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System Library: System Library plays a vital role because application
programs access Kernels feature using system library. System Utility: System Utility performs specific and individual level tasks. 25/71 Question: What Is Difference Between Linux & Unix? Unix and Linux are similar in many ways, and in fact, Linux was originally created to be similar to Unix. Both have similar tools for interfacing with the systems, programming tools, filesystem layouts, and other key components. However, Unix is not free. Over the years, a number of different operating systems have been created that attempted to be “unix-like” or “unix-compatible,” but Linux has been the most successful, far surpassing its predecessors in popularity. Question: What Is BASH? BASH stands for Bourne Again Shell. BASH is the UNIX shell for the GNU operating system. So, BASH is the command language interpreter that helps you to enter your input, and thus you can retrieve information. In a straightforward language, BASH is a program that will understand the data entered by the user and execute the command and gives output. Question: What Is CronTab? The crontab (short for "cron table") is a list of commands that are scheduled to run at regular time intervals on computer system. The crontab command opens the crontab for editing, and lets you add, remove, or modify scheduled tasks. The daemon which reads the crontab and executes the commands at the right time is called cron. It's named after Kronos, the Greek god of time. Command syntax crontab [-u user] file crontab [-u user] [-l | -r | -e] [-i] [-s] Question: What Is Daemon In Linux? A daemon is a type of program on Linux operating systems that runs unobtrusively in the background, rather than under the direct control of a user, waiting to be activated by the occurrence of a specific event or condition 26/71 Unix-like systems typically run numerous daemons, mainly to accommodate requests for services from other computers on a network, but also to respond to other programs and to hardware activity. Examples of actions or conditions that can trigger daemons into activity are a specific time or date, passage of a specified time interval, a file landing in a particular directory, receipt of an e-mail or a Web request made through a particular communication line. It is not necessary that the perpetrator of the action or condition be aware that a daemon is listening, although programs frequently will perform an action only because they are aware that they will implicitly arouse a daemon. Question: What Is Process In Linux? Daemons are usually instantiated as processes. A process is an executing (i.e., running) instance of a program. Processes are managed by the kernel (i.e., the core of the operating system), which assigns each a unique process identification number (PID). There are three basic types of processes in Linux: Download 1.91 Mb. Do'stlaringiz bilan baham: |
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