The Linux Operating System is filled with several commands which any aspiring Linux expert or power user e.g. system admin must have a good grasp of. One of such commands is uptime and today, I’ll briefly discuss its purpose and syntax. Uptime is a command that returns information about how long your system has been running together with the current …
What is a port A port is a communication endpoint. At the software level, within an operating system, a port is a logical construct that identifies a specific process or a type of network service. A port is identified for each transport protocol and address combination by a 16-bit unsigned number, known as the port number. The most common transport protocols that use port numbers …
A TCP/IP network connection may be either blocked, dropped, open, or filtered. These actions are generally controlled by the IPtables firewall the system uses and is independent of any process or program that may be listening on a network port. Beyond the firewall, a program or process (a server or daemon) may be listening on …
NTP stands for Network Time Protocol is an internet protocol, which is used to synchronize the system clock between computers. Please note that you must have NTP installed on the system to enable automatic time synchronization with NTP servers. Configuring NTP : Use the set-ntp argument to enable or disable automatic synchronization of your system clock with a remote server …
Read more “Sync Linux System Clock with a Remote NTP Server”
A time zone is a geographic region that has the same standard time. Typically the time zone is set during the installation of the operational system, but it can be easily changed at a later time. Using the correct time zone is essential for many systems related tasks and processes. For example, the cron daemon …
To have the correct time and date in Linux is very important, a lot of things depends on it. It does not matter if you are using Linux to power your personal computer or you have a Linux server. The server and system clock needs to be on time. Linux check date from command line …
What is the inode? Inode is a data structure in a Unix-style filesystem that describes a file-system object such as a file or a directory. It may contain metadata information like file access time, permissions, etc. Each filesystem or partition has its own set of inodes. To uniquely identify a file, you need both the …
Help command : On Unix-like operating system shells, the help command displays information about builtin commands. Help displays brief summaries of shell built-in commands. If PATTERN is specified, gives detailed help on all commands matching PATTERN, otherwise the list of help topics is printed. Syntax help [-dms] [PATTERN …] Options d – Output short description …
Linux File Permissions Every file and directory on your Unix/Linux system is assigned 3 types of owner, given below. Owner is the usually the creator of the files/folders. In Linux, files or folders that you created in your Home directory are usually owned by you, unless you specifically change the ownership. Group contains a group …
This is introduction to some common Linux commands is for you. These commands are the ones that Linux system administrators use frequently # ls – lists directory contents The ls command – the list command – functions in the Linux Terminal to show all of the major directories filed under a given file system. For example, the command: …