Concatenation of Output to a File

Concatenation of Output to a File

Sometimes you want to run a program several times and put the output of all the runs into a single file. For example, say that you want the discounted price of several items to be saved in one file. Here is how to do this:

C:/>java DiscountErr > discount.out
Enter list price in cents: 100
Enter discount in percent: 10
Discount Price: 90

C:/>java DiscountErr >> discount.out
Enter list price in cents: 150
Enter discount in percent: 15
Discount Price: 128

C:/>java DiscountErr >> discount.out
Enter list price in cents: 200
Enter discount in percent: 30
Discount Price: 140

The double "greater than" signs >> mean to add the new output to the end of the file discount.out. This is called concatenation of the output to a file. Here is what the disk file now looks like:

C:/>type discount.out
Price in cents: 100
Discount: 10
Discount Price: 90
Price in cents: 150
Discount: 15
Discount Price: 128
Price in cents: 200
Discount: 30
Discount Price: 140

C:/>