CentOS System Administration Essentials by Andrew Mallett

By Andrew Mallett

CentOS is greatly revered as an important and versatile Linux distribution, and it may be used as an internet server, dossier server, FTP server, area server, or a multirole resolution. it's designed to deal with the extra not easy wishes of commercial functions resembling community and process management, database administration, and net providers. CentOS is self-sufficient and speedy whereas operating, with the additional benefit of world recognition as various the world's internet servers run on it.

This booklet not just concentrates at the fundamentals, but in addition vitamins your latest wisdom on topic parts which are vital within the firm industry, comparable to listing providers, safeguard configuration administration, and web-based structure. via the tip of this publication, it is possible for you to to control an firm Linux community occupied with management-centralized configuration, consumer administration, and filesystem improvements through masking every little thing from the most recent filesystem advances with BTRFS via to studying concerning the new internet server at the block—Nginx.

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Ls >> my_newfile #we now append another listing to the file $ stat -c%y my_newfile #displays the last modified time This is now 10:36 as opposed to 10:12 when the original content was created. The output from ls -l also shows the file's last modified time. The last changed time The last changed time of a file relates to when the metadata was changed, as opposed to the file's data. Changing the file permissions, for example, will alter the last changed time: $ chmod 640 my_newfile $ stat -c%z my_newfile The time for my system now shows that the file's metadata was changed at 10:41.

39 ] CentOS Filesystems – A Deeper Look However, the giving from the SGID does not stop with executable files. The SGID bit can also be set on directories. When set on a directory, the SGID bit ensures that all new files created within the directory are group owned by the group owner from the directory. To put this in context, let's say that our web server's document root, (where the web pages go), is set to the /var/www/html/ directory. If we set the group ownership of the directory to the apache group, we can then use the SGID bit to maintain the correct ownership of all files created.

The g option allows for the replacement to occur across all instances of Dragon even if it appears more than once per line. To do the same within Vim where we have the file open, run the following command: :%s/Dungeons/Dragons/g [ 15 ] Taming vi The percent symbol is used to specify the range as the whole document; whereas if we use the following command, we would only search lines 3 through 12 inclusive of the search string. In this case, the range is said to be lines 3 to 12 whereas with %, the range is the complete document.

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