m4
Computer programming language
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![PDF] Exploiting the m4 Macro Language | Semantic Scholar](/imgres?imgurl=https://d3i71xaburhd42.cloudfront.net/7cdb6095079427c05f7d85de49bfc1f1dbc67c6a/5-Table1-1.png&imgrefurl=https://www.semanticscholar.org/paper/Exploiting-the-m4-Macro-Language-Turner/7cdb6095079427c05f7d85de49bfc1f1dbc67c6a&h=1488&w=1240&tbnid=DN0FmAzdGq4eNM&q=M4+(computer+language)&tbnh=150&tbnw=125&usg=AI4_-kRJKi2XJaivJf_nW0DXkezqGlnnNw&vet=1&docid=MDvPubKhjQTBJM&sa=X&ved=2ahUKEwiL_NDtxtyFAxX0j4kEHeWDDHoQ9QF6BAgAEAY)
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m4 is a general-purpose macro processor included in most Unix-like operating systems, and is a component of the POSIX standard.
The language was designed by Brian Kernighan and Dennis Ritchie for the original versions of UNIX. Wikipedia
First appeared: 1977; 47 years ago