什么是 Lynx CGI 脚本？

在 中lynx.cfg，它包含：

.h1 CGI scripts
# These settings control Lynx's ability to execute various types of scripts.

.h2 LOCAL_EXECUTION_LINKS_ALWAYS_ON
.h2 LOCAL_EXECUTION_LINKS_ON_BUT_NOT_REMOTE
# Local execution links and scripts are by default completely disabled,
# unless a change is made to the userdefs.h file to enable them or
# the configure script is used with the corresponding options
# (-enable-exec-links and -enable-exec-scripts).
# See the Lynx source code distribution and the userdefs.h
# file for more detail on enabling execution links and scripts.
#
# If you have enabled execution links or scripts the following
# two variables control Lynx's action when an execution link
# or script is encountered.
#
# If LOCAL_EXECUTION_LINKS_ALWAYS_ON is set to TRUE any execution
# link or script will be executed no matter where it came from.
# This is EXTREMELY dangerous.  Since Lynx can access files from
# anywhere in the world, you may encounter links or scripts that
# will cause damage or compromise the security of your system.
#
# If LOCAL_EXECUTION_LINKS_ON_BUT_NOT_REMOTE is set to TRUE only
# links or scripts that reside on the local machine and are
# referenced with a URL beginning with "file://localhost/" or meet
# TRUSTED_EXEC or ALWAYS_TRUSTED_EXEC rules (see below) will be
# executed.  This is much less dangerous than enabling all execution
# links, but can still be dangerous.
#
#LOCAL_EXECUTION_LINKS_ALWAYS_ON:FALSE
#LOCAL_EXECUTION_LINKS_ON_BUT_NOT_REMOTE:FALSE

.h2 TRUSTED_EXEC
# If LOCAL_EXECUTION_LINK_ON_BUT_NOT_REMOTE is TRUE, and no TRUSTED_EXEC
# rule is defined, it defaults to "file://localhost/" and any lynxexec
# or lynxprog command will be permitted if it was referenced from within
# a document whose URL begins with that string.  If you wish to restrict the
# referencing URLs further, you can extend the string to include a trusted
# path.  You also can specify a trusted directory for http URLs, which will
# then be treated as if they were local rather than remote.  For example:
#
#   TRUSTED_EXEC:file://localhost/trusted/
#   TRUSTED_EXEC:http://www.wfbr.edu/trusted/
#
# If you also wish to restrict the commands which can be executed, create
# a series of rules with the path (Unix) or command name (VMS) following
# the string, separated by a tab.  For example:
#
# Unix:
# ====
#   TRUSTED_EXEC:file://localhost/<tab>/bin/cp
#   TRUSTED_EXEC:file://localhost/<tab>/bin/rm
# VMS:
# ===
#   TRUSTED_EXEC:file://localhost/<tab>copy
#   TRUSTED_EXEC:file://localhost/<tab>delete
#
# Once you specify a TRUSTED_EXEC referencing string, the default is
# replaced, and all the referencing strings you desire must be specified
# as a series.  Similarly, if you associate a command with the referencing
# string, you must specify all of the allowable commands as a series of
# TRUSTED_EXEC rules for that string.  If you specify ALWAYS_TRUSTED_EXEC
# rules below, you need not repeat them as TRUSTED_EXEC rules.
#
# If EXEC_LINKS and JUMPFILE have been defined, any lynxexec or lynxprog
# URLs in that file will be permitted, regardless of other settings.  If
# you also set LOCAL_EXECUTION_LINKS_ON_BUT_NOT_REMOTE:TRUE and a single
# TRUSTED_EXEC rule that will always fail (e.g., "none"), then *ONLY* the
# lynxexec or lynxprog URLs in JUMPFILE (and any ALWAYS_TRUSTED_EXEC rules,
# see below) will be allowed.  Note, however, that if Lynx was compiled with
# CAN_ANONYMOUS_JUMP set to FALSE (default is TRUE), or -restrictions=jump
# is included with the -anonymous switch at run time, then users of an
# anonymous account will not be able to access the jumps file or enter
# 'j'ump shortcuts, and this selective execution feature will be overridden
# as well (i.e., they will only be able to access lynxexec or lynxprog
# URLs which meet any ALWAYS_TRUSTED_EXEC rules).
#
#TRUSTED_EXEC:none

.h2 ALWAYS_TRUSTED_EXEC
# If EXEC_LINKS was defined, any lynxexec or lynxprog URL can be made
# always enabled by an ALWAYS_TRUSTED_EXEC rule for it.  This is useful for
# anonymous accounts in which you have disabled execution links generally,
# and may also have disabled jumps file links, but still want to allow
# execution of particular utility scripts or programs.  The format is
# like that for TRUSTED_EXEC.  For example:
#
# Unix:
# ====
#   ALWAYS_TRUSTED_EXEC:file://localhost/<tab>/usr/local/kinetic/bin/usertime
#   ALWAYS_TRUSTED_EXEC:http://www.more.net/<tab>/usr/local/kinetic/bin/who.sh
# VMS:
# ===
#   ALWAYS_TRUSTED_EXEC:file://localhost/<tab>usertime
#   ALWAYS_TRUSTED_EXEC:http://www.more.net/<tab>show users
#
# The default ALWAYS_TRUSTED_EXEC rule is "none".
#
#ALWAYS_TRUSTED_EXEC:none

.h2 TRUSTED_LYNXCGI
# Unix:
# =====
# TRUSTED_LYNXCGI rules define the permitted sources and/or paths for
# lynxcgi links (if LYNXCGI_LINKS is defined in userdefs.h).  The format
# is the same as for TRUSTED_EXEC rules (see above).  Example rules:
#
#   TRUSTED_LYNXCGI:file://localhost/
#   TRUSTED_LYNXCGI:<tab>/usr/local/etc/httpd/cgi-bin/
#   TRUSTED_LYNXCGI:file://localhost/<tab>/usr/local/www/cgi-bin/
#
# VMS:
# ====
# Do not define this.
#
# The default TRUSTED_LYNXCGI rule is "none".
#
TRUSTED_LYNXCGI:none

.h2 LYNXCGI_ENVIRONMENT
# Unix:
# =====
# LYNXCGI_ENVIRONMENT adds the current value of the specified
# environment variable to the list of environment variables passed on to the
# lynxcgi script.  Useful variables are HOME, USER, etc...  If proxies
# are in use, and the script invokes another copy of lynx (or a program like
# wget) in a subsidiary role, it can be useful to add http_proxy and other
# *_proxy variables.
#
# VMS:
# ====
# Do not define this.
#
#LYNXCGI_ENVIRONMENT:

.h2 LYNXCGI_DOCUMENT_ROOT
# Unix:
# =====
# LYNXCGI_DOCUMENT_ROOT is the value of DOCUMENT_ROOT that will be passed
# to lynxcgi scripts.  If set and the URL has PATH_INFO data, then
# PATH_TRANSLATED will also be generated.  Examples:
#   LYNXCGI_DOCUMENT_ROOT:/usr/local/etc/httpd/htdocs
#   LYNXCGI_DOCUMENT_ROOT:/data/htdocs/
#
# VMS:
# ====
# Do not define this.
#
#LYNXCGI_DOCUMENT_ROOT:

Lynx 在这种情况下指的是哪种类型的脚本？它似乎不是 JavaScript（并且多个来源表明 Lynx 不支持它）。

CGI脚本不是主要在服务器端执行吗？

为什么像 Lynx 这样的网络浏览器会参与其中？