You can examine the resulting balance (see Querying The Balance).
Example 4-6. Let's look at amy's balance
$ gbalance -u amy
Id Name Amount Reserved Balance CreditLimit Available --- ---------------------------- ------------ ------------ ------------ ---------------- ------------- 1 biology 25000000 0 25000000 0 25000000 2 chemistry on colony 50000000 0 50000000 0 50000000 3 chemistry for amy 9000000 0 9000000 1000000 10000000
We see that amy's total balance is composed of some 25000000 credits useable toward the biology project, 50000000 for chemistry on colony and another 10000000 which can be used for chemistry on any machine. Notice that the 10000000 credits available for use in account 3 is composed of a 9000000 balance plus an overdraft limit of 1000000 (meaning your account can go negative by that amount).