znichola / notes42

notes42

Used for the cours at 42Lausanne

terminal commands

cmp

$ cmp foo bar compares the two files

dd if=/dev/urandom of=foo bs=1000 count=1000 writes a 1mb file of random data

inspecting binary files

explication video and another to look at later

strings

$ string a.out to bump all printable string in a.out

readelf

$ readelf --symbols a.out list all named symbols used

objectdump

$ objectdump -t ./a.out simmilar to readelf

$ objectdump -s ./a.out see sections

$ objectdump -d ./a.out disassemble it

strip

$ strip a.out removes symbols from binary, makes it a bit smaller and harder to interpret

gcc

-g flag add debug symbols to binary

signals

pgrep a.out gets the process id for a.out

kill -INT 543 send a process an interupt signal ps -A | less list process running can also use ps -e