select HUSH
bool "hush"
-config FEATURE_SH_IS_LASH
- select LASH
- bool "lash"
+####config FEATURE_SH_IS_LASH
+#### select LASH
+#### bool "lash"
config FEATURE_SH_IS_MSH
select MSH
config ASH
bool "ash"
default n
- select TEST
help
Tha 'ash' shell adds about 60k in the default configuration and is
the most complete and most pedantically correct shell included with
- busybox. This shell is actually a derivative of the Debian 'dash'
+ busybox. This shell is actually a derivative of the Debian 'dash'
shell (by Herbert Xu), which was created by porting the 'ash' shell
(written by Kenneth Almquist) from NetBSD.
comment "Ash Shell Options"
depends on ASH
+config ASH_BASH_COMPAT
+ bool "bash-compatible extensions"
+ default y
+ depends on ASH
+ help
+ Enable bash-compatible extensions.
+
config ASH_JOB_CONTROL
bool "Job control"
default y
'read -s' will read without echoing the user's input.
config ASH_READ_TIMEOUT
- bool "'read -t S' support."
+ bool "'read -t S' support"
default n
depends on ASH
help
help
Enable alias support in the ash shell.
-config ASH_MATH_SUPPORT
- bool "Posix math support"
- default y
- depends on ASH
- help
- Enable math support in the ash shell.
-
-config ASH_MATH_SUPPORT_64
- bool "Extend Posix math support to 64 bit"
- default n
- depends on ASH_MATH_SUPPORT
- help
- Enable 64-bit math support in the ash shell. This will make
- the shell slightly larger, but will allow computation with very
- large numbers.
-
config ASH_GETOPTS
bool "Builtin getopt to parse positional parameters"
default n
config ASH_BUILTIN_ECHO
bool "Builtin version of 'echo'"
default y
- select ECHO
depends on ASH
help
Enable support for echo, builtin to ash.
+config ASH_BUILTIN_PRINTF
+ bool "Builtin version of 'printf'"
+ default y
+ depends on ASH
+ help
+ Enable support for printf, builtin to ash.
+
config ASH_BUILTIN_TEST
bool "Builtin version of 'test'"
default y
- select TEST
depends on ASH
help
Enable support for test, builtin to ash.
Compile ash for reduced size at the price of speed.
config ASH_RANDOM_SUPPORT
- bool "Pseudorandom generator and variable $RANDOM"
+ bool "Pseudorandom generator and $RANDOM variable"
default n
depends on ASH
help
Enable pseudorandom generator and dynamic variable "$RANDOM".
Each read of "$RANDOM" will generate a new pseudorandom value.
You can reset the generator by using a specified start value.
- After "unset RANDOM" then generator will switch off and this
+ After "unset RANDOM" the generator will switch off and this
variable will no longer have special treatment.
config ASH_EXPAND_PRMT
default n
depends on ASH
help
- "PS#" may be contain volatile content, such as backquote commands.
+ "PS#" may contain volatile content, such as backquote commands.
This option recreates the prompt string from the environment
variable each time it is displayed.
config HUSH
bool "hush"
default n
- select TRUE
- select FALSE
- select TEST
help
- hush is a very small shell (just 18k) and it has fairly complete
- Bourne shell grammar. It even handles all the normal flow control
- options such as if/then/elif/else/fi, for/in/do/done, while loops,
- etc.
+ hush is a small shell (22k). It handles the normal flow control
+ constructs such as if/then/elif/else/fi, for/in/do/done, while loops,
+ case/esac. Redirections, here documents, $((arithmetic))
+ and functions are supported.
+
+ It will compile and work on no-mmu systems.
- It does not handle case/esac, select, function, here documents ( <<
- word ), arithmetic expansion, aliases, brace expansion, tilde
- expansion, &> and >& redirection of stdout+stderr, etc.
+ It does not handle select, aliases, brace expansion,
+ tilde expansion, &>file and >&file redirection of stdout+stderr.
+
+config HUSH_HELP
+ bool "help builtin"
+ default n
+ depends on HUSH
+ help
+ Enable help builtin in hush. Code size + ~1 kbyte.
config HUSH_INTERACTIVE
bool "Interactive mode"
prompting for next command (or executing next command in a script),
but no separate process group is formed.
+config HUSH_TICK
+ bool "Process substitution"
+ default n
+ depends on HUSH
+ help
+ Enable process substitution `command` and $(command) in hush.
-config LASH
- bool "lash"
+config HUSH_IF
+ bool "Support if/then/elif/else/fi"
default n
- select TRUE
- select FALSE
- select TEST
+ depends on HUSH
help
- lash is the very smallest shell (adds just 10k) and it is quite
- usable as a command prompt, but it is not suitable for any but the
- most trivial scripting (such as an initrd that calls insmod a few
- times) since it does not understand any Bourne shell grammar. It
- does handle pipes, redirects, and job control though. Adding in
- command editing makes it a very nice lightweight command prompt.
+ Enable if/then/elif/else/fi in hush.
+config HUSH_LOOPS
+ bool "Support for, while and until loops"
+ default n
+ depends on HUSH
+ help
+ Enable for, while and until loops in hush.
+
+config HUSH_CASE
+ bool "Support case ... esac statement"
+ default n
+ depends on HUSH
+ help
+ Enable case ... esac statement in hush. +400 bytes.
+
+config HUSH_FUNCTIONS
+ bool "Support funcname() { commands; } syntax"
+ default n
+ depends on HUSH
+ help
+ Enable support for shell functions in hush. +800 bytes.
+
+config HUSH_EXPORT_N
+ bool "Support export '-n' option"
+ default n
+ depends on HUSH
+ help
+ Enable support for export '-n' option in hush. It is a bash extension.
+
+config LASH
+ bool "lash (deprecated: aliased to hush)"
+ default n
+ select HUSH
+ help
+ lash is deprecated and will be removed, please migrate to hush.
config MSH
- bool "msh"
+ bool "msh (deprecated: please use hush)"
default n
- select TRUE
- select FALSE
- select TEST
help
- The minix shell (adds just 30k) is quite complete and handles things
- like for/do/done, case/esac and all the things you expect a Bourne
- shell to do. It is not always pedantically correct about Bourne
- shell grammar (try running the shell testscript "tests/sh.testcases"
- on it and compare vs bash) but for most things it works quite well.
- It also uses only vfork, so it can be used on uClinux systems.
+ msh is deprecated and will be removed, please migrate to hush.
+ If there is a feature msh has but hush does not, please let us know.
+
+# The minix shell (adds just 30k) is quite complete and handles things
+# like for/do/done, case/esac and all the things you expect a Bourne
+# shell to do. It is not always pedantically correct about Bourne
+# shell grammar (try running the shell testscript "tests/sh.testcases"
+# on it and compare vs bash) but for most things it works quite well.
+# It uses only vfork, so it can be used on uClinux systems.
+
comment "Bourne Shell Options"
depends on MSH || LASH || HUSH || ASH
+config SH_MATH_SUPPORT
+ bool "POSIX math support"
+ default y
+ depends on ASH || HUSH
+ help
+ Enable math support in the shell via $((...)) syntax.
+
+config SH_MATH_SUPPORT_64
+ bool "Extend POSIX math support to 64 bit"
+ default n
+ depends on SH_MATH_SUPPORT
+ help
+ Enable 64-bit math support in the shell. This will make the shell
+ slightly larger, but will allow computation with very large numbers.
+ This is not in POSIX, so do not rely on this in portable code.
+
config FEATURE_SH_EXTRA_QUIET
bool "Hide message on interactive shell startup"
default n
depends on (MSH || LASH || HUSH || ASH) && FEATURE_PREFER_APPLETS
help
This option causes busybox shells to use busybox applets
- in preference to executables in the PATH whenever possible. For
+ in preference to executables in the PATH whenever possible. For
example, entering the command 'ifconfig' into the shell would cause
- busybox to use the ifconfig busybox applet. Specifying the fully
+ busybox to use the ifconfig busybox applet. Specifying the fully
qualified executable name, such as '/sbin/ifconfig' will still
- execute the /sbin/ifconfig executable on the filesystem. This option
+ execute the /sbin/ifconfig executable on the filesystem. This option
is generally used when creating a statically linked version of busybox
for use as a rescue shell, in the event that you screw up your system.
started this way).
# untrue?
# Note that this will *also* cause applets to take precedence
-# over shell builtins of the same name. So turning this on will
+# over shell builtins of the same name. So turning this on will
# eliminate any performance gained by turning on the builtin "echo"
# and "test" commands in ash.
# untrue?
# Note that when using this option, the shell will attempt to directly
-# run '/bin/busybox'. If you do not have the busybox binary sitting in
+# run '/bin/busybox'. If you do not have the busybox binary sitting in
# that exact location with that exact name, this option will not work at
# all.
+config FEATURE_SH_NOFORK
+ bool "Run 'nofork' applets directly"
+ default n
+ depends on (MSH || LASH || HUSH || ASH) && FEATURE_PREFER_APPLETS
+ help
+ This option causes busybox shells [currently only ash]
+ to not execute typical fork/exec/wait sequence, but call <applet>_main
+ directly, if possible. (Sometimes it is not possible: for example,
+ this is not possible in pipes).
+
+ This will be done only for some applets (those which are marked
+ NOFORK in include/applets.h).
+
+ This may significantly speed up some shell scripts.
+
+ This feature is relatively new. Use with care.
+
config CTTYHACK
bool "cttyhack"
default n
projects / oweals / busybox.git / blobdiff