Added features

• [unix utilities] sleep / pingpong / primes / find / xargs
• [system calls] trace / sysinfo
• (?) command line history (in sh.c)

Environment setup

Debug mode

make qemu-gdb

Then, in another terminal, run:

gdb-multiarch

Remote debugging

target remote localhost:26000
file kernel/kernel

usefull gdb commands:

layout split
continue
step
next
run