Copy the script and run it on your system and give a detail comment of what each line is doing.

$------------------------------------------------$

#$!/$bin$/$bash

# Scriptname: tellage

#

read $-$p$"$How old are you? $"$

age$=$$REPLY

if $(($ age $<0||$ age $>120))$

then

echo "You are not a real person! $"$

exit $1$

fi

if $(($ age $>=0$ && age $<13))$

then

echo "You still have some of the best years of your life ahead."

elif $(($ age $>12$ && age $<20))$

then

echo "Important years to learn"

elif $(($ age $>=20$ && age $<30))$

then

echo "Time to find a potential mate!!"

elif $(($ age $>=30$ && age $<40))$

then

echo "You are probably changing diapers"

else

echo "Sorry I asked"

fi

$-----------------------------------------$