Lsof

Internal

• Linux

Overview

lsof lists information about files opened by processes. lsof provides information about:

• regular files
• directories
• block special files
• character special files
• executing text references
• libraries
• streams
• network files (Internet socket, NFS file or UNIX domain socket)

In absence of any options, lsof lists all open files by all processes.

To list open files by a specific process, use the process' PID as follows:

lsof -p <pid>

The output is similar to:

COMMAND   PID    USER   FD   TYPE             DEVICE SIZE/OFF    NODE NAME
java    10016 vagrant  cwd    DIR              252,2     4096 2621584 /home/test
java    10016 vagrant  rtd    DIR              252,0     4096       2 /
java    10016 vagrant  txt    REG              252,2     7734 2885001 /opt/java/x64/jre1.8.0_51/bin/java
java    10016 vagrant  mem    REG              252,0   161704 1310723 /lib64/ld-2.12.so
[...]
java    10016 vagrant    0r   CHR                1,3      0t0      26 /dev/null
java    10016 vagrant    1u   CHR              136,0      0t0       3 /dev/pts/0 (deleted)
java    10016 vagrant    2u   CHR              136,0      0t0       3 /dev/pts/0 (deleted)
java    10016 vagrant    3w   REG              252,2    48759 2753619 /home/test/gc.log.0.current
java    10016 vagrant    4r   REG              252,2 65944582 2884909 /opt/java/x64/jre1.8.0_51/lib/rt.jar
java    10016 vagrant    5u  IPv4              39331      0t0     TCP *:msgsrvr (LISTEN)
[...]

File Descriptor Information

The command provides file descriptor information by default, as the fourth field "FD"