AWK

AWK was created at Bell Labs in the 1970s, and its name is derived from the surnames of its authors: Alfred Aho, Peter Weinberger, and Brian Kernighan. The acronym is pronounced the same as the bird auk, which is on the cover of The AWK Programming Language.

-- wikipedia --

Reference:

• https://www.gnu.org/software/gawk/manual/gawk.html
• man awk

Language

Data driven programming language (compared with procdedural programming language)

An awk program

• @include "filename"
• @load "filename"
• @namespace "name"
• pattern { action statements }
• function name(parameter list) { statements }

pattern

• BEGIN
• END
• BEGINFILE
• ENDFILE
• /regular expression/
• relational expression
• pattern && pattern
• pattern || pattern
• pattern ? pattern : pattern
• (pattern)
• ! pattern
• pattern1, pattern2

action: { statements }

• expressions
  • operators
    • $ Field reference
    • ...
• control statements
• compound statments
• IO statments
  • next
  • print
  • ...
• deletion statements

function