NOTE: The factor command didn’t get very far on factoring that last value because 1987 is a prime number. jot The jot command allows you to create a list of numbers.

After adding the value of column 2 in each row to SUM, we can either output SUM directly, or we can divide it by a predefined special variable, NR, which means "Number of Rows." ...

The first command checks to see if the build number file exists. If it doesn't a single line of text, a zero is written to it. The second command uses cat to get the line of text and the shell's built ...