1.

In the terminal:

cp hello.c hello2.c _|ENTER|

mv hello2.c hello_friend.c _|ENTER|

mkdir new _|ENTER|

mv hello_friend.c new _|ENTER|

2.

sed 's/[Hh]ello [Ww]orld/Hello Friend/' hello.c > new/hello_friend.c _|ENTER|

3.

cp hello.c tmp _|ENTER|

for nnm in Juan Susana Britt ; do sed "s/World/${nnm}/" tmp > hello_${nnm}.c ; gcc -o hello_${nnm} hello_${nnm}.c ; done _|ENTER|

./hello_Susana _|ENTER|

./hello_Britt _|ENTER|

Hello Susana

Hello Britt

4.

cd /root _|ENTER|

tar -czvf myStuff.tar.gz hello.c bench.py new _|ENTER|

ls _|ENTER|

mkdir some _|ENTER|

cd some _|ENTER|

tar -xzvf ../myStuff.tar.gz _|ENTER|

ls _|ENTER|

ls new _|ENTER|

pwd _|ENTER|

hello.c

bench.py

new/

new/hello_friend.c

bench.py hello_Brit hello_Juan hello_Susana.c tmp hello hello_Brit.c hello_Juan.c myStuff.tar.gz

hello-banksy.c hello.c hello_Susana new

hello.c

bench.py

new/

new/hello_friend.c

bench.py hello.c new

ls new

hello_friend.c

/root/some

5.

cd ~ _|ENTER|

ls -l hello _|ENTER|

chmod g-x,o-x,o-r hello _|ENTER|

ls -l hello _|ENTER|

-rwxr-xr-x 1 root root 9448 Sep 18 12:13 hello

-rwxr----- 1 root root 9448 Sep 18 12:13 hello

6.

Login and open the terminal:

WARNING DO NOT DO THIS ON THE VIRTUAL WEB TERMINAL, YOU COULD BE GIVING AWAY YOUR PASSWORDS AND COMPROMISING BARRACUDA'S SECURITY!

7.

ssh user@132.248.131.98 _|ENTER|

The answers here will not be equal to what you get, just a hint.

user@132.248.131.98's password:
Last login: Fri Feb 7 16:24:55 2020 from 192.168.100.31
Bienvenido a Barracuda
ooooooooooooooo OJO ooooooooooooooooo
El sistema esta activo y no hay cortes de energia programados.
feliz 2020!
El respaldo de la informacion es responsabilidad de los usuarios.
[user@barracuda ~]$

8.

pwd _|ENTER|

ls _|ENTER|

/home/user

bin curso progs proy sd.log test

9.

man pwd _|ENTER|

seq -w 1 3.1416 300 > myseq1 _|ENTER|
seq -w 500 -3.1416 200 > myseq2 _|ENTER|
paste myseq1 myseq2 > myseq3 _|ENTER|

grep "1416" myseq3 _|ENTER|

grep "4" myseq3 | more _|ENTER|

sort -k 2 myseq3 | more _|ENTER|

cat myseq3 _|ENTER|

cat myseq3 | wc -l _|ENTER|

grep "8" myseq3 | tr "\t" "/" _|ENTER|

sort -k 2 myseq3 | head -n 10 | sort -k 1 > myseq_top _|ENTER|

cat myseq_top _|ENTER|

sort -k 1 myseq3 | tail -n 15 | sort -k 2 > myseq_bottom _|ENTER|

cat myseq_top _|ENTER|

for nnm in `seq 1 4 500 ` ;
do echo "${nnm}\t$RANDOM" >> myrandseq ; done _|ENTER|

more myrandseq _|ENTER|

10.

logout _|ENTER|

connection closed to 132.248.131.98