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setusershell(3) on Linux

The text e6aa226bdfa2, as Debian 2.2 (Potato), Debian 2.1 (Slink), Debian 2.0 (Hamm), Debian 1.3 (Bo), Debian 1.2 (Rex), Debian 1.1 (Buzz) shipped it.

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setusershell(3) on Linux now