====== General ======

attach to running process without break:

  gdb attach -ex cont -iex "set pagination off" $(pidof process_name)

<code>
set disassembly-flavor intel

define hook-stop
x/li $eip
x/8wx $esp
end
</code>

====== Print Command ======

print string pointed by $rdi:

  x/s $rdi
  
show bytes pointed by register with offset:

  x/16bx $rsi+0x42
  
print array with size as bytes in registers:

  p/x *(char *)$rcx@$dx
  p/x (char[size]) *$rcx

====== Breakpoint ======

break on address:

  b *0xdeadbeef

break at offset to function name:

<code>
b *(&func_name+0xbeef)
b *(funcname+0xbeef)
b *('class::method'+0xbeef)
</code>

set conditional breakpoint:

  break dlopen if strcmp(file, "libc.so") == 0  

set logpoint:

<code>
break func_name
commands
  silent
  printf "msg: %d\n", *($rdi+0xbeef)
  cont
end

</code>