Created Configuring shell key bindings (markdown)

Configuring-shell-key-bindings.md

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+## `CTRL-T`
+
+### Preview
+
+You can preview the content of the file under the cursor by setting `--preview` option.
+
+```sh
+# Using highlight (http://www.andre-simon.de/doku/highlight/en/highlight.html)
+export FZF_CTRL_T_OPTS="--preview '(highlight -O ansi -l {} 2> /dev/null || cat {} || tree -C {}) 2> /dev/null | head -200'"
+```
+
+## `CTRL-R`
+
+### Sorting and exact matching
+
+Sort is disabled by default to respect chronological ordering. You dynamically toggle sorting by pressing `CTRL-R` again, but if you like to enable sorting by default you can add `--sort` to `FZF_CTRL_R_OPTS`. Also, if you prefer to use exact matching, add `--exact`.
+
+```sh
+export FZF_CTRL_R_OPTS='--sort --exact'
+```
+
+### Preview
+
+Commands that are too long are not fully visible on screen. You can use `--preview` option to see the full command on the preview window. In the following example, we bind `?` key to toggle preview window.
+
+```sh
+export FZF_CTRL_R_OPTS="--preview 'echo {}' --preview-window down:3:hidden --bind '?:toggle-preview'"
+```
+
+### Directly executing the command (CTRL-X CTRL-R)
+
+#### zsh
+
+```sh
+fzf-history-widget-accept() {
+  fzf-history-widget
+  zle accept-line
+}
+zle     -N     fzf-history-widget-accept
+bindkey '^X^R' fzf-history-widget-accept
+```
+
+#### bash
+
+```sh
+bind "$(bind -s | grep '^"\\C-r"' | sed 's/"/"\\C-x/' | sed 's/"$/\\C-m"/')"
+```
+
+### Dynamically choose to execute or edit
+
+There is an open issue for this; [#477](https://github.com/junegunn/fzf/issues/477). We have a solution for zsh, but not for bash.
+
+## `ALT-C`
+
+### Preview
+
+Use `tree` command to show the content of the directory on the preview window.
+
+```sh
+export FZF_ALT_C_OPTS="--preview 'tree -C {} | head -200'"
+```