mkdir Tmhma11_1
cd Tmhma11_1

tee readme.txt ---- Πληκτρολογείτε

Hello World,

Day 1,
Day 2,
Day 3,
Day 4.

Sed Instructions

---------------------------------------------

1.sed 's/Day/Night/g' readme.txt > readme1.txt
2.sed -e 's/Day/day/g' -e 's/,/!/g' readme.txt > readme2.txt
3.sed '/Day 2/d' readme.txt > readme3.txt
4.sed 's/Night/night/g' readme1.txt > readme4.txt  

mkdir Askhsh2

cp *.txt Askhsh2/
mv *.txt Askhsh2/

tar -c Askhsh2 > Askhsh2.tar
gzip Askhsh2.tar

gunzip Askhsh2.tar.gz
tar -xvf Askhsh2.tar

chmod 754 *.txt