60 lines
2.7 KiB
Plaintext
60 lines
2.7 KiB
Plaintext
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[Disclaimer: I do not know enough (by far) about the inner workings
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and secrets of these printer-consoles, so please correct me/send advice,
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if there are better solutions!]
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On 3215/327x things are dramatically different from everywhere else.
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You'll have to live with some severe limitations:
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0. Interactivity is quite limited. You'll need to "blindly" type,
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most of the time, to see the effect only on "submission" ([Enter]).
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In edit and shell mode it's sometimes useful to insert underlines
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just to see, where the curser (AKA "point") is. (BTW, 3270 is _much_
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better at displaying/refreshing grub2 screens than 3215.)
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1. No cursor-movement-, alt-, meta-, and control-keys (like [ESC]).
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2. To work around the lack of control-keys, the "[^][C]-sends-interrupt"-
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trick is extended to translate sequences of caret followed by character
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to the respective control-character. In the following this sequence
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of two keystrokes is referred to as '^c' instead of that somewhat balky
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[^][C]. Thus an [ESC] keypress can be generated with '^[' ("caret"
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followed by "opening square bracket").
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3. If a caret itself is needed, send one on it's own (i.e. a solitary [^]
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followed by [Enter] -- or use '^^'.
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4. No '[Enter]', because it can't be avoided on *any* input.
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5. If you still need one to arrive at the application, you may either
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press '[Enter]' *twice* (one empty line, sort of) or add '^j' to your
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input. In menu mode '^f' works as well (see below). But using "empty
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lines" does now work very reliably, so explicit control sequences
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are to be preferred. This has the additional advantage, that combined
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sequences can be sent, e.g. to exit from 'grub2-emu' without doing
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anything, you can simply type 'cexit^j' and submit that with [Enter].
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Common Substitutes:
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'^j'` => [Enter] "engage"
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'^[' => [ESC] "abort" / return to previous "state"
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'^i' => [TAB] try completion (in edit & shell mode)
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Available Keys in Menu Mode:
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'^a' first entry '^e' last entry
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'^p' previous entry '^n' next entry
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'^g' previous page '^c' next page
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'^f' boot selected entry/enter sub-menu (same as '^j')
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'e' edit selected entry 'c' enter grub-shell
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Available Keys in Edit Mode:
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'^p' previous line '^n' next line
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'^b' backward char '^f' forward char
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'^a' beginning of line '^e' end of line
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'^h' backspace '^d' delete
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'^k' kill (to end of) line '^y' yank
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'^o' open line '^l' refresh screen
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'^x' boot entry '^c' enter grub-shell
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Availble Keys on Command Line Mode:
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'^p' previous command '^n' next command (from history)
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'^a' beginning of line '^e' end of line
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'^b' backward char '^f' forward char
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'^h' backspace '^d' delete
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'^k' kill (to end of) line '^u' discard line
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'^y' yank
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