1
root@professor:~# cd /
root@professor:/# mkdir avaliacao
root@professor:/# mkdir avaliacao/backup-etc
root@professor:/# mkdir avaliacao/conf
root@professor:/# mkdir avaliacao/programas

2
a)
root@professor:/# cp /etc/*.conf /avaliacao/conf/
root@professor:/# tree /avaliacao/

b)
cp -Rf /etc /avaliacao/backup-etc

c)
mv /avaliacao/programas/ /avaliacao/prova

d)
cp -Rf /avaliacao/backup-etc /avaliacao/backup-backup-etc

e)
rm -Rf /avaliacao/backup-etc

f)
mv /avaliacao/backup-backup-etc /tmp

g)
pwd

h)
cd
cd ~
cd #
cd /home/dailson

i)
ls -a /etc

j)
cut -d: -f1 /etc/passwd | sort | nl > usuarios.txt 

So os que logam:
 cut -d: -f1,7 /etc/passwd | grep -vi nologin | grep -vi false | sort | nl > usuarios.txt

m)
 scp dailson.txt dailson@10.4.1.8:~

n)
grep -in "ftp" /etc/services

3
a)
useradd -m -s /bin/bash simulado
passwd simulado

b)
CTRL+ALT+F2
htop

c)
htop

d) 
CTRL+ALT+F3
w
who