Linux

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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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You can't cd or ls in a folder if you have no +x permissions on it. That is all. I wasted 3 hours of my life. (szmer.info)

submitted 1 year ago by [email protected] to c/[email protected]

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[–] [email protected] 6 points 1 year ago

644 and 755 are the two most useful octal codes to remember because they make up the majority of files on your system. 644 is user read/write but read-only for everyone else. 755 adds execute to that, useful for scripts and directories.

Other than that, the most common other things are setting access for group and others to zero, so your ~/.ssh directory is 700 (rwx for you, no access for anyone else) and the private keys in it are 600, rw for you, no access for anyone else).