NEED.COM, AVOID.COM, and SNIFF.COM are a trio of utilities
for ensuring the environment is friendly before continuing.
They will test the waters for and report back on such things
as:

1. Is there sufficient conventional, extended and expanded
RAM?

2. Is there sufficient free disk space?

3. Are the necessary DOS utilities loaded like QEMM,
SHARE, and BTRIEVE?

4. Do you have a sufficiently powerful CPU? and NPX
(numeric co-processor)?

5. In this the right day of the month, or day of the week,
time of day to run this job?

You tell NEED what you want, then it does all the tests then
returns a simple GO/NO-GO ERRORLEVEL you can test. If it is
0 all is ok. If it is 1, one or more of the requirements
failed.

TYPICAL USE

NEED and AVOID are a complementary pair of utilities. NEED
is for telling what you WANT, and AVOID is for telling what
you DON'T WANT. SNIFF is just for finding out what's out
there, without any preconceived notion of how it should be.

NEED DESQview DOS3.3- 80386! C:3MB

If Errorlevel 1 GoTo Trouble

DESQview means you must be running under DESQview.

DOS3.3- means you need DOS 3.3 or lower.

80386! means you must have an 386 processor, no more
no less.
there are dozens of possible tests.

• Confirm 1.2
  Ask user for Yes/No confirmation. Used in a bat file to set errorlevel to 0 if user answers Y, or 1 if N. echo Do you really want to do this dangerous thing? confirm ...