Q:

Include a file to an executable script, grab line 1 and line 2, assign them to data_holders

Assume that there is a file named a.txt
which contains:
aaa
bbb

i need to create an executable script that
will grab these 2 lines from the a.txt
and then print them in the terminal.
in other words when i run..
./script

it needs to print
aaa:bbb

UPDATE
i need to assign the first line from the file a.txt
to the letter "a"
i need to assign the second line from the file a.txt
to the letter "b"
so that i can access "a" and "b" within my bash script
separately. 

A:

You can use awk to do this:
awk '{printf $1":"}' a.txt

