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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN"> <!-- $LynxId: environments.html,v 1.14 2012/01/31 23:25:10 tom Exp $ --> <html> <head> <meta name="generator" content= "HTML Tidy for Linux/x86 (vers 6 November 2007), see www.w3.org"> <title>Help on Environment variables</title> <link rev="made" href="mailto:lynx-dev@nongnu.org"> <meta http-equiv="Content-Type" content= "text/html; charset=us-ascii"> </head> <body> <pre> <em>ENVIRONMENT</em> In addition to various "standard" environment variables such as HOME, PATH, USER, DISPLAY, TMPDIR, etc, Lynx utilizes several Lynx-specific environment variables, <a href= "#env">if they exist</a>. Others may be created or modified by Lynx to pass data to an external program, or for other reasons. These are listed separately <a href="#setenv">below</a>. See also the sections on <a href= "#cgi">SIMULATED CGI SUPPORT</a> and <a href="#language">NATIVE LANGUAGE SUPPORT</a>, below. Note: Not all environment variables apply to all types of platforms supported by Lynx, though most do. Feedback on platform dependencies is solicited. See also <a href= "#dos">win32/dos</a> specific variables. <a name="env"><em> Environment Variables Used By Lynx: </em></a> COLORTERM If set, color capability for the terminal is forced on at startup time. The actual value assigned to the variable is ignored. This variable is only meaningful if Lynx was built using the slang screen-handling library. LYNX_CFG This variable, if set, will override the default location and name of the global configuration file (normally, lynx.cfg) that was defined by the LYNX_CFG_FILE constant in the userdefs.h file, during installation. See the userdefs.h file for more information. LYNX_HELPFILE If set, this variable overrides the compiled-in URL and configuration file URL for the lynx help file. LYNX_LOCALEDIR If set, this variable overrides the compiled-in location of the locale directory which contains native lan- guage (NLS) message text. LYNX_LSS This variable, if set, specifies the location of the default Lynx character style sheet file. [Currently only meaningful if Lynx was built using experimental color style support.] LYNX_SAVE_SPACE This variable, if set, will override the default path prefix for files saved to disk that is defined in the lynx.cfg SAVE_SPACE: statement. See the lynx.cfg file for more information. LYNX_TEMP_SPACE This variable, if set, will override the default path prefix for temporary files that was defined during installation, as well as any value that may be assigned to the TMPDIR variable. LYNX_TRACE If set, causes Lynx to write a trace file as if the -trace option were sup- plied. LYNX_TRACE_FILE If set, overrides the compiled-in name of the trace file, which is either Lynx.trace or LY-TRACE.LOG (the latter on the DOS platform). The trace file is in either case relative to the home directory. MAIL This variable specifies the default inbox Lynx will check for new mail, if such checking is enabled in the lynx.cfg file. NEWS_ORGANIZATION This variable, if set, provides the string used in the Organization: header of USENET news postings. It will override the setting of the ORGANIZATION environment variable, if it is also set (and, on UNIX, the contents of an /etc/organization file, if present). NNTPSERVER If set, this variable specifies the default NNTP server that will be used for USENET news reading and posting with Lynx, via news: URL's. ORGANIZATION This variable, if set, provides the string used in the Organization: header of USENET news postings. On UNIX, it will override the contents of an /etc/organization file, if present. PROTOCOL_proxy Lynx supports the use of proxy servers that can act as firewall gateways and caching servers. They are preferable to the older gateway servers (see WWW_access_GATEWAY, below). Each protocol used by Lynx (http, ftp, gopher, etc), can be mapped separately by setting environment variables of the form PROTOCOL_proxy (literally: http_proxy, ftp_proxy, gopher_proxy, etc), to "http://some.server.dom:port/". See <a href= "#proxy">Proxy details and examples</a>. WWW_access_GATEWAY Lynx still supports use of gateway servers, with the servers specified via "WWW_access_GATEWAY" variables (where "access" is lower case and can be "http", "ftp", "gopher" or "wais"), however most gateway servers have been discontinued. Note that you do not include a terminal '/' for gateways, but do for proxies specified by PROTOCOL_proxy environment variables. See <a href= "#proxy">Proxy details</a>. WWW_HOME This variable, if set, will override the default startup URL specified in any of the Lynx configuration files. <a name="setenv"><em> Environment Variables Set or Modified By Lynx: </em></a> LYNX_PRINT_DATE This variable is set by the Lynx p(rint) function, to the Date: string seen in the document's "Information about" page (= cmd), if any. It is created for use by an external program, as defined in a lynx.cfg PRINTER: definition statement. If the field does not exist for the document, the variable is set to a null string under UNIX, or "No Date" under VMS. LYNX_PRINT_LASTMOD This variable is set by the Lynx p(rint) function, to the Last Mod: string seen in the document's "Information about" page (= cmd), if any. It is created for use by an external program, as defined in a lynx.cfg PRINTER: definition statement. If the field does not exist for the document, the variable is set to a null string under UNIX, or "No LastMod" under VMS. LYNX_PRINT_TITLE This variable is set by the Lynx p(rint) function, to the Linkname: string seen in the document's "Information about" page (= cmd), if any. It is created for use by an external program, as defined in a lynx.cfg PRINTER: definition statement. If the field does not exist for the document, the variable is set to a null string under UNIX, or "No Title" under VMS. LYNX_PRINT_URL This variable is set by the Lynx p(rint) function, to the URL: string seen in the document's "Information about" page (= cmd), if any. It is created for use by an external program, as defined in a lynx.cfg PRINTER: definition statement. If the field does not exist for the document, the variable is set to a null string under UNIX, or "No URL" under VMS. LYNX_VERSION This variable is always set by Lynx, and may be used by an external program to determine if it was invoked by Lynx. See also the comments in the distribution's sample mailcap file, for notes on usage in such a file. SSL_CERT_DIR Set to the directory containing trusted certificates. SSL_CERT_FILE Set to the full path and filename for your file of trusted certificates. TERM Normally, this variable is used by Lynx to determine the terminal type being used to invoke Lynx. If, however, it is unset at startup time (or has the value "unknown"), or if the -term command-line option is used, Lynx will set or modify its value to the user specified terminal type (for the Lynx execution environment). Note: If set/modified by Lynx, the values of the LINES and/or COLUMNS environment variables may also be changed. <a name="cgi"><em> SIMULATED CGI SUPPORT </em></a> If built with the cgi-links option enabled, Lynx allows access to a cgi script directly without the need for an http daemon. When executing such "lynxcgi scripts" (if enabled), the following variables may be set for simulating a CGI environment: CONTENT_LENGTH CONTENT_TYPE DOCUMENT_ROOT HTTP_ACCEPT_CHARSET HTTP_ACCEPT_LANGUAGE HTTP_USER_AGENT PATH_INFO PATH_TRANSLATED QUERY_STRING REMOTE_ADDR REMOTE_HOST REQUEST_METHOD SERVER_SOFTWARE Other environment variables are not inherited by the script, unless they are provided via a LYNXCGI_ENVIRONMENT statement in the configuration file. See the lynx.cfg file, and the (draft) CGI 1.1 Specification <http://Web.Golux.Com/coar/cgi/draft-coar-cgi-v11-00.txt> for the definition and usage of these variables. The CGI Specification, and other associated documentation, should be consulted for general information on CGI script programming. <a name="language"><em> NATIVE LANGUAGE SUPPORT </em></a> If configured and installed with Native Language Support, Lynx will display status and other messages in your local language. See the file ABOUT_NLS in the source distribution, or at your local GNU site, for more information about internationalization. The following environment variables may be used to alter default settings: LANG This variable, if set, will override the default message language. It is an ISO 639 two-letter code identifying the language. Language codes are NOT the same as the country codes given in ISO 3166. LANGUAGE This variable, if set, will override the default message language. This is a GNU extension that has higher priority for setting the message catalog than LANG or LC_ALL. LC_ALL and LC_MESSAGES These variables, if set, specify the notion of native language formatting style. They are POSIXly correct. LINGUAS This variable, if set prior to configuration, limits the installed languages to specific values. It is a space-separated list of two-letter codes. Currently, it is hard-coded to a wish list. NLSPATH This variable, if set, is used as the path prefix for message catalogs. <a name="proxy"><em> Proxy details and examples: </em></a> To set your site's NTTP server as the default host for news reading and posting via Lynx, set the environment variable NNTPSERVER so that it points to its Internet address. The variable "NNTPSERVER" is used to specify the host which will be used as the default for news URLs. UNIX setenv NNTPSERVER "news.server.dom" VMS define/system NNTPSERVER "news.server.dom" Lynx still supports use of gateway servers, with the servers specified via the variables "WWW_access_GATEWAY", where "access" is lower case and can be "http", "ftp", "gopher" or "wais". Most of the gateway servers have been discontinued, but "http://www.w3.org:8001" is available for wais searches (note that you do not include a terminal '/' for gateways, but do for proxies; see below). Lynx version 2.2 and beyond supports the use of proxy servers that can act as firewall gateways and caching servers. They are preferable to the older gateway servers. Each protocol used by Lynx can be mapped separately using PROTOCOL_proxy environment variables of the form: UNIX setenv http_proxy "http://some.server.dom:port/" setenv https_proxy "http://some.server.dom:port/" setenv ftp_proxy "http://some.server.dom:port/" setenv gopher_proxy "http://some.server.dom:port/" setenv news_proxy "http://some.server.dom:port/" setenv newspost_proxy "http://some.server.dom:port/" setenv newsreply_proxy "http://some.server.dom:port/" setenv snews_proxy "http://some.server.dom:port/" setenv snewspost_proxy "http://some.server.dom:port/" setenv snewsreply_proxy "http://some.server.dom:port/" setenv nntp_proxy "http://some.server.dom:port/" setenv wais_proxy "http://some.server.dom:port/" setenv finger_proxy "http://some.server.dom:port/" setenv cso_proxy "http://some.server.dom:port/" VMS define "http_proxy" "http://some.server.dom:port/" define "https_proxy" "http://some.server.dom:port/" define "ftp_proxy" "http://some.server.dom:port/" define "gopher_proxy" "http://some.server.dom:port/" define "news_proxy" "http://some.server.dom:port/" define "newspost_proxy" "http://some.server.dom:port/" define "newsreply_proxy" "http://some.server.dom:port/" define "snews_proxy" "http://some.server.dom:port/" define "snewspost_proxy" "http://some.server.dom:port/" define "snewsreply_proxy" "http://some.server.dom:port/" define "nntp_proxy" "http://some.server.dom:port/" define "wais_proxy" "http://some.server.dom:port/" define "finger_proxy" "http://some.server.dom:port/" define "cso_proxy" "http://some.server.dom:port/" (Encase *BOTH* strings in double-quotes to maintain lower case for the PROTOCOL_proxy variable and for the http access type; include /system if you want proxying for all clients on your system.) If you wish to override the use of a proxy server for specific hosts or entire domains you may use the "no_proxy" environment variable. The no_proxy variable can be a comma-separated list of strings defining no-proxy zones in the DNS domain name space. If a tail substring of the domain-path for a host matches one of these strings, transactions with that node will not be proxied. Here is an example use of "no_proxy": UNIX setenv no_proxy "host.domain.dom, domain1.dom, domain2" VMS define "no_proxy" "host.domain.dom, domain1.dom, domain2" You can include a port number in the no_proxy list to override use of a proxy server for the host accessed via that port, but not via other ports. For example, if you use "host.domain.dom:119" and/or "host.domain.dom:210", then news (port 119) URLs and/or any wais (port 210) searches on that host would be excluded, but http, ftp, and gopher services (if normally proxied) would still be included, as would any news or wais services on other hosts. Warning: Note that setting 'il' as an entry in this list will block proxying for the .mil domain as well as the .il domain. If the entry is '.il' this will not happen. If you wish to override the use of a proxy server completely (i.e., globally override any existing proxy variables), set the value of "no_proxy" to "*". This is the only allowed use of * in no_proxy. Note that Lynx treats file URLs on the local host as requests for direct access to the file, and does not attempt ftp if that fails. It treats both ftp URLs and file URLs on remote hosts as ftp URLs, and does not attempt direct file access for either. If ftp URLs are being proxied, file URLs on a remote host will be converted to ftp URLs before submission by Lynx to the proxy server, so no special procedure for inducing the proxy server to handle them is required. Other WWW clients may require that the http server's configuration file have "Map file:* ftp:*" in it to perform that conversion. If you have not set NNTPSERVER, proxy or no_proxy environment variables you can set them at run time via the configuration file lynx.cfg (this will not override external settings). <a name="dos"><em> Win32 (95/NT) and 386 DOS </em></a> (adapted from "readme.txt" by Wayne Buttles and "readme.dos" by Doug Kaufman) Here are some environment variables that should be set, usually in a batch file that runs the lynx executable. Make sure that you have enough room left in your environment. You may need to change your "SHELL=" setting in config.sys. In addition, lynx looks for a "SHELL" environment variable when shelling to DOS. If you wish to preserve the environment space when shelling, put a line like this in your AUTOEXEC.BAT file also "SET SHELL=C:\COMMAND.COM /E:2048". It should match CONFIG.SYS. HOME Where to keep the bookmark file and personal config files. TEMP or TMP Bookmarks are kept here with no HOME. Temp files here. USER Set to your login name LYNX_CFG Set to the full path and filename for lynx.cfg 386 version only: WATTCP.CFG Set to the full path for the WATTCP.CFG directory (Depending on how you compiled libtcp.a, you may have to use WATCONF.) Define these in your batch file for running Lynx. For example, if your application line is "D:\win32\lynx.bat", lynx.bat for Win32 may look like: @ECHO OFF set home=d:\win32 set temp=d:\tmp set lynx_cfg=d:\win32\lynx.cfg d:\win32\lynx.exe %1 %2 %3 %4 %5 In lynx_386, a typical batch file might look like: @echo off set HOME=f:/lynx2-8 set USER=your_login_name set LYNX_CFG=%HOME%/lynx.cfg set WATTCP.CFG=%HOME% f:\lynx2-8\lynx %1 %2 %3 %4 %5 %6 %7 %8 %9 You will also need to make sure that the WATTCP.CFG file has the correct information for IP number, Gateway, Netmask, and Domain Name Server. This can also be automated in the batch file. </pre> </body> </html>
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