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documentation updates for history builtin to note it does not truncate the history file; documentation updates for HISTFILESIZE noting that it can work on lines or history entries depending on $HISTTIMEFORMAT; documentation update for history saving behavior at shell exit; history -w and history -a should update the number of history entries in the current session if they are using $HISTFILE; history -r now updates the number of history entries in the current session; improvement to history_truncate_file so it leaves fewer partial history entries when operating on lines

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Chet Ramey
2026-08-28 15:35:54 -04:00
parent 71327ab3b5
commit 81ddb6474b
16 changed files with 2086 additions and 1840 deletions
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doc/bashref.texi
+16 -10
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@@ -6560,7 +6560,8 @@ message format.
@item histappend
If set, the history list is appended to the file named by the value
of the @env{HISTFILE}
variable when the shell exits, rather than overwriting the file.
variable when the shell exits, rather than
potentially overwriting the file.
@item histreedit
If set, and Readline is being used,
@@ -7407,17 +7408,22 @@ If @env{HISTFILE} is unset or null,
the shell does not save the command history when it exits.
@item HISTFILESIZE
The maximum number of lines contained in the history file.
When this variable is assigned a value, the history file is truncated,
if necessary, to contain no more than
the number of history entries
that total no more than that number of lines
The maximum number of lines or history entries contained in the history file.
When this variable is assigned a value,
the history file is truncated, if necessary,
to contain no more than
that number of history entries or lines,
depending on the value of @env{HISTTIMEFORMAT},
by removing the oldest entries.
If the history list contains multi-line entries,
the history file may contain more lines than this maximum
to avoid leaving partial history entries.
@xref{Bash History Facilities},
for a description of how
@env{HISTTIMEFORMAT}
affects how the value is treated and
whether it refers to lines or history entries.
The history file is also truncated to this size after
writing it when a shell exits or by the @code{history} builtin.
writing it when a shell exits.
If the value is 0, the history file is truncated to zero size.
Non-numeric values and numeric values less than zero inhibit truncation.
The shell sets the default value to the value of @env{HISTSIZE}