Shell Programming and Scripting

hi all
i nid to write a script to display total disk space plus cpu processing time and convert them to dollars and cents.
how do write it in code?
is it using this
format cOtOdO <<!
i
!

i understand this juz show the disk space
but how to convert them and add together as one command?

Best start reading here and trying stuff out:
Linux Shell Scripting Tutorial - A Beginner's handbook

As a hint you might need the commands df and ps.

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