gdb

 gdb exefile

basic command

file exefile

run/r

continue/c

next/n

step/s

print/p

quit/q

break filename:linenumber

break file:func

info break

watch,

break: clear delete enable disable

info locals

info registers

info all_registers

show args

print *array@len

print format

o - octal

x - hexadecimal

u - unsigned decimal

t - binary

f - floating point

a - address

c - char

s - string

https://visualgdb.com/gdbreference/commands/print

examine/x

x/nfu <address>

https://henrybear327.gitbooks.io/gitbook_tutorial/content/Linux/GDB/index.html

https://welkinchen.pixnet.net/blog/post/60935296-%E9%99%A4%E9%8C%AF%E5%B7%A5%E5%85%B7-gdb-%28the-gnu-project-debugger%29