Using netstat utility in Linux it is possible to see not only opened connections, but also to see which ports are open at current connection.
To do so, type: netstat –nap
use netstat –help for more information.
Using netstat utility in Linux it is possible to see not only opened connections, but also to see which ports are open at current connection.
To do so, type: netstat –nap
use netstat –help for more information.
To check open ports on your Linux system you will need following package: nmap
Debian/Ubuntu got his package in standard repository already for ages.
Installing the nmap.
To have simple check play with your local host IP, usually it’s 127.0.0.1. To do so, type: nmap -sS -O 127.0.0.1
In this example it’s clear which port are open:
22/tcp open ssh
139/tcp open netbios-ssn
445/tcp open microsoft-ds
3306/tcp open mysql
10000/tcp open snet-sensor-mgmt
The information about what you typed is continuously stored in most Linux distributions. If it is BASH than it stored in .bash_history file in your current user folder.
The easiest way to delete the history is to type the following command:
history –c
All records from the file .bash_history will disappear.
There are many files could be stored in /tmp folder which are needed by running software on your Linux system. Removing them could cause you data loss.
However there is a safe way to do this.
Use the following command:
TMPTIME=0
This will remove all files from tmp folder.
However there is more elegant solution, but possible less stable. Use TMPFS for /tmp folder. That means that everytime you reboot, you get clean /tmp folder, as all file are stored in RAM of your system.
To see how setup TMPFS follow this link: TMPFS