Source: nixCraft
For new computer or Laptop or server, I need to collect the information about its hardware. This is also useful when you need to replace a disk or memory with a vendor. In order to replace hardware you need all information in advance. In this post, I’m going to list commands that you can use to collect the hardware information.
All of the following commands are tested on Ubuntu Linux LTS 14.04, but should work with any modern distro too such as Debian or Fedora Linux.
Lire la suite…
Source: nixCraft
How do I find out my public IP address on the Linux and OS X Unix command line to use with my own bash shell script without using third party web site? Is there command-line option which will show my dynamic IP address on a Ubuntu or Fedora Linux?
There are many ways to find out your public IP address or wan (Wide Area Network) IP on a Linux or Unix-like operating systems such as FreeBSD, OpenBSD, NetBSD, Apple OS X, and others.
Explain IP addresses
An IP is short for Internet Protocol. It is used to identify computers or mobile devices on the Internet. Each device connected to the Internet has an IP address. IP address can be used to personalize information.
Lire la suite…
How do I find out running processes were associated with each open port? How do I find out what process has open tcp port 111 or udp port 7000 under Linux?
You can the following programs to find out about port numbers and its associated process:
netstat – a command-line tool that displays network connections, routing tables, and a number of network interface statistics.fuser – a command line tool to identify processes using files or sockets.lsof – a command line tool to list open files under Linux / UNIX to report a list of all open files and the processes that opened them./proc/$pid/ file system – Under Linux /proc includes a directory for each running process (including kernel processes) at /proc/PID, containing information about that process, notably including the processes name that opened port.
You must run above command(s) as the root user. Lire la suite…
Source: nixCraft
I‘m a new Unix system user. How do I use sudo command without a password on a Linux or Unix-like systems?
Some times you may need to run a command with root privileges, but you do not want to type a password using sudo command. This is useful for scripting or any other purpose. This can be achieved by editing /etc/sudoers file and setting up correct entries.
You need to consider any security consequence of allowing a sudo command execute without a password. Lire la suite…
Here is what happens:
$ sudo visudo
>>> /etc/sudoers: syntax error near line 28 <<<
sudo: parse error in /etc/sudoers near line 28
sudo: no valid sudoers sources found, quitting
On a modern Ubuntu system (and many other GNU/Linux distributions), fixing a corrupted sudoers file is actually quite easy, and doesn’t require rebooting, using a live CD, or physical access to the machine.
To do this via SSH, log in to the machine and run the command pkexec visudo. If you have physical access to the machine, SSH is unnecessary; just open a Terminal window and run that pkexec command. Lire la suite…