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Actions
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   Action statements are enclosed in braces, `{' and `}'.  Action
statements consist of the usual assignment, conditional, and looping
statements found in most languages.  The operators, control statements,
and input/output statements available are patterned after those in C.

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Operator Summary
`awk' operators.
Control Flow Summary
The control statements.
I/O Summary
The I/O statements.
Printf Summary
A summary of `printf'.
Special File Summary
Special file names interpreted internally.
Numeric Functions Summary
Built-in numeric functions.
String Functions Summary
Built-in string functions.
Time Functions Summary
Built-in time functions.
String Constants Summary
Escape sequences in strings.