You may have noted that often when you create an account on some website, you are provided with a random password. How can we generate this random data (or passwords in our case) on Linux? This can be done in a [...]
Parted Command To Create Partition Larger Than 2TB In Linux
Parted is a GNU utility and is used to create, manipulate and delete the hard disk partitions. You can even clone partitions. There are other utilities available in Linux, such as fdisk, for performing disk related operations. But frankly speaking, it is [...]
Linux Iptables To Block Different Attacks
Iptables is a Linux kernel based packet filter firewall. The iptables modules are present in the kernel itself, there is no separate daemon for it. This makes the firewall very fast and effective. The Iptables rules control the incoming and outgoing traffic [...]
9 Linux iostat Command Examples for Performance Monitoring
The iostat command in Linux is used to monitor the system's I/O device loading, by observing the time devices are active in relation to their average transfer rates. The iostat command generates reports that can be used to modify your system's [...]
How To Record / Log Failed Login Attempt In Linux
A system administrator needs to monitor any unusual activities on the system. An unauthorized user may try to access the system by trying out different passwords. A feature in Linux that can be used to monitor these failed login attempts is [...]
Linux Print Command : Usage Of Linux lp Command With Examples
The 'Lp' command is used to print files on Unix and Linux systems. The name 'lp' stands for 'line printer'. Normal users are allowed to have direct access to the printer. Users have to spool a job in a print [...]
Linux /proc Directory and Useful Outputs Explained
The linux /proc filesystem was developed to provide information about the processes in a system. But many elements of the filesystem are used by the kernel to get information and also to enable dynamic runtime configuration. The /proc filesystem contains [...]
How to Set Ethernet Speed/Duplex Mode in Linux
By default, NICs used in Linux negotiate their speed and duplex with the switch through the exchange of Fast Link Pulses (FLP). When speed and duplex are set forcibly, these FLPs are not sent. This results in errors when NIC [...]
How to Check Apache Status and Uptime on CentOS/Ubuntu
Apache is the most popular free and open-source cross-platform web server software widely used in Linux and other Unix operating systems. It is the first web server software to serve more than 100 million websites. It supports a variety of [...]
How to Use lsof Command in Linux
"lsof" stands for List Open Files. It is extremely useful for a system administrator to find out the details about files that have been opened and their respective processes. In Linux, everything is just a file - pipes, directories, inodes, or IP sockets. With [...]
How to Encrypt/Decrypt and Signing using GPG Command in Linux
There is no absolute security on the internet or through a network. Because our equipment is regularly connected to the internet and there is some communication, we need to protect the critical information we exchange. Encryption will be a welcome [...]
Linux Tcp Ports - How To Use Netstat and Iptables For Linux Troubleshooting
It is a well known fact that Linux/Unix systems are mostly used as servers and are often in connection to the internet. In such platforms, access is limited by ports used. The term 'port' means a number access point that [...]
How To Fix if Partition Table Entries not in Disk Order
The suggestion given below can help if your partition table is not in a proper disk order. From linux fdisk (fdsik /dev/), choose the advanced menu (by pressing x, afaik), then choose the entry for correcting partition ordering (press 'm' anytime [...]
How to Use ethtool Command with Examples
The ethtool command is used to display/change Ethernet adapter settings. You can change network card speed, auto-negotiation, wake on LAN setting, duplex mode using this tool in Linux. In this article, I will show you some ethtool command examples that [...]