diff --git a/rootfs.sh b/rootfs.sh
index c60e6da..43bad6d 100755
--- a/rootfs.sh
+++ b/rootfs.sh
@@ -133,6 +133,9 @@ get_file https://ftp.gnu.org/gnu/make/make-3.80.tar.gz
 # bzip2 1.0.8
 get_file ftp://sourceware.org/pub/bzip2/bzip2-1.0.8.tar.gz
 
+# bash 2.05b
+get_file https://ftp.gnu.org/pub/gnu/bash/bash-2.05b.tar.gz
+
 # m4 1.4
 get_file https://ftp.gnu.org/gnu/m4/m4-1.4.tar.gz
 
diff --git a/sysa/after.kaem.run b/sysa/after.kaem.run
index ade0191..9c2ee43 100755
--- a/sysa/after.kaem.run
+++ b/sysa/after.kaem.run
@@ -97,9 +97,15 @@ cd bzip2-1.0.8
 kaem --file ../bzip2-1.0.8.kaem
 cd ..
 
-# Part 15: m4
+# Part 15: bash
+/after/bin/gunzip bash-2.05b.tar.gz
+/after/bin/tar xf bash-2.05b.tar
+cd bash-2.05b
+kaem --file ../bash-2.05b.kaem
+cd ..
+
+# Part 16: m4
 /after/bin/gunzip m4-1.4.tar.gz
 /after/bin/tar xf m4-1.4.tar
 cd m4-1.4
 kaem --file ../m4-1.4.kaem
-cd ..
diff --git a/sysa/bash-2.05b-builtins.mk b/sysa/bash-2.05b-builtins.mk
new file mode 100644
index 0000000..5e4146a
--- /dev/null
+++ b/sysa/bash-2.05b-builtins.mk
@@ -0,0 +1,23 @@
+.SUFFIXES = .def
+
+include ../common.mk
+
+CFLAGS  = \
+	-I. \
+	-I.. \
+	-I../include \
+	-I../lib \
+	$(COMMON_CFLAGS)
+
+BUILTINS_DEFS = $(addsuffix .def, $(BUILTINS_DEF_FILES))
+BUILTINS_DEF_OBJS = $(addsuffix .o, $(BUILTINS_DEF_FILES))
+BUILTINS_STATIC_FILES = common evalstring evalfile getopt bashgetopt
+BUILTINS_STATIC_OBJS = $(addsuffix .o, $(BUILTINS_STATIC_FILES))
+BUILTINS_OBJS = $(BUILTINS_DEF_OBJS) $(BUILTINS_STATIC_OBJS)
+
+%.o: %.def
+	../mkbuiltins $<
+	$(CC) -c $(CFLAGS) -o $@ $*.c
+
+libbuiltins.a: $(BUILTINS_OBJS) builtins.o
+	$(AR) cr $@ $(BUILTINS_OBJS) builtins.o
diff --git a/sysa/bash-2.05b-common.mk b/sysa/bash-2.05b-common.mk
new file mode 100644
index 0000000..3cca351
--- /dev/null
+++ b/sysa/bash-2.05b-common.mk
@@ -0,0 +1,53 @@
+CC      = tcc
+LD      = tcc
+AR      = tcc -ar
+
+COMMON_CFLAGS  = \
+	-DHAVE_DIRENT_H \
+	-DSTRUCT_DIRENT_HAS_D_INO \
+	-DHAVE_STDINT_H \
+	-DHAVE_LIMITS_H \
+	-DHAVE_STRING_H \
+	-DHAVE_INTTYPES_H \
+	-DRETSIGTYPE=void \
+	-DHUGE_VAL=10000000000.0 \
+	-DTERMIO_TTY_DRIVER \
+	-DPREFER_STDARG \
+	-DHAVE_DECL_STRTOL \
+	-DHAVE_DECL_STRTOLL \
+	-DHAVE_DECL_STRTOUL \
+	-DHAVE_DECL_STRTOULL \
+	-DHAVE_TZNAME \
+	-DPIPESIZE=4096 \
+	-DDEFAULT_PATH_VALUE=\"/after/bin\" \
+	-DSTANDARD_UTILS_PATH=\"/after/bin\" \
+	-DPPROMPT=\"$ \" \
+	-DSPROMPT=\"$ \" \
+	-DCONF_MACHTYPE=\"bootstrap\" \
+	-DGETGROUPS_T=int \
+	-DCOND_COMMAND \
+	-DCONF_HOSTTYPE=\"i386\" \
+	-DCONF_OSTYPE=\"linux\" \
+	-DDEFAULT_MAIL_DIRECTORY=\"/fake-mail\" \
+	-DVOID_SIGHANDLER \
+	-DDISTVERSION=\"2.05b\" \
+	-DBUILDVERSION=\"0\" \
+	-DSCCSVERSION=\"2.05b\" \
+	-DLC_ALL=\"C\" \
+	-DHAVE_STRERROR \
+	-DHAVE_MEMSET \
+	-DHAVE_DUP2 \
+	-DHAVE_STRTOUL \
+	-DHAVE_STRTOULL \
+	-DHAVE_STRCHR \
+	-DHAVE_BCOPY \
+	-DHAVE_BZERO \
+	-DHAVE_POSIX_SIGNALS \
+	-DHAVE_GETCWD \
+	-Dendpwent\(x\)=0 \
+	-Denable_hostname_completion\(on_or_off\)=0
+
+BUILTINS_DEF_FILES = alias bind break builtin cd colon command complete declare \
+	echo enable eval exec exit fc fg_bg hash history jobs kill let read return \
+	set setattr shift source suspend test times trap type ulimit umask wait \
+	getopts pushd shopt printf
diff --git a/sysa/bash-2.05b.kaem b/sysa/bash-2.05b.kaem
new file mode 100755
index 0000000..2daf28c
--- /dev/null
+++ b/sysa/bash-2.05b.kaem
@@ -0,0 +1,31 @@
+#!/bin/sh
+
+set -ex
+
+# Variables
+bindir=/after/bin
+
+catm config.h
+catm include/version.h
+catm include/pipesize.h
+
+# Patch
+patch -Np0 -i ../patches/bash-2.05b/mes-libc.patch
+patch -Np0 -i ../patches/bash-2.05b/tinycc.patch
+patch -Np0 -i ../patches/bash-2.05b/missing-defines.patch
+patch -Np0 -i ../patches/bash-2.05b/locale.patch
+patch -Np0 -i ../patches/bash-2.05b/dev-tty.patch
+
+# Compile
+cp ../bash-2.05b.mk Makefile
+cp ../bash-2.05b-builtins.mk builtins/Makefile
+cp ../bash-2.05b-common.mk common.mk
+make mkbuiltins
+cd builtins
+make libbuiltins.a
+cd ..
+make
+
+# Install
+cp bash /after/bin/
+chmod 755 /after/bin/bash
diff --git a/sysa/bash-2.05b.mk b/sysa/bash-2.05b.mk
new file mode 100644
index 0000000..87eb5df
--- /dev/null
+++ b/sysa/bash-2.05b.mk
@@ -0,0 +1,84 @@
+include common.mk
+
+CFLAGS  = \
+		  -I. \
+		  -Iinclude \
+		  -Ilib \
+		  -Ilib/sh \
+		  -Ibuiltins \
+		  $(COMMON_CFLAGS)
+
+LDFLAGS   = -L. -Lbuiltins
+LIBRARIES = libsh.a builtins/libbuiltins.a libglob.a libtilde.a
+
+SHLIB_FILES = clktck getcwd getenv oslib setlinebuf strcasecmp strerror strtod \
+	vprint itos rename zread zwrite shtty inet_aton netopen \
+	strpbrk timeval clock makepath pathcanon pathphys stringlist stringvec \
+	tmpfile spell strtrans strindex shquote snprintf mailstat fmtulong \
+	fmtullong strtoll strtoull strtoimax strtoumax fmtumax netconn mktime \
+	strftime xstrchr zcatfd
+# FIXME: for some reason these don't get picked up correctly in the
+# final linking cmd
+SHLIB_ODD_FILES = zcatfd strtoumax spell pathphys
+SHLIB_OBJS = $(addprefix lib/sh/, $(addsuffix .o, $(SHLIB_FILES)))
+SHLIB_ODD_OBJS = $(addprefix lib/sh/, $(addsuffix .o, $(SHLIB_ODD_FILES)))
+
+MKBUILTINS_OBJS = builtins/mkbuiltins.o
+BUILTINS_DEFS = $(addprefix builtins/, $(addsuffix .def, $(BUILTINS_DEF_FILES)))
+
+GLOB_FILES = glob strmatch smatch xmbsrtowcs
+GLOB_OBJS = $(addprefix lib/glob/, $(addsuffix .o, $(GLOB_FILES)))
+
+TILDE_OBJS = lib/tilde/tilde.o
+
+MKSYNTAX_OBJS = mksyntax.o
+MKSIGNAMES_OBJS = support/mksignames.o
+
+FILES = shell eval y.tab general make_cmd print_cmd dispose_cmd execute_cmd \
+	variables copy_cmd error expr flags nojobs subst hashcmd hashlib mailcheck \
+	trap input unwind_prot pathexp sig test version alias array arrayfunc \
+	braces bracecomp bashhist bashline list stringlib locale findcmd redir \
+	pcomplete pcomplib syntax xmalloc siglist
+OBJS = $(addsuffix .o, $(FILES))
+
+all: bash
+
+# Builtins
+
+mkbuiltins: $(MKBUILTINS_OBJS)
+	$(CC) $(CFLAGS) $(MKBUILTINS_OBJS) $(LDFLAGS) -o $@
+	./mkbuiltins -externfile builtins/builtext.h -structfile builtins/builtins.c -noproduction $(BUILTINS_DEFS)
+
+# libsh
+
+libsh.a: $(SHLIB_OBJS)
+	$(AR) cr $@ $(SHLIB_OBJS)
+
+# libglob
+
+libglob.a: $(GLOB_OBJS)
+	$(AR) cr $@ $(GLOB_OBJS)
+
+# libtilde
+
+libtilde.a: $(TILDE_OBJS)
+	$(AR) cr $@ $(TILDE_OBJS)
+
+# The actual program
+
+mksyntax: $(MKSYNTAX_OBJS)
+	$(CC) $(MKSYNTAX_OBJS) $(LDFLAGS) -o $@ -lgetopt
+
+syntax.c: mksyntax
+	./mksyntax -o $@
+
+mksignames: $(MKSIGNAMES_OBJS)
+	$(CC) $(MKSIGNAMES_OBJS) $(LDFLAGS) -o $@ -lgetopt
+
+signames.h: mksignames
+	./mksignames $@
+
+trap.c: signames.h
+
+bash: libsh.a libglob.a libtilde.a $(OBJS)
+	$(CC) -o bash $(LIBRARIES) $(OBJS) $(SHLIB_ODD_OBJS) $(LDFLAGS) -lsh -lbuiltins -lglob -ltilde
diff --git a/sysa/patches/bash-2.05b/dev-tty.patch b/sysa/patches/bash-2.05b/dev-tty.patch
new file mode 100644
index 0000000..3f59a65
--- /dev/null
+++ b/sysa/patches/bash-2.05b/dev-tty.patch
@@ -0,0 +1,11 @@
+diff --color -ru shell.c
+--- shell.c	2002-07-02 01:27:11.000000000 +1000
++++ shell.c	2021-01-16 11:23:36.407287955 +1100
+@@ -342,8 +342,6 @@
+ #  endif
+ #endif
+ 
+-  check_dev_tty ();
+-
+ #ifdef __CYGWIN__
+   _cygwin32_check_tmp ();
diff --git a/sysa/patches/bash-2.05b/extern.patch b/sysa/patches/bash-2.05b/extern.patch
new file mode 100644
index 0000000..c424c29
--- /dev/null
+++ b/sysa/patches/bash-2.05b/extern.patch
@@ -0,0 +1,12 @@
+--- builtins/common.c.bak	2021-01-15 21:32:56.938683418 +1100
++++ builtins/common.c	2021-01-15 21:34:09.102153806 +1100
+@@ -46,6 +46,9 @@
+ #include "../flags.h"
+ #include "../jobs.h"
+ #include "../builtins.h"
++int num_shell_builtins;
++struct builtin *shell_builtins;
++struct builtin *current_builtin;
+ #include "../input.h"
+ #include "../execute_cmd.h"
+ #include "../trap.h"
diff --git a/sysa/patches/bash-2.05b/locale.patch b/sysa/patches/bash-2.05b/locale.patch
new file mode 100644
index 0000000..6529fe3
--- /dev/null
+++ b/sysa/patches/bash-2.05b/locale.patch
@@ -0,0 +1,11 @@
+--- locale.c	2021-01-15 09:38:55.729307629 +1100
++++ locale.c	2021-01-15 11:19:01.929391346 +1100
+@@ -190,7 +190,7 @@
+ set_lang (var, value)
+      char *var, *value;
+ {
+-  return ((lc_all == 0 || *lc_all == 0) ? setlocale (LC_ALL, value?value:"") != NULL : 0);
++  return 0;
+ }
+ 
+ /* Get the value of one of the locale variables (LC_MESSAGES, LC_CTYPE) */
diff --git a/sysa/patches/bash-2.05b/mes-libc.patch b/sysa/patches/bash-2.05b/mes-libc.patch
new file mode 100644
index 0000000..49eb5b0
--- /dev/null
+++ b/sysa/patches/bash-2.05b/mes-libc.patch
@@ -0,0 +1,13 @@
+diff --git lib/sh/snprintf.c lib/sh/snprintf.c
+index 7669576..747aeba 100644
+--- lib/sh/snprintf.c
++++ lib/sh/snprintf.c
+@@ -376,7 +376,7 @@ static void xfree __P((void *));
+ 	    if ((p)->flags & PF_STAR_P) \
+ 	      (p)->precision = GETARG (int)
+ 
+-#if defined (HAVE_LOCALE_H)
++#if 0
+ #  define GETLOCALEDATA(d, t, g) \
+       do \
+ 	{ \
diff --git a/sysa/patches/bash-2.05b/missing-defines.patch b/sysa/patches/bash-2.05b/missing-defines.patch
new file mode 100644
index 0000000..8227b7c
--- /dev/null
+++ b/sysa/patches/bash-2.05b/missing-defines.patch
@@ -0,0 +1,21 @@
+--- ../bash-2.05b.bak/execute_cmd.c	2021-01-15 09:38:55.730307635 +1100
++++ execute_cmd.c	2021-01-15 09:43:41.046896754 +1100
+@@ -286,12 +286,18 @@
+     {
+       if (currently_executing_command->type == cm_simple)
+ 	return currently_executing_command->value.Simple->line;
++#ifdef COND_COMMAND
+       else if (currently_executing_command->type == cm_cond)
+ 	return currently_executing_command->value.Cond->line;
++#endif
++#ifdef DPAREN_ARITHMETIC
+       else if (currently_executing_command->type == cm_arith)
+ 	return currently_executing_command->value.Arith->line;
++#endif
++#ifdef ARITH_FOR_COMMAND
+       else if (currently_executing_command->type == cm_arith_for)
+ 	return currently_executing_command->value.ArithFor->line;
++#endif
+       else
+ 	return line_number;
+     }
diff --git a/sysa/patches/bash-2.05b/tinycc.patch b/sysa/patches/bash-2.05b/tinycc.patch
new file mode 100644
index 0000000..9fa0864
--- /dev/null
+++ b/sysa/patches/bash-2.05b/tinycc.patch
@@ -0,0 +1,23 @@
+diff --git lib/sh/oslib.c lib/sh/oslib.c
+index 90d7be9..37fdf2a 100644
+--- lib/sh/oslib.c
++++ lib/sh/oslib.c
+@@ -192,8 +192,7 @@ bzero (s, n)
+ #    include <sys/utsname.h>
+ int
+ gethostname (name, namelen)
+-     char *name;
+-     int namelen;
++     char *name; int namelen;
+ {
+   int i;
+   struct utsname ut;
+@@ -209,7 +208,7 @@ gethostname (name, namelen)
+ #  else /* !HAVE_UNAME */
+ int
+ gethostname (name, namelen)
+-     int name, namelen;
++     char* name; int namelen;
+ {
+   strncpy (name, "unknown", namelen);
+   name[namelen] = '\0';