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List of shell options
This information was taken from a Bash version "4.1", every now and
then new options are added, so likely, this list isn't complete.
The shell-options can be set with the shopt builtin command.
Shell options
autocd
Option: autocd Since: 4.0-alpha
Shell mode: interactive only Default: off
If set, a command name that is the name of a directory is executed as if it were the argument to the cd command.
assoc_expand_once
Option: assoc_expand_once Since: 5.0-alpha
Shell mode: all Default: off
If set, Bash attempts to expand associative array options only once.
cdable_vars
Option: cdable_vars Since: unknown
Shell mode: all Default: off
Treat every non-directory argument to the cd-command as variable
name containing a directory to cd into.
cdspell
Option: cdspell Since: unknown
Shell mode: interactive only Default: off
If set, minor errors in the spelling of a directory component in a cd command will be corrected. The errors checked for are transposed characters, a missing character, and one character too many. If a correction is found, the corrected file name is printed, and the command proceeds.
checkhash
Option: checkhash Since: unknown
Shell mode: all Default: off
If set, Bash checks that a command found in the hash table exists before trying to execute it. If a hashed command no longer exists, a normal path search is performed.
checkjobs
Option: checkjobs Since: 4.0-alpha
Shell mode: interactive only Default: off
If set, Bash lists the status of any stopped and running jobs before exiting an interactive shell. If any jobs are running, this causes the exit to be deferred until a second exit is attempted without an intervening command. The shell always postpones exiting if any jobs are stopped.
checkwinsize
Option: checkwinsize Since: unknown
Shell mode: all Default: on
If set, Bash checks the window size after each command and, if necessary, updates the values of the variables LINES and COLUMNS.
cmdhist
Option: cmdhist Since: unknown
Shell mode: all Default: off
If set, Bash attempts to save all lines of a multiple-line command in the same history entry. This allows easy re-editing of multi-line commands.
compat31
Option: compat31 Since: 3.2
Shell mode: all Default: off
Compatiblity mode for Bash 3.1
compat32
Option: compat32 Since: 4.0
Shell mode: all Default: off
Compatiblity mode for Bash 3.2
compat40
Option: compat40 Since: 4.1-beta
Shell mode: all Default: off
Compatiblity mode for Bash 4.0
compat41
Option: compat41 Since: 4.2-alpha
Shell mode: all Default: off
Compatiblity mode for Bash 4.1
compat42
Option: compat42 Since: 4.3-alpha
Shell mode: all Default: off
Compatiblity mode for Bash 4.2
compat43
Option: compat43 Since: 4.4-alpha
Shell mode: all Default: off
Compatiblity mode for Bash 4.3
compat44
Option: compat44 Since: 5.0-alpha
Shell mode: all Default: off
Compatiblity mode for Bash 4.4
direxpand
Option: direxpand Since: 4.3-alpha
Shell mode: all Default: off (unless changed on compile-time with --enable-direxpand-default)
If set, bash replaces directory names with the results of word expansion when performing filename completion. This changes the contents of the readline editing buffer. If not set, bash attempts to preserve what the user typed.
dirspell
Option: dirspell Since: 4.0-alpha
Shell mode: all Default: off
If set, Bash will perform spelling corrections on directory names to match a glob.
dotglob
Option: dotglob Since: unknown
Shell mode: all Default: off
If set, Bash includes filenames beginning with a . (dot) in the
results of pathname expansion.
execfail
Option: execfail Since: unknown
Shell mode: non-interactive Default: off
If set, a non-interactive shell will not exit if it cannot execute the
file specified as an argument to the exec-builtin command. An
interactive shell does not exit if exec fails.
expand_aliases
Option: expand_aliases Since: unknown
Shell mode: all Default: on (interactive), off (non-interactive)
If set, aliases are expanded. This option is enabled by default for interactive shells.
extdebug
Option: extdebug Since: 3.0-alpha
Shell mode: all Default: off
If set, behavior intended for use by debuggers is enabled.
extglob
Option: extglob Since: 2.02-alpha1
Shell mode: all Default: off
If set, the extended pattern matching features are enabled. See the important note below under Parser configurations.
extquote
Option: extquote Since: 3.0-alpha (?)
Shell mode: all Default: on
If set, $'string' and $"string" quoting is performed within
parameter expansions enclosed in double quotes. See the
important note below under Parser
configurations.
failglob
Option: failglob Since: 3.0-alpha
Shell mode: all Default: off
If set, patterns which fail to match filenames during pathname expansion result in an error message.
force_fignore
Option: force_fignore Since: 3.0-alpha
Shell mode: interactive Default: on
If set, the suffixes specified by the FIGNORE shell variable cause words to be ignored when performing word completion even if the ignored words are the only possible completions. This option is enabled by default.
globasciiranges
Option: globasciiranges Since: 4.3-alpha
Shell mode: all Default: on (configurable at compile time)
If set, range expressions used in pattern matching behave as if in the traditional C locale when performing comparisons. That is, the current locale's collating sequence is not taken into account, so b will not collate between A and B, and upper-case and lower-case ASCII characters will collate together.
globstar
Option: globstar Since: 4.0-alpha
Shell mode: all Default: off
If set, recursive globbing with ** is enabled.
gnu_errfmt
Option: gnu_errfmt Since: 3.0-alpha
Shell mode: all Default: off
If set, shell error messages are written in the "standard GNU error message format".
histappend
Option: histappend Since: unknown
Shell mode: interactive (?) Default: off
If set, the history list is appended to the file named by the value of the HISTFILE variable when the shell exits, rather than overwriting the file.
histreedit
Option: histreedit Since: unknown
Shell mode: interactive (?) Default: off
If set, and readline is being used, a user is given the opportunity to re-edit a failed history substitution.
histverify
Option: histverify Since: unknown
Shell mode: interactive (?) Default: off
Allow to review a history substitution result by loading the resulting line into the editing buffer, rather than directly executing it.
hostcomplete
Option: hostcomplete Since: 2.0-alpha3
Shell mode: interactive (?) Default: on
If set, Bash completion also completes hostnames. On by default.
huponexit
Option: huponexit Since: 2.02-alpha1
Shell mode: interactive login Default: off
If set, Bash will send the SIGHUP signal to all jobs when an
interactive login shell exits.
interactive_comments
Option: interactive_comments Since: unknown
Shell mode: interactive Default: on
Allow commenting in interactive shells, on by default.
lastpipe
Option: lastpipe Since: 4.2-alpha
Shell mode: all Default: off
If set, and job control is not active, the shell runs the last command of a pipeline not executed in the background in the current shell environment.
lithist
Option: lithist Since: unknown
Shell mode: interactive Default: off
If set, and the #cmdhist option is enabled, multi-line commands are saved to the history with embedded newlines rather than using semicolon separators where possible.
localvar_inherit
Option: localvar_inherit Since: 5.0-alpha
Shell mode: all Default: off
If this option is set, a local variable inherits the value of a variable with the same name at the nearest preceding scope.
login_shell
Option: login_shell Since: 2.05a-alpha1
Shell mode: all Default: n/a
The option is set when Bash is a login shell. This is a readonly option.
mailwarn
Option: mailwarn Since: unknown
Shell mode: interactive (?) Default: off
If set, and a file that Bash is checking for mail has been accessed since the last time it was checked, the message "The mail in mailfile has been read" is displayed.
no_empty_cmd_completion
Option: mailwarn Since: unknown
Shell mode: interactive (?) Default: off
If set, and readline is being used, Bash will not attempt to search the PATH for possible completions when completion is attempted on an empty line.
nocaseglob
Option: nocaseglob Since: 2.02-alpha1
Shell mode: all Default: off
If set, Bash matches filenames in a case-insensitive fashion when performing pathname expansion.
nocasematch
Option: nocasematch Since: 3.1-alpha1
Shell mode: all Default: off
If set, Bash matches patterns in a case-insensitive fashion when
performing matching while executing case or [[ conditional commands.
nullglob
Option: nullglob Since: unknown
Shell mode: all Default: off
If set, Bash allows patterns which match no files to expand to a null string, rather than themselves.
progcomp
Option: progcomp Since: 2.04-alpha1
Shell mode: interactive (?) Default: on
If set, the programmable completion facilities are enabled. This option is enabled by default.
promptvars
Option: promptvars Since: unknown
Shell mode: interactive Default: on
If set, prompt strings undergo parameter expansion, command substitution, arithmetic expansion, and quote removal after being expanded using the prompt special sequences. This option is enabled by default.
restricted_shell
Option: restricted_shell Since: 2.03-alpha
Shell mode: interactive (?) Default: off
The option is set when Bash is a restricted shell. This is a readonly option.
shift_verbose
Option: shift_verbose Since: unknown
Shell mode: all Default: off, on in POSIX mode
If set, the shift builtin prints an error message when the shift count exceeds the number of positional parameters.
sourcepath
Option: sourcepath Since: unknown
Shell mode: all Default: on
If set, the source builtin command uses the value of PATH to find the directory containing the file supplied as an argument. This option is enabled by default.
syslog_history
Option: syslog_history Since: 5.0-alpha
Shell mode: unknown Default: off
If set, the shell history is sent to syslog.
This option is undocumented and available only if the shell supports syslog.
xpg_echo
Option: xpg_echo Since: 2.04-beta1
Shell mode: all Default: off
If set, the echo-builtin command expands backslash-escape sequences by
default (POSIX, SUS, XPG).
Parser configurations
Parser configurations change the way the Bash parser recognizes the syntax when parsing a line. This, of course, is impossible for a line that already was parsed.
There are two options that influence the parsing this way:
extglobextquote
Consequence: You can't use the new syntax (e.g. the extended globbing syntax) and the command to enable it in the same line.
$ shopt -s extglob; echo !(*.txt) # this is the WRONG way!
-bash: syntax error near unexpected token `('
You have to configure the parser before a line with new syntax is parsed:
$ shopt -s extglob # standalone - CORRECT way!
$ echo !(*.txt)
...
See also
- Internal: shopt builtin command
- Internal: set builtin command