From 2d91deba45d5a284614e06cc55e2be03599ca26d Mon Sep 17 00:00:00 2001 From: Matt Kraai Date: Wed, 1 Aug 2001 17:21:35 +0000 Subject: Allow multiple shells to be enabled. --- README | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) (limited to 'README') diff --git a/README b/README index ae0215c47..4f806a0bf 100644 --- a/README +++ b/README @@ -51,6 +51,38 @@ Supported kernels: ---------------- +Shells: + +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 Bourne shell grammer. It does handle pipes, redirects, and +job control though. Adding in command editing makes it very nice +lightweight command prompt. + +hush is also quite small (just 18k) and it has very complete Bourne shell +grammer. It handles if/then/else/fi just fine, but doesn't handle loops +like for/do/done or case/esac and such. It also currently has a problem +with job control. + +msh: 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 grammer (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. This was only recently added, so there is still +room to shrink it further... + +ash: This adds about 60k in the default configuration and is the most +complete and most pedantically correct shell included with busybox. This +shell was also recently added, and several people (mainly Vladimir and Erik) +have been working on it. There are a number of configurable things at the +top of ash.c as well, so check those out if you want to tweak things. The +Posix math support is currently disabled (that bit of code was horrible) but +will be restored for the next BusyBox release. + +---------------- + Getting help: When you find you need help, you can check out the BusyBox mailing list -- cgit v1.2.3