C. It displays the content of the Linux kernel's ring buffer.
E. It might not display older information because it was overwritten by newer information.
From Man Page for C:
dmesg is used to examine or control the kernel ring buffer.
The default action is to display all messages from the kernel ring buffer.
From Stackexchange question for E (https://unix.stackexchange.com/questions/181067/how-to-read-dmesg-from-previous-session-dmesg-0):
To clear up a fundamental misconception, dmesg does not read from /var/log/dmesg. It reads directly from the kernel ring buffer and gives you the most recent N messages.
What do these symptoms mean? ’ They are in several of the questions and answers but I have not been able to find a meaning for them or how they fit into the syntax. Can someone please help I will be taking this exam in abut 10 days and I really need to help with this!?
It's a ’ (RIGHT SINGLE QUOTATION MARK - U+2019) character which has been encoded as CP-1252 instead of UTF-8. If you check the encodings table, then you see that this character is in UTF-8 composed of bytes 0xE2, 0x80 and 0x99. If you check the CP-1252 code page layout, then you'll see that each of those bytes stand for the individual characters â, € and ™.
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