such file or directory) init 1 root mem REG 3,4 1248904 1032698 /lib/tls/i686/cmov/libc-2.4.so init 1 root mem REG 3,4 105112 819226 /lib/ld-2.4.so init 1 root 10u FIFO 0,12 6012 /dev/initctl ksoftirqd 2 root cwd DIR 3,4 4096 2 / ksoftirqd 2 root rtd DIR 3,4 4096 2 / ksoftirqd 2 root txt unknown /proc/2/exe watchdog/ 3 root cwd DIR 3,4 4096 2 /
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