(gawk.info) V7/SVR3

 
 Major Changes between V7 and SVR3.1
 ===================================
 
    The `awk' language evolved considerably between the release of
 Version 7 Unix (1978) and the new version first made generally
 available in System V Release 3.1 (1987).  This section summarizes the
 changes, with cross-references to further details.
 
    * The requirement for `;' to separate rules on a line ( `awk'
      Statements Versus Lines Statements/Lines.).
 
    * User-defined functions, and the `return' statement (
      User-defined Functions User-defined.).
 
    * The `delete' statement ( The `delete' Statement Delete.).
 
    * The `do'-`while' statement ( The `do'-`while' Statement Do
      Statement.).
 
    * The built-in functions `atan2', `cos', `sin', `rand' and `srand'
      ( Numeric Built-in Functions Numeric Functions.).
 
    * The built-in functions `gsub', `sub', and `match' ( Built-in
      Functions for String Manipulation String Functions.).
 
    * The built-in functions `close', and `system' ( Built-in
      Functions for Input/Output I/O Functions.).
 
    * The `ARGC', `ARGV', `FNR', `RLENGTH', `RSTART', and `SUBSEP'
      built-in variables ( Built-in Variables).
 
    * The conditional expression using the ternary operator `?:' (
      Conditional Expressions Conditional Exp.).
 
DONTPRINTYET     * The exponentiation operator `^' ( Arithmetic Operators
      Arithmetic Ops.) and its assignment operator form `^=' (*note
DONTPRINTYET     * The exponentiation operator `^' ( Arithmetic Operators
      Arithmetic Ops.) and its assignment operator form `^=' (

      Assignment Expressions Assignment Ops.).
 
    * C-compatible operator precedence, which breaks some old `awk'
      programs ( Operator Precedence (How Operators Nest)
      Precedence.).
 
    * Regexps as the value of `FS' ( Specifying How Fields are
      Separated Field Separators.), and as the third argument to the
      `split' function ( Built-in Functions for String
      Manipulation String Functions.).
 
    * Dynamic regexps as operands of the `~' and `!~' operators (
      How to Use Regular Expressions Regexp Usage.).
 
    * The escape sequences `\b', `\f', and `\r' ( Escape
      Sequences).  (Some vendors have updated their old versions of
      `awk' to recognize `\r', `\b', and `\f', but this is not something
      you can rely on.)
 
    * Redirection of input for the `getline' function ( Explicit
      Input with `getline' Getline.).
 
    * Multiple `BEGIN' and `END' rules ( The `BEGIN' and `END'
      Special Patterns BEGIN/END.).
 
    * Multi-dimensional arrays ( Multi-dimensional Arrays
      Multi-dimensional.).
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