G-code

G-code is a programming language created in 1950.

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G-code (also RS-274), which has many variants, is the common name for the most widely used numerical control (NC) programming language. It is used mainly in computer-aided manufacturing to control automated machine tools. G-code is sometimes called G programming language, not to be confused with LabVIEW's G programming language. Read more on Wikipedia...

G-code Wikipedia page
There are at least 4,457 G-code repos on GitHub
G-code first developed in Massachusetts Institute of Technology
file extensions for G-code include g, cnc, gco, gcode, mpt, mpf and nc
The Google BigQuery Public Dataset GitHub snapshot shows 106 users using G-code in 107 repos on GitHub
Pygments supports syntax highlighting for G-code
GitHub supports syntax highlighting for G-code
See also: (6 related languages)Gerber Image, LabVIEW G, Punched tape, HTML, CSS, Automatically Programmed Tool
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Example from Linguist:

G28 X0 Y0
G1 X55 Y5 F2000
G1 Y180
G1 X180
G1 Y5
G1 X55
G1 Y180
G1 X180
G1 Y5
G1 X55
M0

G-code - Programming language

Books about G-code from ISBNdb