$7.$ Write a sed script to do the following, without using line numbers, except when referring to the first line:

$-$ Print the lines with continent info with:

$--$ the first semicolon $($;$)$ changed to colon $($:$)$

$--$ all commas removed from the numbers in the $2$nd field

$-$ Remove the first line

$-$ Change each blank line to a line of equal signs $(=)$

Your screen output should be: $===========$

Africa:$11730000$;$87\mathrm{.}15$

Asia:$16920000$;$246\mathrm{.}11$

Australia:$3478200$;$8\mathrm{.}37$

Europe:$3930000$;$187\mathrm{.}84$

North America:$9460000$;$57\mathrm{.}29$

South America:$6890000$;$56\mathrm{.}90$

$===========$

To document step $7$ in your output file:

$-$ If you use the script utility to record your answer, there are $2$ steps:

$--$ Use the cat command to display your sed script

$--$ Then run the sed script to produce the output

$-$ If you don$$t use the script utility to record your answer, there are $3$ steps:

$--$ copy your sed script to the output file

$--$ run the sed script to produce the output

$--$ copy and paste both the sed command line and the output