ll
uname -a
cd /proc/
ls
cat cpuinfo | less
df
cd
pwd
cd ..
ls
ll
less robots.txt 
cd picc
ll
cd ..
cd picc
vim firework1.c
ls
cd ..
ls
cd photo/
ls
cd bwfilm/
ls
cd yos-outdoor-club-2004-winter/
ll
cd ..
cd ..
cd 2004-yos-outdoor-club-winter/
ls
ll
cd tn
cd ..
ll
cd ..
cd ..
ll