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Top Forums Shell Programming and Scripting [ksh] how to reload history file without entering a command Post 303027914 by DevuanFan on Friday 28th of December 2018 07:38:39 AM
Old 12-28-2018
Quote:
Originally Posted by bakunin
as far as i know there is no "history buffer" - apart from the history file - in ksh...In each case "history" in the Korn shell is what is in this history file, nothing more, nothing less.
bakunin
Hi, bakunin. I'm finding that it is not so simple. If I have ksh running in a terminal emulator and manually edit the history file while the emulator is running, lines that I add to the HISTFILE will be picked up by the emulator. However, lines that I delete from the HISTFILE continue to show up in the terminal emulator's history. So it seems that the shell's idea of the history (which I'm calling its "history buffer") and what's actually in the HISTFILE are two different things. The only way for deleted lines to stop showing is to close the terminal emulator and open a new one.

Maybe my terminal emulator is introducing some unexpected behavior? I'll try a different emulator.

Thank you Jim and Neo. Yes, I'm finding that the only way to understand exactly what's going on will be to look at the source code. Alas, while my sh/bash, python, and perl kung fu is strong, C/C++ looks like gibberish to me, but I'll give it a shot anyway. If switching terminal emulators and/or recompiling ksh don't give me exactly the behavior I want, I may just go back to bash, which feels much more comfortable.

P.S. I'm using the public domain korn shell v5.2.14 (the default shell in OpenBSD 6.4).
 

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DICT_LOOKUP(1)															    DICT_LOOKUP(1)

NAME
dict_lookup - DICT Protocol Client SYNOPSIS
dict_lookuop [options] DESCRIPTION
dict_lookup reads X selection, then open terminal emulator and run dict client in it allowing user to view content using pager. It makes sense to configure launching dict_lookup on a keyboard shortcut in the window manager. OPTIONS
-h display help message. -x x X coordinate of terminal emulator. -x Y Y coordinate of terminal emulator. -s WxH width and height of terminal emulator separated by 'x'. -q query query, if it is specified, X selection is not read. ENVIRONMENT
dict_lookup recognizes the following environment variables. The default value is specified in square brackets. D_AWK_PROG AWK interpreter to use. [awk] D_XCLIP_PROG xclip application. [xclip] D_XTERM_PROG xterm or equivalent terminal emulator. [xterm] D_UTF8_LOCALE UTF-8 locale. [first available UTF-8 locale on system] D_DICT_PROG Dictionary client program. [dict] D_DICT_SERVER Option for dictionary client specifying the server. [-h dict.org] D_DICT_PORT Option for dictionary client specifying the port. [-p 2628] D_DICT_DB_OPT Option for dictionary client specifying the database. [-d foldoc] D_XTERM_CLASS Option for terminal emulator specifying the class. [-class XTerm] D_XTERM_NAME Option for terminal emulator specifying the name. [-name xterm_dict] D_XTERM_TITLE Option for terminal emulator specifying the title. [-title dict_lookup] D_TEXT_WIDTH Program calculating text width for given text. [cyrillic_text_width] cyrillic_text_width doesn't work correctly for Japanese, Korean, Chinese and some other languages. D_TERM_X Terminal emulator X coordinate. [+200] D_TERM_Y Terminal emulator Y coordinate. [+200] D_TERM_H Terminal emulator height. [+40] D_PAGER Pager. [less -R] SEE ALSO
dict(1), less(1), xterm(1), dictd(8), http://www.dict.org, RFC 2229 9 January 2011 DICT_LOOKUP(1)
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