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This question already has an answer here:

ls -l /bin/true shows it being 27168 bytes in size, whereas a c program that just returns 0 is much smaller. Also, running objdump -d /bin/true gives a huge assembly program with many system calls. Why is all this needed for a program that just "does nothing successfully"?

marked as duplicate by Mr Shunz, jimmij, Jeff Schaller, roaima, Jesse_b Feb 8 at 14:33

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migrated from stackoverflow.com Nov 2 '16 at 13:01

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Because apart from returning 0 it also handles help and version options, plus it contains some comments inside.

You can figure it by yourself by cloning the sources from Github, and looking at the content of coreutils/src/true.c.