basic command

uname

$ uname -a
Linux syd-svr-pes 4.16.9-1-ARCH #1 SMP PREEMPT Thu May 17 02:10:09 UTC 2018 x86_64 GNU/Linux

driver modules /lib/modules

cd /lib/modules

lsmod

$ lsmod
Module                  Size  Used by
nf_conntrack_ipv4      16384  18
...
...
...

let tar to figure out the compression way

tar xf somefile.tar.xz

more is old utility, use less instead of more

Becuase less is a bit massive than more, some embedded system only have more.

compile kernel

make menuconfig
make all
make modules_install # install modules to /lib/modules/
make install

strace

using strace to see the system call being called

https://www.youtube.com/watch?v=0IQlpFWTFbM

strace <your programe>

strace could filter as well.

perf, track L1 cache misses

ftrace, tracing kernel functions

/proc

recover the deleted but still runing exe files

get the cmdLine

get fd (file opened)

https://livegrep.com

http://eudyptula-challenge.org/

network

https://www.slideshare.net/hugolu/the-linux-networking-architecture