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# Advanced
## Command Entry
Access to the Lua state is available through the command entry. Press `F2` to
access it. It is useful for debugging, inspecting, and entering buffer or view
commands. If you try to cause instability in Textadept's Lua state, you might
very well succeed so be careful. For more information, see the
[scripting](11_Scripting.html) page.
Abbreviated commands for the `buffer`, `view` and `gui` are available. So
`buffer:append_text('foo')` can be shortened to `append_text('foo')`. `print()`
redirects to [`gui.print()`](../modules/gui.html#print). Use `_G.print()` for
Lua's `print()`.
#### Tab Completion
Tab-completion for functions, variables, tables, etc. is available. Press the
`Tab` key to display a list of available completions. Use the arrow keys to make
a selection and press `Enter` to insert it.
#### Extending
You can extend the command entry to do more than enter Lua commands. An
example of this is [incremental
search](../modules/gui.find.html#find_incremental). See
`modules/textadept/find.lua` for the implementation.
## Shell Commands and Filtering Text
Sometimes it is easier to use an existing shell command to manipulate text
instead of using the command entry. An example would be sorting all text in a
buffer (or a selection). You could do the following from the command entry:
ls={}; for l in buffer:get_text():gmatch('[^\n]+') do ls[#ls+1]=l end;
table.sort(ls); buffer:set_text(table.concat(ls, '\n'))
A simpler way would be to press `Alt+R` (`Ctrl+Apple+R` on Mac OSX), enter the
shell command `sort`, and hit `Enter`.
The standard input (stdin) for shell commands is determined as follows:
* If text is selected and spans multiple lines, all text on the lines containing
the selection is used. However, if the end of the selection is at the
beginning of a line, only the EOL (end of line) characters from the previous
line are included as input. The rest of the line is excluded.
* If text is selected and spans a single line, only the selected text is used.
* If no text is selected, the entire buffer is used.
The input text is replaced with the standard output (stdout) of the command.
## File Encoding
Textadept represents all characters and strings internally as UTF-8. You will
not notice any difference for working with files containing ASCII text since
UTF-8 is compatible with it. Textadept can also detect ISO-8859-1 and MacRoman,
the primary encodings used on Windows and Mac OSX respectively. Files with more
exotic encodings may not be detected properly, if at all. You can change the
list of encodings Textadept tries to detect via
[`io.try_encodings`](../modules/io.html#try_encodings).
It is recommended to use UTF-8 encoded files because UTF-8 is very well
supported by other text editors and operating systems. You can change the file's
encoding via the `Buffer -> Encoding` menu. Textadept saves new files as UTF-8
by default.
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