The cymbol command did not work on old GDB versions like 8.2 because
they require the ADDR argument to be passed into the `add-symbol-file`
command unlike newer GDB versions in which the argument is optional.
This can be seen below.
```
pwndbg> help add-symbol-file
Load symbols from FILE, assuming FILE has been dynamically loaded.
Usage: add-symbol-file FILE ADDR [-readnow | -readnever | -s SECT-NAME SECT-ADDR]...
ADDR is the starting address of the file's text.
Each '-s' argument provides a section name and address, and
should be specified if the data and bss segments are not contiguous
with the text. SECT-NAME is a section name to be loaded at SECT-ADDR.
The '-readnow' option will cause GDB to read the entire symbol file
immediately. This makes the command slower, but may make future operations
faster.
The '-readnever' option will prevent GDB from reading the symbol file's
symbolic debug information.
pwndbg> version
Gdb: 8.1.1
Python: 3.6.9 (default, Jun 29 2022, 11:45:57) [GCC 8.4.0]
Pwndbg: 1.1.1 build: c5d8800
Capstone: 4.0.1024
Unicorn: 2.0.7
```
vs
```
pwndbg> help add-symbol-file
Load symbols from FILE, assuming FILE has been dynamically loaded.
Usage: add-symbol-file FILE [-readnow | -readnever] [-o OFF] [ADDR] [-s SECT-NAME SECT-ADDR]...
ADDR is the starting address of the file's text.
Each '-s' argument provides a section name and address, and
should be specified if the data and bss segments are not contiguous
with the text. SECT-NAME is a section name to be loaded at SECT-ADDR.
OFF is an optional offset which is added to the default load addresses
of all sections for which no other address was specified.
The '-readnow' option will cause GDB to read the entire symbol file
immediately. This makes the command slower, but may make future operations
faster.
The '-readnever' option will prevent GDB from reading the symbol file's
symbolic debug information.
pwndbg> version
Gdb: 12.1
Python: 3.10.6 (main, Nov 2 2022, 18:53:38) [GCC 11.3.0]
Pwndbg: 1.1.1 build: c5d8800
Capstone: 4.0.1024
Unicorn: 2.0.0
pwndbg>
```
Disconnect3d
1c609eba15