gawk: Intro Summary
1.9 Summary
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* Programs in 'awk' consist of PATTERN-ACTION pairs.
* An ACTION without a PATTERN always runs. The default ACTION for a
pattern without one is '{ print $0 }'.
* Use either 'awk 'PROGRAM' FILES' or 'awk -f PROGRAM-FILE FILES' to
run 'awk'.
* You may use the special '#!' header line to create 'awk' programs
that are directly executable.
* Comments in 'awk' programs start with '#' and continue to the end
of the same line.
* Be aware of quoting issues when writing 'awk' programs as part of a
larger shell script (or MS-Windows batch file).
* You may use backslash continuation to continue a source line.
Lines are automatically continued after a comma, open brace,
question mark, colon, '||', '&&', 'do', and 'else'.
Info Catalog
gawk: When
gawk: Getting Started