Changes between SVR3.1 and SVR4

The System V Release 4 version of Unix awk added these features (some of which originated in gawk):

• The ENVIRON variable (see section Built-in Variables).
• Multiple `-f' options on the command line (see section Command Line Options).
• The `-v' option for assigning variables before program execution begins (see section Command Line Options).
• The `--' option for terminating command line options.
• The `\a', `\v', and `\x' escape sequences (see section Escape Sequences).
• A defined return value for the srand built-in function (see section Numeric Built-in Functions).
• The toupper and tolower built-in string functions for case translation (see section Built-in Functions for String Manipulation).
• A cleaner specification for the `%c' format-control letter in the printf function (see section Format-Control Letters).
• The ability to dynamically pass the field width and precision ("%*.*d") in the argument list of the printf function (see section Format-Control Letters).
• The use of regexp constants such as /foo/ as expressions, where they are equivalent to using the matching operator, as in `$0 ~ /foo/' (see section Using Regular Expression Constants).

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