lsof list open file

FROM lsof-command-examples

Introduction:
By default One file per line is displayed. Most of the columns are self explanatory. We will explain the details about couple of cryptic columns (FD and TYPE).

FD – Represents the file descriptor. Some of the values of FDs are,

• cwd – Current Working Directory
• txt – Text file
• mem – Memory mapped file
• mmap – Memory mapped device
• NUMBER – Represent the actual file descriptor. The character after the number i.e ‘1u’, represents the mode in which the file is opened. r for read, w for write, u for read and write.

TYPE – Specifies the type of the file. Some of the values of TYPEs are,

• REG – Regular File
• DIR – Directory
• FIFO – First In First Out
• CHR – Character special file