课程: Practical Linux for Network Engineers: Part 1

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Owners, groups, and permissions

Owners, groups, and permissions - Linux教程

课程: Practical Linux for Network Engineers: Part 1

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Owners, groups, and permissions

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- [Narrator] Linux supports abbreviated or longer command arguments. So you have short options as well as long options. As an example, with ls, if we use the command ls dash dash help, and I'll pipe that to less again. Notice we can use hyphen r for reverse so we can use a lowercase r or we can use the word reverse or uppercase r for the option recursive. This lists sub-directories recursively. Hyphen t is another option that allows us to sort the output by modification time, with the newest being first. So, some notes, be aware that in Linux, commands are case sensitive. Cisco writers is an example, some commands are case sensitive and some are not. So generally on Cisco, I personally always assume that commands are case sensitive. That is always true, however, on Linux. You have abbreviated or short commands, and you have long versions of the command. It's easier for us as humans to remember a word such as recursive rather than just a switch, such as r. So you can use both the short…

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