"Linux" common commands lsof viewing open files

The Linux system abstracts the hardware and software into files, so the files can be traced to a lot of important information, such as the read configuration file, open port and so on.

The following are common uses:

The default test file is named Text.txt

1, shows the process of opening text.txt:

Lsof Text.txt

2, shows the process that occupies a port:

Lsof-i: 80

3, displays a process (process name) Open file:

Lsof-c Process_name

4, display a process number (PID) Open file:

Lsof-p Pid_number

5, displays a file opened by a user:

Lsof-u user_name

The default output field is interpreted as:

[Groot] $lsof-U Groot
COMMAND PID USER FD TYPE DEVICE size/off NODE NAME

COMMAND: Process name (only the first 9 characters are taken by default);

pid:process identification number;

User:the user ID number or login name of the user to whom the process belongs;

Fd:file Descriptor number or

CWD Current working directory;

LTX Shared library text (code and data);

Mem memory-mapped file;

Mmap memory-mapped device;

PD parent Directory;

RTD root directory;

TXT program text (Code and data);

Type:is the type of the node associated with the file-e.g, Gdir, GREG, VDIR, VREG, etc.

"Linux" common commands lsof viewing open files