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The term API seems to appear for the first time in the article of Ira W. Cotton, Data structures and techniques for remote computer graphics, published in 1968.
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uname(1) [centos man page]

UNAME(1)							   User Commands							  UNAME(1)

NAME
uname - print system information SYNOPSIS
uname [OPTION]... DESCRIPTION
Print certain system information. With no OPTION, same as -s. -a, --all print all information, in the following order, except omit -p and -i if unknown: -s, --kernel-name print the kernel name -n, --nodename print the network node hostname -r, --kernel-release print the kernel release -v, --kernel-version print the kernel version -m, --machine print the machine hardware name -p, --processor print the processor type or "unknown" -i, --hardware-platform print the hardware platform or "unknown" -o, --operating-system print the operating system --help display this help and exit --version output version information and exit GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report uname translation bugs to <http://translationproject.org/team/> AUTHOR
Written by David MacKenzie. COPYRIGHT
Copyright (C) 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
arch(1), uname(2) The full documentation for uname is maintained as a Texinfo manual. If the info and uname programs are properly installed at your site, the command info coreutils 'uname invocation' should give you access to the complete manual. GNU coreutils 8.22 June 2014 UNAME(1)

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UNAME(1)							   User Commands							  UNAME(1)

NAME
uname - print system information SYNOPSIS
uname [OPTION]... DESCRIPTION
Print certain system information. With no OPTION, same as -s. -a, --all print all information, in the following order, except omit -p and -i if unknown: -s, --kernel-name print the kernel name -n, --nodename print the network node hostname -r, --kernel-release print the kernel release -v, --kernel-version print the kernel version -m, --machine print the machine hardware name -p, --processor print the processor type or "unknown" -i, --hardware-platform print the hardware platform or "unknown" -o, --operating-system print the operating system --help display this help and exit --version output version information and exit AUTHOR
Written by David MacKenzie. REPORTING BUGS
Report uname bugs to bug-coreutils@gnu.org GNU coreutils home page: <http://www.gnu.org/software/coreutils/> General help using GNU software: <http://www.gnu.org/gethelp/> Report uname translation bugs to <http://translationproject.org/team/> COPYRIGHT
Copyright (C) 2010 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
arch(1), uname(2) The full documentation for uname is maintained as a Texinfo manual. If the info and uname programs are properly installed at your site, the command info coreutils 'uname invocation' should give you access to the complete manual. GNU coreutils 8.5 February 2011 UNAME(1)

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