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General

set disassembly-flavor intel

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

Print and Examine

show bytes pointed by register with offset:

x/16bx $rsi+0x42

print array with size as bytes in registers:

p/x *(char *)$rcx@$dx

set conditional breakpoint:

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

set conditional logpoint:

break func_name
commands
  silent
  printf "msg: %d\n", *($rdi+0x34)
  cont
end