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| If `cmdhist` is enabled and command history is enabled, multi-line commands are collapsed to a single line when saving into history. | If `cmdhist` is enabled and command history is enabled, multi-line commands are collapsed to a single line when saving into history. This is enabled by default. |
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| This is enabled by default. | If `histappend` is set, the history file is ''appended to'' rather than ''overwritten'' when the shell exits. If `histreedit` is set and `readline(3)` is available, history can be re-editted. If `histverify` is set, when a command is expanded with history substitution, the prompt reloads with the updated content (as opposed to the shell executing the updated command immediately). |
Bash Shell Options
A POSIX compliant shell can be configured with the set and unset builtins. To inspect the enabled options, use the $SHELLOPTS shell variable.
bash(1) expands on the set of configuration options. These options are set with the shopt builtins. To inspect the enabled options, use the $BASHOPTS shell variable.
Contents
Aliases
If expand_aliases is enabled, aliases are expanded.
By default, this is enabled for interactive shells.
Compatibility Levels
bash(1) 4 introduced compatibility levels, wherein the behavior of the shell are modified.
shopt -e compat31
The modes available through the shopt builtin are:
compat31
compat32
compat40
compat41
compat42
compat43
compat44
A shell only has one compatibility level, so each mode is mutually exclusive.
From bash(1) 4.3+, use of the $BASH_COMPAT shell variable is preferred.
Extended Debugging Mode
extdebug
History
If cmdhist is enabled and command history is enabled, multi-line commands are collapsed to a single line when saving into history. This is enabled by default.
If histappend is set, the history file is appended to rather than overwritten when the shell exits.
If histreedit is set and readline(3) is available, history can be re-editted.
If histverify is set, when a command is expanded with history substitution, the prompt reloads with the updated content (as opposed to the shell executing the updated command immediately).
Quoting
If extquote is enabled, ANSI quoting and local translation quoting are performed within parameter expansion.
This is enabled by default.
Window Size
If checkwinsize is enabled, bash(1) checks the window size after every (non-builtin) command. This triggers updates to the $LINES and $COLUMNS shell variables.
By default, this is enabled for interactive shells.