GDB baby step 1
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picoctf

Can you figure out what is in the eax register at the end of the main function? Put your answer in the picoCTF flag format: picoCTF{n} where n is the contents of the eax register in the decimal number base. If the answer was
To get the flag
-I opened the program in gdb
gdb debugger0_a
-put a breakpoint at main
break main
-moved using ni instruction until the needed value was put in rax
-To get the value in eax I used info registers

(gdb) ni
0x000055555555513d in main ()
(gdb) info registers
rax            0x86342             549698
rbx            0x0                 0
rcx            0x555555555140      93824992235840
rdx            0x7fffffffdf58      140737488346968
rsi            0x7fffffffdf48      140737488346952

picoCTF{549698}