Portál AbcLinuxu, 23. dubna 2024 05:21
Řešení dotazu:
man bash
pak napiš*:
/HIST
A kochej se*:
...
HISTCONTROL
A colon-separated list of values controlling how commands are saved on the history list. If the list of
values includes ignorespace, lines which begin with a space character are not saved in the history list. A
value of ignoredups causes lines matching the previous history entry to not be saved. A value of ignoreboth
is shorthand for ignorespace and ignoredups. A value of erasedups causes all previous lines matching the
current line to be removed from the history list before that line is saved. Any value not in the above list
is ignored. If HISTCONTROL is unset, or does not include a valid value, all lines read by the shell parser
are saved on the history list, subject to the value of HISTIGNORE. The second and subsequent lines of a
multi-line compound command are not tested, and are added to the history regardless of the value of HISTCON‐
TROL.
HISTFILE
The name of the file in which command history is saved (see HISTORY below). The default value is
~/.bash_history. If unset, the command history is not saved when a shell exits.
HISTFILESIZE
The maximum number of lines contained in the history file. When this variable is assigned a value, the his‐
tory file is truncated, if necessary, to contain no more than that number of lines by removing the oldest
entries. The history file is also truncated to this size after 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 HISTSIZE after reading any startup
files.
HISTIGNORE
A colon-separated list of patterns used to decide which command lines should be saved on the history list.
Each pattern is anchored at the beginning of the line and must match the complete line (no implicit `*' is
appended). Each pattern is tested against the line after the checks specified by HISTCONTROL are applied.
In addition to the normal shell pattern matching characters, `&' matches the previous history line. `&' may
be escaped using a backslash; the backslash is removed before attempting a match. The second and subsequent
lines of a multi-line compound command are not tested, and are added to the history regardless of the value
of HISTIGNORE.
HISTSIZE
The number of commands to remember in the command history (see HISTORY below). If the value is 0, commands
are not saved in the history list. Numeric values less than zero result in every command being saved on the
history list (there is no limit). The shell sets the default value to 500 after reading any startup files.
HISTTIMEFORMAT
If this variable is set and not null, its value is used as a format string for strftime(3) to print the time
stamp associated with each history entry displayed by the history builtin. If this variable is set, time
stamps are written to the history file so they may be preserved across shell sessions. This uses the his‐
tory comment character to distinguish timestamps from other history lines.
...
*) Výsledek se může lišit
# smaze historii nactenou v aktualni konzoli, na disku v ~/.bash_history ji ale nechava history -c # ulozi aktualni historii (po predchozim smazani tedy prazdnou) na disk do ~/.bash_history history -w # napoveda pro history, ktera je soucast bash a proto nelze zobrazit pres 'history --help' help history
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