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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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sh(1)							      General Commands Manual							     sh(1)

NAME
sh - overview of various system shells SYNOPSIS
POSIX Shell option] ... string] [arg ...] option] ... string] [arg ...] Korn Shell option] ... string] [arg ...] option] ... string] [arg ...] C Shell [command_file] [argument_list ...] Key Shell DESCRIPTION
Remarks The POSIX .2 standard requires that, on a POSIX-compliant system, executing the command activates the POSIX shell (located in file on HP-UX systems), and executing the command produces an on-line manual entry that displays the syntax of the POSIX shell command-line. However, the command has historically been associated with the conventional Bourne shell, which could confuse some users. To meet stan- dards requirements and also clarify the relationships of the various shells and where they reside on the system, this entry provides com- mand-line syntax and a brief description of each shell, and lists the names of the manual entries where each shell is described in greater detail. The Bourne shell is removed from the system starting with HP-UX 11i Version 1.5. Please use the POSIX shell as an alternative. Shell Descriptions The HP-UX operating system supports the following shells: POSIX-conforming command programming language and command interpreter residing in file Can execute commands read from a terminal or a file. This shell conforms to current POSIX standards in effect at the time the HP-UX system release was introduced, and is similar to the Korn shell in many respects. Similar in many respects to the Korn shell, the POSIX shell contains a history mechanism, supports job control, and provides various other useful features. Korn-shell command programming language and commands interpreter residing in file Can execute commands read from a terminal or a file. This shell, like the POSIX shell, contains a his- tory mechanism, supports job control, and provides various other useful features. A command language interpreter that incorporates a command history buffer, C-language-like syntax, and job control facilities. Restricted version of the POSIX shell command interpreter. Sets up a login name and execution environment whose capabilities are more controlled (restricted) than normal user shells. restricted version of the Korn-shell command interpreter Sets up a login name and execution environment whose capabilities are more controlled (restricted) than normal user shells. An extension of the standard Korn Shell that uses hierarchical softkey menus and context-sensitive help. +--------------+--------------------+ | To obtain: | Use the command: | +--------------+--------------------+ | POSIX Shell | /usr/bin/sh ... | | Korn Shell | /usr/bin/ksh ... | | C Shell | /usr/bin/csh ... | | Key Shell | /usr/bin/keysh | +--------------+--------------------+ These shells can also be the default invocation, depending on the entry in the file. See also chsh(1). WARNINGS
Many manual entries contain descriptions of shell behavior or describe program or application behavior similar to ``the shell'' with a ref- erence to ``see sh(1)''. SEE ALSO
For more information on the various individual shells, see: keysh(1) Key Shell description. ksh(1) Korn Shell description. sh-posix(1) POSIX Shell description. csh(1) C Shell description. sh(1)
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