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The *nix command nm shows function names used in a program. Suppose you run nm on an executable file and discover that: “U _printf” - that is, the function printf() is undefined (the file does not con...

The *nix command nm shows function names used in a program. Suppose you run nm on an executable file and discover that: “U _printf” - that is, the function printf() is undefined (the file does not contain code to implement this function). Yet, when you run the program, it runs perfectly well. How can this program run, if it still has undefined functions in it before being loaded into memory?

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The bash have default version printf function defined, so if the user is not going to defined the definition of the printf function then default definition of the printf function will be used.

Therefore even if printf function is not defined in the program, still it will execute without any error by using the definition of the default printf function of the bash

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