Re: How to do arithmetic evaluation

[Paul D. Smith]

%% address@hidden writes:

  mc> Thanks for the help offered by Mr Paul D. Smith .  I have tried
  mc> both "$(())" and "$$(())",but neither works.For example,the
  mc> statement "echo $$((3+1))" will result in " +1c".I don't know if I
  mc> should download gnumake again.

You should provide a complete example.

However, remember that make (all makes, including GNU make) invoke
/bin/sh to execute commands.  It's quite likely that /bin/sh is a
standard Bourne shell and doesn't provide complex operations like
builtin arithmetic evaluation.

Either use expr (echo `expr 3 + 1`) or set the SHELL make variable to
/bin/ksh or similar.

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