I have a device that needs a block of memory that is reserved solely for it, without the OS intervening. Is there any way to tell BIOS or the OS that a block of memory is reserved, and it must not use it?
I know about swap – this question isn’t about that. In dmesg, the Linux (x86-64) kernel tells me this about how much memory I have:
Asked on serverfault but didn’t get enough attention, so reposted here, with the hope some people here know the answer.
I am (probably obviously) a relatively new Linux user, so I’m already bracing for the barrage of “why aren’t you doing it this way instead…” comments. I’d love to hear them…but I would also really like to fundamentally understand why this isn’t working as is.
This doesn’t work:
What’s the difference between these:
After starting a bash terminal, I noticed that the PATH variable contains duplicate entries. My terminal starts a login shell, so ~/.bash_profile is sourced, followed by ~/.profile and ~/.bashrc. Only in ~/.profile do I create the paths entries which are duplicated.
In Program 1 Hello world gets printed just once, but when I remove n and run it (Program 2), the output gets printed 8 times. Can someone please explain me the significance of n here and how it affects the fork()?
Does the command line have a way to get a recommended list of programs used to open a particular file, based on the file type? For example, a .pdf file would have an open with... recommendation using the programs Evince and Document Viewer.
So there’s chown which lets you change the owner and group of files and/or directories. But there’s also chgrp which only changes the group. Why was chgrp created? Isn’t it redundant?