Unix: Finding Out Which Program Is Using a TCP Port

Practice

To see the list of programs listening on TCP ports, use the following commands.

For FreeBSD:

# sockstat -4

For Linux (Debian, CentOS, as well as Ubuntu, RedHat, etc.):

# netstat -nlp

These commands print a list of programs (services) and the ports they're listening on.

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Lectures and tutorial on "LINUX operating system"

Terms: LINUX operating system

1. Introduction

2 - System Boot

3 - Linux Help - man

4 - vim, mc, inittab

5 - the appointment of the main directories

6 - directories / proc, / sys. Block and character file devices

7 - regular files and links.

8 - main properties of objects, chown and chmod commands

9 - umask, additional attributes, lsattr, chattr.

10 Users, groups. Passwd, shadow, group files.

11 Linux users and groups

12 - Linux Processes. nice factor. Ps command

13 Signals in Linux

14 - Processes, tasks. Commands fg, bg, jobs, top, nohup

15 - mount file systems. Mount command

16 - / etc / fstab file

17 - Linux Hard Drives

18 - fdisk command

19 - Linux Modules

20 bash interpreter

21 - the basics of bash programming

22 - bash. Cycles and functions

23 - bash. Team unification

24 - bash work with strings

25 - Manage Demons linux

26 - cron daemon and crontab command

27 - syslog service

28 - Linux X server

29 - Linux authentication. PAM system

30 - udev subsystem

31 - Installing programs from source codes

32 Compiler gcc and g ++ for programming in the C language: running code

Unix shell, server technology job interview questions

Unix Mini Cheat Sheet

Linux file system directories

Incron: Scheduling File System Event Handling

Recovery Mode ubuntu - how use?

SWAP UBUNTU setting in file

How to send the contents of a file or its part to the mail from the bash console

Configuring Linux Time Zone

Grouped linux command list Users, files, installation, search, archived and compressed, LAN-WAN

Configuring Linux Networking from the Command Line and GUI

Creating and maintaining a software RAID array in Linux - mdadm

Ubuntu (linux) how to stop the process (kill)? used signals to stop applications

Task and Process Queue Management Systems: Cron, Supervisor, Redis

Updating an Ubuntu Server with sudo apt update, sudo apt upgrade

Temporary failure in name resolution on Ubuntu 20: DNS Issues

Debian: dpkg -i and Automatic Dependency Resolution

Mounting a Windows Shared Folder (SMB Share) in Linux

How to Extract Specific Folders or Files from a tar Archive

How to Find a Disk's UUID in Linux

Installing Xen 4.2 on Debian Squeeze

How to Disable the Firewall (iptables) on CentOS or Red Hat Linux

Debian: Installing a RAID CLI Console on an Intel Server for LSI RAID Fusion MPT

How to Remove an IP Address from a Network Interface in Linux

iptables, DNAT, and How to Reach the Server from Inside Its Own Network

A Mini Cheat Sheet for vi: How to Use It

nslookup: command not found — Where to Get It and How to Install It on Linux

How to Check Network Card Speed and Duplex Mode in Linux

Connecting an Ext3 or Ext2 Disk to Windows

Linux: "umount: Device or resource busy" — How to Force Unmount a Disk

WinSCP: Slow Performance During File Copying

Linux: Autostarting Commands in bash at Login

Unix: How to Find, Delete, or Copy Files Older or Newer Than a Given Time

[+1] Stopped, or How to Bring a Program Back

PuTTY: Working with the Clipboard (Including Inside MC / Midnight Commander)

Console and SSH Complain About the RSA Host Key After Changing Servers or Reinstalling the OS

Debian: Installing Packages and Resolving Dependencies Automatically via apt

Debian / Ubuntu: Searching for Packages and Package Information with apt and aptitude

Debian / Ubuntu / Kubuntu: How to Check the GUI Color Depth

Xen and HVM: Resolution Limited to 800x600 on a Debian (Gnome) HVM Guest with X11

Where Is the IPTABLES Configuration File Located (Default Path)?

Error: "dpkg-source: command not found"

IPTABLES and a Transparent Proxy, or Redirecting Traffic to Another Port

Limiting Bandwidth with Squid (Delay Pools)

Redirecting "2>&1", ">/dev/null", and Output Streams in Unix (bash/sh)

Turning Off Cron (crontab) Email Notifications for stdout and stderr

Debian: Using aptitude (apt-get) Through a Proxy Server

Error: "... must be owned by root and not group or world-writable"

How to View Numeric chmod Permissions for Files and Directories (Like ls with Numeric Codes)

Unix: Aliases for Frequently Used Commands in bash/sh

Unix: File Synchronization or Backup via Rsync (FreeBSD, Debian, CentOS)

sudo: error "sorry, you must have a tty to run sudo"

Xen: How to Boot a Paravirtualized Machine into Single Mode (Linux Debian, CentOS, RedHat)

Xen: Checking the Hardware (Devices) of a Virtual Machine Host (System Configuration)

bash/sh: Finding the Length of a Variable (String) in a Shell Script (bash or sh)

Debian Squeeze: Software RAID-1 Mirror and grub - System Won't Boot from the Second System Disk

Debian/Ubuntu: How to Disable the Switch to Winter (Standard) Time

Where to Get phpize (phpize: command not found) - for Debian, CentOS, Ubuntu or RedHat

SSH: Restricting Access to a Computer (Server) via SSH

Working with tar on Unix (FreeBSD, Debian, CentOS)

sh/bash: A Script for Rotating Backups or Files (Backup with Rotation)

Mounting an NTFS Disk in Linux with Russian (Cyrillic) File or Directory Names

Unix: Converting Files from One Encoding to Another (on Linux and FreeBSD)

Debian - error "locale: Cannot set LC_CTYPE to default locale: No such file or directory"

Working with gz, gzip, or tar.gz Archives

Working with bz2 or tar.bz2 Archives

Converting and Installing RPM Packages as DEB on Linux Debian

How to Change the SSH Port Number (Daemon or Server) in Linux or FreeBSD

Mounting .iso CD Images in Linux (Debian, CentOS, Ubuntu, RHEL)

How to Check Uptime (Time Since Last Boot) in Linux (Debian, CentOS) or FreeBSD

Where to Specify DNS Servers in Unix (Linux, FreeBSD)

sudo - Running as Administrator in Unix (Executing Commands as root in Linux and FreeBSD), the sudoers File

Installing, Removing, and Listing Programs (Packages) in Debian or Ubuntu. Package Management. GPG Keys.

What to Use to Connect via SSH from Windows (Which Utility)

Installing the ProFTPd FTP Server on Linux Debian (or Ubuntu)

Forcibly Ending a User's Session (Kicking or Logging Out a User) in Linux/FreeBSD

How to Change the Language (Locale) in Linux Debian (or Ubuntu)

How to See Who Is Currently Logged In on Linux/BSD and Where This Is Logged

Installing a Paravirtualized Debian Squeeze (Without HVM)

Accurate Time in Debian (NTP)

Xen and Squeeze: the TAP Interface Doesn't Work

Upgrading Debian Lenny to Squeeze

Recursive chmod and chown for Files or Directories Only

Paravirtualized Linux Won't Start: Hangs at the Line XENBUS: Waiting for devices to initialise

Paravirtualized Debian Only Boots Up to the Message "Starting local scripts"

Converting Debian Squeeze to PV Xen (or Installing PV Debian)

Linux Password Files

Xen: Internal Dummy Virtual Network in Debian

Building .deb Packages from Source (Debian)

Installing Xen 4 on Debian Squeeze

Disabling or Configuring Automatic Filesystem Checks in Debian or Ubuntu

Adding a Second HDD in Debian and Ubuntu

Date, Time, and Time Zone in Debian and Ubuntu

Backports in Debian

Installing VMware Server on Debian Lenny

Unix: Finding Out Which Program Is Using a TCP Port

Installing Xen 4 on Debian Lenny

Installing Debian Lenny PV (Paravirtualized) under Xen

Bash/sh: Reading a Specific Line from a Text File (by Line Number)

bash/sh: Progress Bar While a Script or Command Runs ("Please Wait" Animation)

bash/sh: How to Determine the Number of Days in the Current Month in a Script

bash/sh: sed and the Newline Character \n

bash/sh: Replacing Characters or Substrings in a String in Shell Scripts

Reverse GREP: removing lines that contain specific text

Variables - environment, shell, and dynamic bash/sh: creating and using them in shell scripts

bash/sh: special variables (exit code, pid, startup parameters, etc.)

bash/sh: extracting a substring bounded by given characters (a delimiter) from a string in scripts

bash/sh: if conditional statements and their structure (equality/inequality, greater than and less than, etc.)

FreeBSD: Installing a Samba file server in a Windows domain (Active Directory)

How to check the version and name of your Linux distribution

bash/sh: Reading a file line by line in a shell script

Samba: warning "rlimit_max: rlimit_max (1024) below minimum Windows limit (16384)"

Running a shell script as a background process

Installing EPEL on CentOS 5 (RedHat)

Installing an SSL certificate for Apache from Let's Encrypt

Squid not listening on any port

Garbled characters (mojibake) in Midnight Commander (mc)

Recursively renaming file extensions in Ubuntu

cp: cannot create regular file '/media/user/backup/backup_2018-03-26_01:46.tar.gz': Invalid argument

Ubuntu Software not working correctly [solved]