The (1) means Unix manual pages, section 1. The "ssh(1)" means "read about ssh in man page section 1". Section 1 is for general commands. https://en.wikipedi

The (1) means Unix manual pages, section 1. The "ssh(1)" means "read about ssh in man page section 1". Section 1 is for general commands. https://en.wikipedia.org/wiki/Man_page https://en.wikipedia.org/wiki/Man_page Pages are traditionally referred to using the notation "name(section)": for example, ftp(1). The section refers to different ways the topic might be referenced. 1 General commands 2 System calls 3 Library functions 4 Special files such as devices /dev 5 File formats and conventions 6 Games and screensavers 7 Miscellaneous 8 System administration commands and daemons