Your bug reports play an essential role in making the binary utilities reliable.
Reporting a bug may help you by bringing a solution to your problem, or it may not. But in any case the principal function of a bug report is to help the entire community by making the next version of the binary utilities work better. Bug reports are your contribution to their maintenance.
In order for a bug report to serve its purpose, you must include the information that enables us to fix the bug.
If you are not sure whether you have found a bug, here are some guidelines:
If a binary utility gets a fatal signal, for any input whatever, that is a bug. Reliable utilities never crash.
If a binary utility produces an error message for valid input, that is a bug.
If you are an experienced user of binary utilities, your suggestions for improvement are welcome in any case.