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Month: March 2018

Google Cloud free Digital Conference and training on migration

Join Google Cloud experts for a free, digital conference with 15+ sessions and training on migrating to the cloud, modernizing with containers, and more. March 28, 8:30 AM IST Register Get cloud-ready When migrating to the cloud, which workloads should you prioritize? Get practical advice from Google Cloud engineers and customers. You’ll get more from the cloud when you modernize applications using containers and Google Kubernetes Engine. Connect live with our experts about how to get started. We have referred...

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Getting Started with Unix

Some prerequisites about terminals and typing: We assume you have some familiarity with computer terminals and how to use them. The Unix system is full duplex: the characters you type on the keyboards are sent to the system, which sends them back the terminal to be printed on the screen. Normally, this echo process copies the characters directly to the screen, so you can see what you are typing, but sometimes, such as when you are typing a secret password, the echo is turned off so that characters do not appear on the screen. Commands Description ls List name of all files in the current directory ls filename List only the named files ls -t List in time order, most recent first ls -l List long: more information; also ls -lt ls -u A list by time last used; also ls -lu, ls -lut ls -r List in reverse order; also –rt, -rlt, etc ed filename Edit named file cp file1 file2 Copy file1 to file2, overwrite old file2 if it exists mv file1 file2 move file1 to file2, overwrite old file2 if it exists rm filenames Remove named files, irrevocably cat filenames Print contents of named files pr filenames Print contents with header, 66 lines per page pr –n filenames Print in n columns pr –m filenames Print named files side by side (multiple columns) wc filename Count...

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What makes the UNIX system so successful?

We can discern several reasons. First, because it is written in C, it is portable – Unix system run on a range of computers from microprocessors to the largest mainframes; this is a strong commercial advantage. Second, the source code is available and written in a high-level language, which makes the system easy to adapt to particular requirements. Finally and most important, it is a good operating system, especially for programmers. The UNIX programming environment is unusually rich and productive. What is “Unix”? In narrowest sense, it is a time-sharing operating system. The kernel is a program that controls the resources of a computer and allocates them among its users. It lets user run their programs It controls the peripheral devices (discs, terminals, printers and etc…) connected to the machine It provides a file system that manages the long-term storage of information such as programs, data and In a broader sense, “Unix” is often taken to include not only the kernel, but also essential programs like compilers, editors, and command language, programs for copying and printing files and so on. Still more broadly, “Unix” may even include programs developed by you or other users to be run on your system, such as tools for documents preparation, routines for statistical analysis and graphics package. Finally, a word of advice: don’t be afraid to experiment. If you are a beginner, there...

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