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Shells

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

Alpine / BusyBox / OpenWrt (LEDE)

Default shell: busybox ash

Platform bash busybox dash loksh mksh oksh yash zsh
Alpine 3.12.3 5.0.17 1.31.1 6.7.1 -
Alpine edge 6.8.1 6.8.1 -
BusyBox 1.32.0 - 1.32.0 - - - - -
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 19.07.5 1.30.1 - - -
  • busybox 1.15.3, 1.19.4: readonly is not working properly.
  • busybox hush not supported.

CentOS / Fedora

Default shell: bash

Platform bash busybox dash ksh mksh yash zsh
CentOS 7.9.2009 4.2.46 - - -
CentOS 8.3.2011 4.4.19 - - - 5.5.1
fedora 32 5.0.11
fedora 33 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 10.7 5.0.3 1.30.1 0.5.10.2 93u+ 2012-08-01 - R57 - 0.13.2 2.48 5.7.1
Debian bullseye 5.1.0 0.5.11 93u+ 2012-08-01 - R59c - 0.14.1 2.50 5.8
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 5.0.18 0.5.10.2 93u+ 2012-08-01 R59b 6.7 5.2.14 5.8
FreeBSD 12.2 unknown 5.0.18 0.5.10.2 93u+ 2012-08-01 R59b 6.7 5.2.14 5.8
  • 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 bash 3.2.57 3.2.57 - 93u+ 2012-08-01 - - - 5.3
macOS 10.15 bash 3.2.57 3.2.57 - 93u+ 2012-08-01 - - - 5.7.1
macOS 10.16 bash 3.2.57 3.2.57 - 93u+ 2012-08-01 - - - 5.8
macOS 10.15 (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) 4.4.23 1.31.1 0.5.11.2 R59 - 5.8
Windows Server 2019 (cygwin) 4.4.12 1.23.2 0.5.9.1 R56c 0.13.2 5.8
Windows Server 2019 (busybox-w32) - 1.33.0 (3578.0) - - - -

Self build

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

Schily Bourne Shell

Platform Schily versions bosh / pbosh
Debian buster AN-2018-10-30 2018/10/07
Debian buster AN-2019-03-11 2019/02/05
Debian buster AN-2019-09-22 2019/08/25
Debian buster AN-2019-10-07 2019/09/27
Debian buster AN-2019-10-25 - AN-2019-12-05 2019/10/25
Debian buster AN-2020-02-11 - AN-2020-03-11 2020/01/24
Debian buster AN-2020-03-27 2020/03/25
Debian buster AN-2020-04-18 2020/04/10
Debian buster AN-2020-05-11 - AN-2020-08-12 2020/04/27
Debian buster AN-2020-09-04 - AN-2020-09-22 2020/09/03
Debian buster AN-2020-11-04 - AN-2020-11-25 2020/11/04

GWSH shell

Platform gwsh
Debian buster snapshot-20190627

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

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