Shells

Tested shells and versions
Confirmation for bug
Built-in commands

Tested shells and versions

The shell included with the supported OS (the platform in bold) is the main supported shell.
Support for very old shells may be discontinued without notice.
The version with a dash does not work.
The version in italic may work, but some features are not working or unstable due to bugs in the shell.
Bourne shell (pre-POSIX shell) is not supported.

Packages

These are tested by GitHub Actions, Cirrus CI and Docker (contrib/test_in_docker.sh).

Alpine / BusyBox / OpenWrt (LEDE)

Default shell: busybox ash

Platform	bash	busybox	dash	loksh	mksh	oksh	yash	zsh
Alpine 3.15.4	5.1.16	1.34.1		7.0			-
Alpine edge				7.1		7.0	-
BusyBox 1.34.1	-	1.34.1	-	-	-		-	-
LEDE 17.01.7		1.25.1	-	-			-
OpenWrt 10.03.1		1.15.3		-			-	-
OpenWrt 12.09		1.19.4		-			-	-
OpenWrt 14.07		1.22.1		-			-
OpenWrt 15.05.1		1.23.2	-	-			-
OpenWrt 18.06.9		1.28.4	-	-			-
OpenWrt 19.07.9		1.30.1	-	-			-
OpenWrt 21.02.3		1.33.2	-	-			-

busybox 1.15.3, 1.19.4: readonly is not working properly.
busybox hush not supported.

AlmaLinux / Rocky Linux / CentOS / Fedora

Default shell: bash

Platform	bash	busybox	dash	yash	zsh
AlmaLinux 8.5	4.4.20	-	-	-
Rocky Linux 8.5	4.4.20	-	-	-
CentOS 7.9.2009	4.2.46	-	-	-
CentOS 8.4.2105	4.4.19	-	-	-	5.5.1
fedora 34	5.0.11
fedora 34	5.0.17

Testing bash 3.2.25- in POSIX mode only.

Debian / Ubuntu

Default shell: dash or bash (until debian 5.0)

Platform	bash	busybox	dash	ksh93	ksh2020	mksh	pdksh	posh	yash	zsh
Debian 2.2r7	2.03	-	-	-	-	-	5.2.14	-	-	3.1.9
Debian 3.0r6	2.05a	~~0.60.2~~	~~ash 0.3.8~~	-	-	-	5.2.14	-	-	4.0.4
Debian 3.1r8	2.05b	~~0.60.5~~	0.5.2	93q	-	-	5.2.14	0.3.14	-	4.2.5
Debian 4.0r9	3.1.17	1.1.3	0.5.3	93r	-	R28	5.2.14	0.5.4	-	4.3.2
Debian 5.0.10	3.2.39	1.10.2	0.5.4	93s+ 2008-01-31	-	R35	5.2.14	0.6.13	-	4.3.6
Debian 6.0.10	4.1.5	1.17.1	0.5.5.1	93s+ 2008-01-31	-	R39	5.2.14	0.8.5	-	4.3.10
Debian 7.11	4.2.37	1.20.0	0.5.7	93u+ 2012-02-29	-	R40	-	0.10.2	2.30	4.3.17
Debian 8.11	4.3.30	1.22.0	0.5.7	93u+ 2012-08-01	-	R50d	-	0.12.3	2.36	5.0.7
Debian 9.13	4.4.12	1.22.0	0.5.8	93u+ 2012-08-01	-	R54	-	0.12.6	2.43	5.3.1
Debian 10.12	5.0.3	1.30.1	0.5.10.2	93u+ 2012-08-01	-	R57	-	0.13.2	2.48	5.7.1
Debian 11.3	5.1.14	1.30.1	0.5.11	93u+ 2012-08-01	-	R59	-	0.14.1	2.50	5.8
Debian Bookworm	5.1.16			93u+m 1.0.0 beta.2	-		-		2.52	5.8.1
Ubuntu 12.04	4.2.25	1.18.5	0.5.7	93u 2011-02-08	-	R40	-	0.10	2.29	4.3.17
Ubuntu 14.04	4.3.11	1.21.0	0.5.7	93u+ 2012-08-01	-	R46	-	0.12.3	2.35	5.0.2
Ubuntu 16.04	4.3.48	1.22.0	0.5.8	93u+ 2012-08-01	-	R52c	-	0.12.6	2.39	5.1.1
Ubuntu 18.04	4.4.20	1.27.2	0.5.8	93u+ 2012-08-01	-	R56c	-	0.13.1	2.46	5.4.2
Ubuntu 20.04	5.0.16	1.30.1	0.5.10.2	93u+ 2012-08-01	2020.0.0	R58	-	0.13.2	2.49	5.8

Use debian/eol docker images for older Debian versions.
Testing bash 2.03-3.2.39 in both POSIX and non-POSIX mode. bash 4.1.5- is non-POSIX mode only.
pdksh 5.2.14 (Debian 2.2.r7): readonly is not working properly.
ksh 93q, 93r: Sometimes abort due to unstable bugs.
busybox 1.1.3: Builtin commands cannot be mocked.
busybox 1.10.2: It may not work properly due to a bug.
posh 0.8.5: Signal handling (trap) broken.
posh 0.10, 0.10.2: Shell flags (e.g. set -e, set -u) not working properly.
zsh 4.2.5: errexit handling broken.

FreeBSD

Default shell: ash

Platform	FreeBSD sh	bash	dash	ksh	mksh	oksh	pdksh	zsh
FreeBSD 11.4	unknown	5.1.8	0.5.11.4	93u+ 2012-08-01	R59c	6.9	5.2.14	5.8
FreeBSD 12.3	unknown	5.1.16	0.5.11.5	93u+ 2012-08-01	R59c	7.0	5.2.14	5.8.1
FreeBSD 13.0	unknown	5.1.16	0.5.11.5	93u+ 2012-08-01	R59c	7.0	5.2.14	5.8.1

pdksh 5.2.14: Unstable on CI environment (Bus Error, Bad address, Memory fault, core dumped and etc).

macOS

Default shell: bash

Platform	sh	bash	dash	ksh	mksh	posh	yash	zsh
macOS 10.10	bash 3.2.57	3.2.57	-	93u+ 2012-08-01	-	-	-	5.0.5
macOS 10.11	bash 3.2.57	3.2.57	-	93u+ 2012-08-01	-	-	-	5.0.8
macOS 10.12	bash 3.2.57	3.2.57	-	93u+ 2012-08-01	-	-	-	5.2
macOS 10.13	bash 3.2.57	3.2.57	-	93u+ 2012-08-01	-	-	-	5.3
macOS 10.14.4 (Mojave)	bash 3.2.57	3.2.57	-	93u+ 2012-08-01	-	-	-	5.3
macOS 10.15.5 (Catalina)	bash 3.2.57	3.2.57	-	93u+ 2012-08-01	-	-	-	5.7.1
macOS 11.6.2 (Big Sur)	bash 3.2.57	3.2.57	-	93u+ 2012-08-01	-	-	-	5.8
macOS 12.3.1 (Monterey)	bash 3.2.57	3.2.57	-	93u+ 2012-08-01	-	-	-	5.8
macOS 12.3.1 (brew)	-	5.1.0	0.5.11.2	2020.0.0	R59b	~~0.14.1~~	2.50	5.8

Supports the latest three versions.
Homebrew version of posh is broken.

Windows

Default shell: bash

Platform	bash	busybox	dash	mksh	posh	zsh
Windows Server 2019 (Git Bash)	4.4.23	-	unknown	-	-	-
Windows Server 2019 (msys)	5.1.16	1.31.1	0.5.11.5	R59	-	5.8
Windows Server 2019 (cygwin)	4.4.12	1.23.2	0.5.11.5	R56c	0.13.2	5.8
Windows Server 2019 (busybox-w32)	-	1.35.0 (4487)	-	-	-	-

busybox-w32: https://frippery.org/busybox/
- Versions that do not work properly
  - 4264, 4621

Manual test

This is not continuous test, it may break sometimes...

* Reported by user

Solaris

Platform	/bin/sh	/usr/bin/ksh	/usr/sunos/bin/ksh	/usr/sunos/bin/sh
Solaris 10	~~Bourne Shell~~	ksh88 M-11/16/88i	-	-
Solaris 11	ksh93 93u+ 2012-08-01	-	ksh88 M-11/16/88i	~~Bourne Shell~~

ksh88 M-11/16/88i: Builtin commands cannot be mocked.

OpenBSD / NetBSD

Platform	/bin/sh	/usr/bin/ksh
FreeBSD 13 current	FreeBSD sh	-
OpenBSD 6.6	OpenBSD ksh (POSIX mode pdksh) 5.2.14	pdksh 5.2.14
NetBSD 9.0	NetBSD sh 20181212 BUILD:20200214000628Z	pdksh 5.2.14

AIX

Platform	Shells
AIX 7.2.1.4 *	bash 4.3.30

Experimental

These are tested by Docker (contrib/test_in_docker.sh).

Schily Bourne Shell

Platform	Schily versions	bosh / pbosh
Debian bullseye	AN-2021-09-18	2021/07/23

Schily Bourne Shell (bosh, pbosh)
Packages are available on The NetBSD package collection.
Versions before 2018/10/07 not tested (probably not working).

GWSH shell

Platform	gwsh
Debian bullseye	snapshot-20190627

GWSH shell

Confirmation for bug

contrib/bugs.sh detects shell bugs and problems.

Usage: contrib/bugs.sh

Built-in commands

contrib/builtins.sh is a script for listing built-in commands.

Usage: contrib/builtins.sh

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