IF Exist Do Statement (Batch File)

Question

Please could someone give me an example in batch of something like:

IF test.txt EXISTS DO start test.txt

Answer 1

You can do if /? or help if , you know.

if exists file command

For multiple commands (or when using else ), enclose them with parentheses, ie

if exists file (
    command1
    command2
)

Answer 2

范例-

IF EXIST test.txt start test.txt