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If the AutoOpts client program specifies environrc in its
option descriptor file, then environment variables will be used for
presetting option state. Variables will be looked for that are named,
PROGRAM_OPTNAME and PROGRAM. PROGRAM is the
upper cased C-name of the program, and OPTNAME is the
upper cased C-name of a specific option. (The C-names
are the regular names with all special characters converted to
underscores (_).)
Option specific environment variables are processed after (and thus
take precedence over) the contents of the PROGRAM environment
variable. The option argument string for these options takes on the
string value gotten from the environment. Consequently, you can only
have one instance of the OPTNAME.
If a particular option may be disabled, then its disabled state is
indicated by setting the PROGRAM_OPTNAME value to the
disablement prefix. So, for example, if the disablement prefix were
dont, then you can disable the optname option by setting
the PROGRAM_OPTNAME' environment variable to `dont'.
See section Common Option Attributes.
The PROGRAM environment string is tokenized and parsed much
like a command line. Doubly quoted strings have backslash escapes
processed the same way they are processed in C program constant
strings. Singly quoted strings are "pretty raw" in that backslashes are
honored before other backslashes, apostrophes, newlines and cr/newline
pairs. The options must be introduced with hyphens in the same way as
the command line.
Note that not all options may be preset. Options that are specified with the
no-preset attribute and the --help, --more-help,
and --save-opts auto-supported options may not be preset.
This document was generated by Bruce Korb on September, 30 2006 using texi2html 1.76.