Commands that have come long after do not have that limit, due to such rapid enhancements in hardware, as well as in software. It doesn’t necessarily mean you cannot execute commands that are more than 6 letters, probably. The good news: you can install the sudo command on Debian and give your user the sudo permissions. Our typical workflow includes the sudo command at the beginning of commands. This command has stayed the same since then, and so did the other commands, and were passed down on newer generation operating systems like Linux. We recently provisioned a new Debian VM and noticed that the sudo command wasn’t available. Hence, all the commands back then were made keeping that limit in mind, which is the sole reason why you need to type out umount instead of unmount. The earliest of UNIX systems only incapable of running commands that exceeded 6 letters. One thing you’d notice among all these commands is that none of these exceed any more than 6 letters. Some of them are cd, ls mv, cp, passwd, and not to mention, mount and umount. There are a lot of commands you’ll find in Linux that are quite old (at least a decade) that come from its ancestor UNIX. So why on Earth did it have to be umount? Why couldn’t they just add another letter to simply make life easier? It’s not until you really see the reasons behind all of this mess. To unmount a filesystem, you need to type “ umount”, without the “ n”. If you’ve used the mount command, then the probable thing to come in mind for unmounting would be unmount command, and that’s exactly where you may start to see the frustration occurring. You don’t need to feel noobish for this, because every now and then at least 4 out of 5 users are definitely doing the same – spelling the wrong command for unmounting filesystems.
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