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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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Xsession.options(5)						File Formats Manual					       Xsession.options(5)

NAME
Xsession.options - configuration options for Xsession(5) DESCRIPTION
/etc/X11/Xsession.options contains a set of flags that determine some of the behavior of the Xsession(5) Bourne shell (sh(1)) script. See the Xsession(5) manpage for further information. Xsession.options may contain comments, which begin with a hash mark ('#') and end at the next newline, just like comments in shell scripts. The rest of the file consists of options which are expressed as words separated by hyphens, with only one option per line. Options are enabled by simply placing them in the file; they are disabled by prefixing the option name with 'no-'. Available options are: allow-failsafe If the 'failsafe' argument is passed to the Xsession script, an emergency X session is invoked, consisting of only an x-termi- nal-emulator(1) in the upper-left hand corner of the screen. No window manager is started. If an x-terminal-emulator program is not available, the session exits immediately. allow-user-resources If users have a file called .Xresources in their home directories, these resources will be merged with the default X resources when they log in. allow-user-xsession If users have an executable file called .xsession in their home directories, it can be used as the startup program for the X session (see Xsession(5)). If the file is present but not executable, it may still be used, but is assumed to be a Bourne shell script, and executed with sh(1). use-session-dbus If the dbus package is installed, the session bus will be activated at X session launch. use-ssh-agent If the ssh-agent(1) program is available and no agent process appears to be running already, the X session will be invoked by exec'ing ssh-agent with the startup command, instead of the startup command directly. All of the above options are enabled by default. Additional options may be supported by the local administrator. Xsession(5) describes how this is accomplished. AUTHORS
Stephen Early, Mark Eichin, and Branden Robinson developed Debian's X session handling scripts. Branden Robinson wrote this manual page. SEE ALSO
Xsession(5), ssh-agent(1), x-terminal-emulator(1) Debian Project 2004-10-31 Xsession.options(5)
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