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By “using the .txt form of a pdf file” I take it you mean editing a PDF file using a text editor. Doing so is possible, if you take into account the requirements of the PDF format; in particular, it includes a number of indexes, which need to be updated when offsets of content inside the file are changed. So really, you shouldn’t use a text editor to modify ...
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Generally speaking, you don't (because unless you're able to (re)configure the keyboard, terminals won't send a distinct set of characters for ShiftSpace).
Beyond that, lynx doesn't have a special feature for mapping key-modifiers since that's too terminal-specific to have been standardized. Lynx's KEYMAP feature uses a subset of the standard terminfo ...
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The configuration function does receive an options attr, so it is possible to check if a given option is defined using builtins.hasAttr before setting it in the configuration.
Most NixOS configurations don't extract options, so you may need to add it first. For example:
{ config, pkgs, options, ... }:
{
programs.gnupg.agent =
{ enable = true; } //
...
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