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$ ac --compatibility

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The command "ac --compatibility" is used to check the compatibility of the current system with POSIX standards.

POSIX stands for Portable Operating System Interface, which is a set of standards that defines how command-line interfaces, system calls, and utilities should behave in a Unix-like operating system.

When the "ac --compatibility" command is executed, it checks the system against the POSIX standards, verifying if the system adheres to these standards or if there are any incompatibilities. It will typically provide a report or output indicating any deviations from the standard.

This command is particularly useful when developing or porting software that needs to be compatible with various Unix-like systems, as it helps to identify any non-compliant behavior that may affect the software's functionality.

This explanation was created by an AI. In most cases those are correct. But please always be careful and never run a command you are not sure if it is safe.

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