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There is more to sed(1) than s///

Posted 10-16-2016 at 04:16 AM by Turbocapitalist
Updated 10-16-2016 at 08:57 AM by Turbocapitalist

There is more to sed(1) than s///

There are books written about sed(1), a stream editor which can filter and transform streams of text, because it can do a lot more than many suspect. It actually uses a very simple and compact language which, though limited, is concise. I used sed(1) for ages and ages without exploring more of what it can do. It's most often used only with the s/// substitution, but it also has other capabilities.

selecting or deleting lines
alternate

...

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Misuse of sudo(8) and sudoers(5)

Posted 10-07-2016 at 06:46 AM by Turbocapitalist

Tags least privilege, sudo, system administration

The utility sudo(8) runs programs as another user. Frequently, that other user is root, but it does not have to be, the utility can also be used to downgrade privileges. Often it is mis-used to provide full root access to a group of users in place of su(1). However, sudo(8) was developed to give selective access to machines, following the principle of least privilege. It can achieve a very fine granularity of access, even allowing just specific programs or specific options for specific programs....

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Sharing Write Access to a Web Directory for Multiple Users

Posted 05-29-2016 at 07:29 AM by Turbocapitalist

Tags group permissions

In a multi-user environment, group permissions are the way to allow more than one user write access to the web server's document root. Just pick a name for the new group and apply it. It could go something like this:

Code:

groupadd webmeisters
chown -R root:webmeisters /var/www/html/
find /var/www/html/ -type d -exec chmod u=rwx,g=rwxs,o=rx "{}" \;
find /var/www/html/ -type f -exec chmod u=rw,g=rw,o=r "{}" \;

That...

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