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# Unix
Unix is an [old](old.md) [operating system](operating_system.md) developed since 1960s as a research project of [Bell Labs](bell_labs.md), which has become one of the most influential pieces of software in history and whose principles (e.g. the [Unix philosophy](unix_philosophy.md)) live on in many so called Unix-like operating systems such as [Linux](linux.md) and [BSD](bsd.md) (at least to some degree). The original system itself is no longer in use, the name UNIX is nowadays a trademark and a certification.
*"Those who don't know Unix are doomed to reinvent it, poorly."* --obligatory quote by Henry Spencer
Unix is an [old](old.md) [operating system](operating_system.md) developed since 1960s as a research project of [Bell Labs](bell_labs.md), which has become one of the most influential pieces of software in history and whose principles (e.g. the [Unix philosophy](unix_philosophy.md)) live on in many so called Unix-like operating systems such as [Linux](linux.md) and [BSD](bsd.md) (at least to some degree). The original system itself is no longer in use, the name UNIX is nowadays a trademark and a certification. However, as someone once said, *Unix is not so much an operating system as a way of thinking*.
Unix has reached the highest level a software can reach: it has transcended its implementation and became a [de facto standard](de_facto_standard.md). This means it has become a set of interface conventions, cultural and philosophical ideas rather than being a single system, it lives on as a concept that has many implementations. This is extremely important as we don't depend on any single Unix implementation but we have a great variety of choice between which we can switch without greater issues. This is very important for [freedom](freedom.md) -- it prevents monopolization -- and its one of the important reasons to use unix-like systems.