Manual §4 Editing

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4. Command-line editing

4.1 Insertion

Key combination	Widget	Description
__defchar__	self-insert	Insert the character
M-C-m, M-RET (Emacs)	newline	Insert a newline
C-q, C-v	quoted-insert	Insert the next key-input characters literally
insert	overwrite-mode	Toggle insert and overwrite mode
paste_begin	bracketed-paste	Start Bracketed Paste Mode
__batch_char__	batch-insert	Insert characters in a batch

4.2 Selection

There is another recorded position called mark in addition to the current position. When ble.sh is in the selection state, the text between the current position and mark is considered the selected region.

Key combination	Widget	Description
C-@, C-SP, NUL M-SP (Emacs)	set-mark	Set a mark and start selection
C-x C-x	exchange-point-and-mark	Exchange the current position and the mark
C-w	kill-region-or kill-backward-uword	Cut the current selection or uword (see below)
M-w (Emacs)	copy-region-or copy-backward-uword	Copy the current selection or uword (see below)
C-y	yank	Paste

4.3 Characterwise movement and operation

Key combination	Widget	Description
C-f, right	@nomarked forward-char	Go to the next character
C-b, left	@nomarked backward-char	Go to the previous character
S-C-f, S-right	@marked forward-char	Go to the next character with selection
S-C-b, S-left	@marked backward-char	Go to the previous character with selection
C-d, delete	delete-region-or delete-forward-char	Delete the current selection or the next character
C-?, DEL, C-h, BS	delete-region-or delete-backward-char	Delete the current selection or the previous character
C-t	transpose-chars	Exchange the next and previous characters
C-] (Emacs)	character-search-forward	Search a character forward
M-C-] (Emacs)	character-search-backward	Search a character backward

4.4 Wordwise movement and operation

There are five types of words in ble.sh. eword is an English word consists of alphabets and digits. cword is a C word consists of alphabets, digits and underscores. uword is a Unix word consists of non-space characters which are not in the shell variable IFS. sword is a shell word consists of characters which are not spaces or special characters of the shell. fword is a filename consists of characters which are not spaces or slashes.

The following table shows the operations related to cword which have default bindings.

Key combination	Widget	Description
C-right M-f (Emacs)	@nomarked forward-cword	Go to the beginning of the next cword
C-left M-b (Emacs)	@nomarked backward-cword	Go to the end of the previous cword
S-C-right M-S-f, M-F (Emacs)	@marked forward-cword	Go to the beginning of the next cword with selection
S-C-left M-S-b, M-B (Emacs)	@marked backward-cword	Go to the end of the previous cword with selection
M-d (Emacs)	kill-forward-cword	Cut the next cword
M-h (Emacs)	kill-backward-cword	Cut the previous cword
C-delete	delete-forward-cword	Delete the next cword
C-_, C-DEL, C-BS	delete-backward-cword	Delete the previous cword

The following table shows the operations related to sword.

Key combination	Widget	Description
M-right (Emacs)	@nomarked forward-sword	Go to the beginning of the next cword
M-left (Emacs)	@nomarked backward-sword	Go to the end of the previous cword
M-S-right (Emacs)	@marked forward-sword	Go to the beginning of the next cword with selection
M-S-left (Emacs)	@marked backward-sword	Go to the end of the previous cword with selection
M-delete (Emacs)	copy-forward-sword	Copy the next cword
M-C-?, M-DEL, M-C-h, M-BS (Emacs)	copy-backward-sword	Copy the previous cword

The following table shows the operations related to eword.

Key combination	Widget	Description
M-c (Emacs)	capitalize-eword	Capitalize until the end of the next eword
M-l (Emacs)	downcase-eword	Convert to lowercase until the end of the next eword
M-u (Emacs)	upcase-eword	Convert to uppercase until the end of the next eword

There is an operation related to the spaces as well.

Key combination	Widget	Description
M-\ (Emacs)	delete-horizontal-space	Delete spaces around the current position

4.5 Linewise movement and operation

Key combination	Widget	Description
C-a, home	@nomarked beginning-of-line	Go to the beginning of line
C-e, end	@nomarked end-of-line	Go to the end of line
S-C-a, S-home	@marked beginning-of-line	Go to the beginning of line with selection
S-C-e, S-end	@marked end-of-line	Go to the end of line with selection
M-m (Emacs)	@nomarked non-space-beginning-of-line	Go to the non-space beginning of line
M-S-m, M-M (Emacs)	@marked non-space-beginning-of-line	Go to the non-space beginning of line with selection
C-k	kill-forward-line	Delete the range between the current position and the end of line
C-u	kill-backward-line	Delete the range between the current position and the beginning of line
S-C-p, S-up	@marked backward-line	Go to the previous line with selection
S-C-n, S-down	@marked forward-line	Go to the next line with selection

4.6 Beginning and end of command line

Key combination	Widget	Description
C-home	@nomarked beginning-of-text	Go to the beginning of text
C-end	@nomarked end-of-text	Go to the end of text
S-C-home	@marked beginning-of-text	Go to the beginning of text with selection
S-C-end	@marked end-of-text	Go to the end of text with selection

4.7 Keyboard macros

Key combination	Widget	Description
C-x (	start-keyboard-macro	Start recording of the macro
C-x )	end-keyboard-macro	End recording of the macro
C-x e	call-keyboard-macro	Replay the macro
C-x P	print-keyboard-macro	Display the macro

4.8 History

Key combination	Widget	Description
C-prior M-< (Emacs)	history-beginning	Go to the first history entry
C-next M-> (Emacs)	history-end	Go to the last history entry
C-p, up	@nomarked backward-line history	Go to the previous line or the previous history entry
C-n, down	@nomarked forward-line history	Go to the next line or the next history entry

4.9 Incremental search (isearch)

The incremental search can be started by the following commands.

Key combination	Widget	Description
C-r	history-isearch-backward	Start incremental search forward
C-s	history-isearch-forward	Start incremental search backward

In the incremental search mode, the following key bindings are available:

Key combination	Widget	Description
__defchar__	isearch/self-insert	Append to search target
C-r	isearch/backward	Search forward
C-s	isearch/forward	Search backward
C-?, DEL, C-h, BS	isearch/prev	Go back to the previous search state
__default__	isearch/exit-default	Exit the search and do default
C-g	isearch/cancel	Cancel the search and restore the state before the search
C-m, RET	isearch/exit	Exit the search
C-j, C-RET	isearch/accept-line	Exit the search and execute RET
C-d	isearch/exit-delete-forward-char	Exit the search and delete a forward character

4.10 Non-incremental search (nsearch)

The non-incremental search can be started by the following commands.

Key combination	Widget	Description
C-x C-p, C-x up	history-search-backward	Start non-incremental prefix-search in forward direction with the string before the current position
C-x C-n, C-x down	history-search-forward	Start non-incremental prefix-search in backward direction backward with the string before the current position
C-x p	history-substring-search-backward	Start non-incremental substring-search in forward direction with the string before the current position
C-x n	history-substring-search-forward	Start non-incremental substring-search in backward direction backward with the string before the current position
C-x <	history-nsearch-backward	Start non-incremental prefix-search in forward direction with a user-provided string
C-x >	history-nsearch-forward	Start non-incremental prefix-search in backward direction backward with a user-provided string

In the non-incremental search mode, the following key bindings are available:

Key combination	Widget	Description
C-r, C-p, up	nsearch/backward	Search forward
C-s, C-n, down	nsearch/forward	Search backward
C-g	nsearch/cancel	Cancel the current search
C-m, RET	nsearch/exit	Exit the current search
C-j, C-RET	nsearch/accept-line	Exit the current search and execute RET
__default__	nsearch/exit-default	Exit the current search and do default

4.10.1 Widget history-search^†

SYNOPSIS

  history-search OPTS
  history-search-backward OPTS
  history-search-forward OPTS
  history-substring-search-backward OPTS
  history-substring-search-forward OPTS
  history-nsearch-backward OPTS
  history-nsearch-forward OPTS
  history-nsearch-backward-again OPTS
  history-nsearch-forward-again OPTS

OPTS is a colon-separated list of

  backward, forward, substr, input, again, hide-status, immediate-accept
  action=ACTION, point=POINT, empty=EMPTY

ACTION

  goto, load

POINT

  begin, end, match-begin, match-end

EMPTY

  empty-search, previous-search, hide-status, history-move

• history-search-forward OPTS is a synonym of history-search forward:OPTS
• history-search-backward OPTS is a synonym of history-search backward:OPTS
• history-substring-search-forward OPTS is a synonym of history-search forward:substr:OPTS
• history-substring-search-backward OPTS is a synonym of history-search backward:substr:OPTS
• history-nsearch-forward OPTS is a synonym of history-search forward:input:OPTS
• history-nsearch-backward OPTS is a synonym of history-search backward:input:OPTS
• history-nsearch-forward-again OPTS is a synonym of history-search forward:again:OPTS
• history-nsearch-backward-again OPTS is a synonym of history-search backward:again:OPTS

These widgets search a target string from the command history. By default, the string before the cursor in the command line is used as the target string. The target string may be input by the user using OPTS input or again (see below). By default, the history entries that start from the target string are searched. The history entries that contain the target string may be searched using OPTS substr (see below).

OPTS is a colon-separated list of the following fields:

• backward (default) ... Start searching in forward direction, i.e., searching for older history entries.
• forward ... Start searching in forward direction, i.e., searching for newer history entries.
• substr ... Find history entries that contains the target string.
• input ... Prompt the user to input the target string.
• again ... Use the target string previously input by the user.
• hide-status ... Do not show the nsearch status of (nsearch #N: << !M >>) `NEEDLE'.
• immediate-accept ... The widget nsearch/exit---which is defautly bound to C-m and RET---immediately runs the command.
• action=ACTION ... Specify the type of action taken when the search string is matched to a history entry. ACTION is one of the following values:
  • goto (default) ... Go to the history entry.
  • load ... Load the text of the history entry without moving the current history position. This is Bash's default behavior.
• point=POINT ... Specify the cursor position after the action. POINT is one of the following values:
  • begin ... the beginning of the command line
  • end ... the end of the command line
  • match-begin ... the beginning of the matched part
  • match-end (default) ... the end of the matched part
• empty=EMPTY ... Specify the special treatment on the empty command search.
  • empty-search (default) ... Start nsearch with an empty string.
  • hide-status ... Start nsearch with an empty string but do not show the nsearch status.
  • previous-search ... Start nsearch with the previous search string.
  • history-move ... Go to the previous/next history entry without starting the nsearch. The cursor position is set to the beginning of the command line to keep the string before the cursor empty.

4.11 Insert words in history (lastarg)

Key combination	Widget	Description
M-., M-_ (Emacs)	insert-last-argument	Insert the last argument of the previous command
C-M-y (Emacs)	insert-nth-argument	Insert the N[1]th argument of the previous command

ble.sh enters the lastarg mode on the widget insert-last-argument. In the lastarg mode, the following bindings are available.

Key combination	Widget	Description
__default__	lastarg/exit-default	Exit the lastarg mode and do the default
C-g, C-x C-g, C-M-g (Emacs)	lastarg/cancel	Delete the current word and cancel the lastarg mode
M-., M-_ (Emacs)	lastarg/next	Go to the last argument of the N[1] entries before in history
M-C-u	universal-arg	Start and end the argument input
M--, M-0, M-1, M-2, M-3, M-4, M-5, M-6, M-7, M-8, M-9 (Emacs)	append-arg-or lastarg/exit-default	Set the argument
C--, C-0, C-1, C-2, C-3, C-4, C-5, C-6, C-7, C-8, C-9	append-arg-or lastarg/exit-default	Set the argument
-, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 (Emacs)	append-arg-or lastarg/exit-default	Set the argument

4.12 Prompt string

In ble.sh, prompt string can be specified for various places such as PS1, PS2, PS0, bleopt prompt_rps1, read -p. In addition to the standard Bash escape sequences of the form \..., there are also a few extensions.

4.12.1 Prompt sequence \g{GSPEC} (v0.4)

Graphic attributes can be specified by gspec format.

# Example
PS1='[\g{bold,fg=green}\u\g{none}@\g{bold,fg=navy}\h\g{none}]\$ '

4.12.2 User-defined prompt sequences

function ble/prompt/backslash:X {
  ble/prompt/print STRING
  ble/prompt/process-prompt-string PROMPT_STRING
  ble/prmopt/unit/add-hash '$VARNAME'
}
PS1='[\X]\$ '

In addition to the prompt sequences defined by Bash, user-defined sequences can be added and specified in the prompt string. A sequence \X can be defined by creating a shell function named ble/prompt/backslash:X. In the shell function, the string to be inserted in the prompt can be added by calling ble/prompt/print STRING or ble/prompt/process-prompt-string PROMPT_STRING. The former form inserts the literal argument in the prompt while the latter processes the argument as another prompt string, i.e., the prompt sequences and shell expansions in the argument will be processed. By calling ble/prompt/unit/add-hash '$VARNAME', the dependencies of the expanded results on arbitrary variables can be declared. The corresponding prompts will be automatically updated on the variable changes.

The prompt sequence \q{NAME ARGS...} (v0.4) can be used to call the long-name prompt sequence with arguments. This prompt sequence is processed by calling the shell function ble/prompt/backslash:NAME ARGS....

# Example: User-defined sequence "hello"
function ble/prompt/backslash:hello {
  ble/prompt/print "Hello, ${1:-world}!"
}
PS1='[\q{hello $USER}]\$ '

4.13 Prompts

In addition to the standard prompts of Bash, such as PS1, PS2, PS0, additional prompts listed in this section are also available in ble.sh. See also the editing-mode specific prompts:

• bleopt prompt_emacs_mode_indicator
• bleopt prompt_vi_mode_indicator

4.13.1 Bleopt prompt_rps1 (Prompt string) (v0.3)^†

# default
bleopt prompt_rps1= # ble-0.4
bleopt rps1=        # ble-0.3 (obsolete)

The option sets the right prompt.

# Example: show current time
bleopt prompt_rps1='\t'

4.13.2 Bleopt prompt_ps1_final (Prompt string) (v0.4)^†

# default
bleopt prompt_ps1_final=

When a non-empty value is specified, the prompt is replaced by this value before leaving the current command line.

4.13.3 Bleopt prompt_ps1_transient (Colon-separated list) (v0.4)^†

# default
bleopt prompt_ps1_transient=

This is a colon-separated list of always, same-dir and trim. When prompt_ps1_final is empty and this option has a non-empty value, the prompt specified by PS1 is erased on leaving the current command line. If the value contains a field trim, only the last line of multiline PS1 is preserved and the other lines are erased. Otherwise, the command line will be redrawn as if PS1= is specified. When a field same-dir is contained in the value and the current working directory is different from the final directory of the previous command line, this option prompt_ps1_transient is ignored.

4.13.4 Bleopt prompt_rps1_final (Prompt string) (v0.4)^†

# default
bleopt prompt_rps1_final=

When a non-empty value is specified, the right prompt is replaced by this value before leaving the current command line.

4.13.5 Bleopt prompt_rps1_transient (Empty/Non-empty) (v0.3)^†

# default
bleopt prompt_rps1_transient= # ble-0.4
bleopt rps1_transient=        # ble-0.3 (obsolete)

When prompt_rps1_final is empty and this option has a non-empty value, the right prompt specified by bleopt option prompt_rps1 is erased before going to a new line.

4.13.6 Bleopt prompt_xterm_title (Prompt string) (v0.4)^†

# default
bleopt prompt_xterm_title=

When a non-empty value is specified, the title of the termiinal is replaced by the specified string using OSC 0 ; ... BEL just before showing PS1.

4.13.7 Bleopt prompt_screen_title (Prompt string) (v0.4)^†

# default
bleopt prompt_screen_title=

This option is only effective inside terminal multiplexers such as GNU screen and tmux. When a non-empty value is specified, the window title of the terminal multiplexer is replaced by the specified string using ESC k ... ST just before showing PS1.

4.13.8 Bleopt prompt_term_status (Prompt string) (v0.4)^†

# default
bleopt prompt_term_status=

This option is only effective when terminfo entries tsl and fsl (or termcap entries ts and ds) are available. When a non-empty value is specified, the content of the status line is replaced using terminfo just before showing PS1.

4.13.9 Bleopt prompt_status_line (Prompt string) (v0.4)^†

# default
bleopt prompt_status_line=

This option specifies the content of the status line which would be shown at the bottom line of the terminal. When the evaluated value is empty, the status line is disabled.

4.13.10 Bleopt prompt_status_align (Enumerable) (v0.4)^†

# default
bleopt prompt_status_align=$'justify=\r'

This option specifies the position of the content of the status line. The values left, right, center, or justify=CHAR can be specified. When justify=CHAR (where CHAR is a user-specified character) is set, the expanded results are split by the character CHAR and arranged to fill the line just like the text justification.

4.13.11 Face prompt_status_line (v0.4)^†

# default
ble-face prompt_status_line='fg=231,bg=240'

This face specifies the background face of the status line.

4.14 Settings for editing and executing commands

4.14.1 Bleopt indent_offset (Arithmetic) (v0.2)^†

# default
bleopt indent_offset=4

This option specifies the unit width of indentation.

4.14.2 Bleopt indent_tabs (Arithmetic) (v0.2)^†

# default
bleopt indent_tabs=1

This option controls whether tabs are used for indentation or not. If 0 is specified, indentation will be made with only spaces, or otherwise tabs are also used for indentation.

4.14.3 Bleopt edit_forced_textmap (Arithmetic) (v0.2)^†

# default
bleopt edit_forced_textmap=1

This option controls the usage of the layout information for the operations such as movement up, down. If this option has the value 0, the layout information is used only when it is up to date. Otherwise, when the layout information is out of date, it is updated to be used for the operations.

4.14.4 Bleopt edit_line_type (Enumerable) (v0.4)^†

# default
bleopt edit_line_type=logical

This option controls the interpretation of lines when going to the beginning or the end of the current line. When the value logical is specified, the logical line is used, i.e., the beginning and the end of the line is determined based on the newline characters in the edited text. When the value graphical is specified, the graphical line is used, i.e., the beginning and the end of the displayed line in the terminal is used.

4.14.5 Bleopt delete_selection_mode (Empty/Non-empty) (v0.2)^†

# default
bleopt delete_selection_mode=1

This option controls the behavior of insertion when the selection is activated. If this option has a non-empty value, the contents of the selection is deleted before characters are inserted. If this option is empty, the selection is cleared before characters are inserted.

4.14.6 Bleopt undo_point (v0.2)^†

# default
bleopt undo_point=end

This option specifies the cursor position after undo. If the value is end, the cursor is moved to the end of the dirty section. If the value is beg, the cursor is moved to the beginning of the dirty section. Otherwise, the cursor position is restored to the original position when the state is recorded.

4.14.7 Bleopt history_preserve_point (Empty/Non-empty)^†

# default
bleopt history_preserve_point=

This option specifies the cursor position after the move between the history entries. If a non-empty value is specified, ble.sh tries to preserve the position. When the string after the move is shorter than the original position, the cursor position is moved to the end of text. If the value is empty, the cursor position is moved to the end of text when it moved to the older history entry, or the beginning of text when it moved to the recent history entry.

4.14.8 Bleopt term_cursor_external (Arithmetic) (v0.2)^†

# default
bleopt term_cursor_external=0

This option controls the cursor shape when external commands are executed. The value is specified with the parameter of DECSCUSR. It is enabled when terminfo (or termcap) has the entry Ss. If your terminal actually supports DECSCUSR even though it is not shown up in terminfo, please add the following setting to ~/.blerc.

_ble_term_Ss=$'\e[@1 q'

4.14.9 Bleopt allow_exit_with_jobs (Empty/Non-empty) (v0.3)^†

# default
bleopt allow_exit_with_jobs=

If the value is empty, the shell will not exit with delete-forward-char-or-exit (defaultly to which C-d is bounded) when there are remaining jobs. If a non-empty value is specified, the shell exits even if there are remaining jobs.

4.14.10 Bleopt prompt_eol_mark (ANSI escape sequences) (v0.3)^†

# default
bleopt prompt_eol_mark=$'\e[94m[ble: EOF]\e[m'

This option specifies the string when the command did not end at the beginning of line in the terminal.

4.14.11 Bleopt prompt_ruler (Empty/Enumerate/ANSI escape sequences) (v0.4)^†

# default
bleopt prompt_ruler=

This option specifies the ruler between the previous command and the prompt (like powerlevel10k POWERLEVEL9K_PROMPT_{ADD_NEWLINE,SHOW_RULER,RULER_*}). When the empty value is specified, the ruler is disabled. This is the default. When the value empty-line is specified, an empty line is inserted between the command and the prompt. When the other values are specified, the value is interpreted as an ANSI sequences, and the result is repeated to fill a line.

4.14.12 Bleopt prompt_command_changes_layout (Empty/Non-empty) (v0.4)^†

# default
bleopt prompt_command_changes_layout=

This option specifies whether the commands called from the blehook PRECMD or the variable PROMPT_COMMAND output texts to the terminal and changes the layout. When a non-empty value is specified, ble.sh resets the layout before running the hooks PRECMD and PROMPT_COMMAND and restores the layout after running the hooks. When a empty value is specified, ble.sh assumes that these hooks do not output texts to the terminal and do not changes the cursor positions and skip the special treatment.

4.14.13 Bleopt exec_errexit_mark (ANSI escape sequences) (v0.4)^†

# default
bleopt exec_errexit_mark=$'\e[91m[ble: exit %d]\e[m'

This option specifies the string printed when the command exited with non-zero exit status. When the value is empty, the exit status line will not be shown.

4.14.14 Bleopt exec_elapsed_mark (ANSI escape sequences) (v0.4)^†

# default
bleopt exec_elapsed_mark=$'\e[94m[ble: elapsed %s (CPU %s%%)]\e[m'

This option specifies the format of the command execution time report. The format takes two arguments: the first is the string that explains the elapsed time, and the second is a number that represents the percentage of CPU core usage.

4.14.15 Bleopt exec_elapsed_enabled (Arithmetic) (v0.4)^†

# default
bleopt exec_elapsed_enabled='usr+sys>=10000'

This option specifies the condition that the command execution time report is displayed after the command execution. The condition is specified by an arithmetic expression, where a non-zero result causes displaying the report. In the arithmetic expression, variables real, {usr,sys}{,_self,_child}, and cpu can be used. real represents the elapsed time. usr and sys represent the user and system time, respectively. The suffixes _self and _child represent the part consumed in the main shell process and the other child processes including subshells and external programs, respectively. cpu represents the percentage of the CPU core usage in integer, which can be calculated by (usr+sys)*100/real. The other time values are all in unit of milliseconds.

4.14.16 Bleopt history_share (Empty/Non-empty) (v0.4)^†

# default
bleopt history_share=

When this option has a non-empty value, the history is synchronized to $HISTFILE every time a command is executed.

4.14.17 Bleopt info_display (Enumerable) (v0.4)^†

# default
bleopt info_display=top

This option controls the position of the info pane where completion menu, mode names, and other information are shown. When the value top is specified, the info pane is shown just below the command line. When the value bottom is specified, the info pane is shown at the bottom of the terminal.

4.14.18 Bleopt accept_line_threshold (Arithmetic) (v0.4)^†

# default
bleopt accept_line_threshold=5

This option controls the behavior of widget accept-single-line-or-newline in the single-line mode. If this option is evaluated to a negative integer, the command is always executed. If this option is evaluated to 0, the widget inserts a newline when there is unprocessed user inputs. If this option is evaluated to a positive integer n, the widget inserts a newline when there is n or more user inputs.

4.14.19 Bleopt line_limit_type (Enumerable) (v0.4)^†

# default
bleopt line_limit_type=none

This option controls the behavior when the number of characters exceeds the capacity specified by line_limit_length. The value none means that the number of characters will not be checked. The value discard means that the characters cannot be inserted when the number of characters exceeds the capacity. The value truncate means that the command line is truncated from its end to fit into the capacity. The value editor means that the widget edit-and-execute will be invoked to open an editor to edit the command line contents.

4.14.20 Bleopt line_limit_length (Arithmetic) (v0.4)^†

# default
bleopt line_limit_length=10000

This option specifies the capacity of the command line in the number of characters. The number 0 or negative numbers means the unlimited capacity.

4.14.21 Bleopt history_limit_length (Arithmetic) (v0.4)^†

# default
bleopt history_limit_length=10000

This option specifies the maximal number of characters which can be appended into the history. When this option has a positive value, commands with the length longer than the value is not appended to the history. When this option has a non-positive value, commands are always appended to the history regardless of their length.

4.14.22 Bleopt history_erasedups_limit (Empty/Arithmetic) (v0.4)^†

# default
bleopt history_erasedups_limit=0

This option controls the target range in the command history for erasedups, which is performed when it is specified in HISTCONTROL. When this option has an empty value, the target range is the entire history as in the plain Bash. When this option evaluates to a positive integer count, the target range is the last count entries in the command history. When this option evaluates to a non-positive integer offset, offset specifies the beginning of the target range relative to the history count at the session start. The end of the target range is always the end of the command history.

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