How does GDB view the memory content of a specified address?

Format: X/NFU <ADDR>

Description
X is the abbreviation of examine.

N indicates the number of memory units to be displayed.

F indicates the display mode. The following values are recommended:
X displays variables in hexadecimal format.
D. Display variables in decimal format.
U displays unsigned integers in decimal format.
O display variables in octal format.
T display variables in binary format.
A displays variables in hexadecimal format.
I command address format
C. Display variables in character format.
F. Display variables in floating point format.

The u table shows the length of an address unit.
B Indicates a single byte,
H indicates double bytes,
W indicates four bytes,
G indicates an octal node.

Format letters are O (octal), x (HEX), D (decimal), u (unsigned decimal ),
T (Binary), F (float), A (address), I (Instruction), C (char) and S (string ).
Size letters are B (byte), H (halfword), w (Word), g (giant, 8 bytes)

Example
X/3uh Buf
Indicates reading content from the memory address Buf,
H indicates that the Unit is double bytes,
3 indicates three units,
Utable display in decimal format