What is the purpose of the `libnsl.so.1` library in a Linux environment?

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What is the purpose of the `libnsl.so.1` library in a Linux environment?
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`libnsl.so.1` refers to the Network Services Library. Its primary function is to provide an interface for interacting with various network services, specifically those related to Sun Microsystems' Network Information Service (NIS/NIS+), also known as Yellow Pages (YP). While many modern applications have shifted away from direct NIS dependencies, older software or environments still relying on NIS functionality will require `libnsl` to operate correctly.