FEXBash - Revision history

Neobrain: FEXInterpreter -> FEX

2025-09-22T14:01:24Z

FEXInterpreter -> FEX

Sonicadvance1 at 00:22, 5 October 2023

2023-10-05T00:22:01Z

Sonicadvance1 at 00:44, 15 August 2022

2022-08-15T00:44:33Z

Sonicadvance1 at 00:44, 15 August 2022

2022-08-15T00:44:28Z

Sonicadvance1 at 00:21, 15 August 2022

2022-08-15T00:21:14Z

Sonicadvance1 at 00:18, 15 August 2022

2022-08-15T00:18:19Z

Sonicadvance1: Created page with "FEXBash is a utility program provided by FEX-emu for quickly spinning up a bash instance. == What isn't FEXBash == FEXBash is '''not''': * A virtual machine * A chroot * A way..."

2022-08-15T00:16:44Z

Created page with "FEXBash is a utility program provided by FEX-emu for quickly spinning up a bash instance. == What isn't FEXBash == FEXBash is '''not''': * A virtual machine * A chroot * A way..."

New page

FEXBash is a utility program provided by FEX-emu for quickly spinning up a bash instance.
== What isn't FEXBash ==
FEXBash is '''not''':
* A virtual machine
* A chroot
* A way to install packages inside the x86-64 rootfs

== What is FEXBash ==
FEXBash is a wrapper program that executes FEXInterpreter to run x86-64 '''/bin/sh''' or '''/bin/bash'''. Which application is executed depends on the number of arguments passed in

== Usage ==

=== Zero arguments ===
If the user passes in no arguments then FEXBash will execute x86-64 '''/bin/bash''' to give an emulated shell environment for tinkering around in.
ryanh@ubuntu:~$ uname -a
Linux ubuntu 5.15.0-rc1+ #106 SMP Tue Aug 2 19:43:23 PDT 2022 aarch64 aarch64 aarch64 GNU/Linux
ryanh@ubuntu:~$ FEXBash
FEXBash-ryanh@ubuntu:~> uname -a
Linux ubuntu 5.15.0 #FEX-2208-11-ga2f4f494a SMP Aug 13 2022 09:47:20 x86_64 x86_64 x86_64 GNU/Linux

This is not a virtual machine. It is just an emulated environment that overlays the AArch64 host environment. You can still execute AArch64 programs from the host and also x86-64 programs.

=== Any arguments ===
If any arguments are passed in then FEXBash executes '''/bin/sh -c''' with the provided arguments passed along. One must be careful with this as '''sh -c''' is usually expected to have its arguments wrapped in double quotes.
ryanh@ubuntu:~$ sh -c uname -a
Linux
ryanh@ubuntu:~$ sh -c "uname -a"
Linux ubuntu 5.15.0-rc1+ #106 SMP Tue Aug 2 19:43:23 PDT 2022 aarch64 aarch64 aarch64 GNU/Linux
ryanh@ubuntu:~$ FEXBash uname -a
Linux
ryanh@ubuntu:~$ FEXBash "uname -a"
Linux ubuntu 5.15.0 #FEX-2208-11-ga2f4f494a SMP Aug 13 2022 09:47:20 x86_64 x86_64 x86_64 GNU/Linux
As one can see, without the double quotes you effectively lose the '''-a''' argument. This behaves the same as '''/bin/sh -c''' behaviour without FEXBash.

This is usually used for some sort of scripting wanting to enter the FEX emulated environment.

← Older revision		Revision as of 00:44, 15 August 2022
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		+	[[Category:Utility_Type_Application]]
		+
	FEXBash is a utility program provided by FEX-emu for quickly spinning up a bash instance.		FEXBash is a utility program provided by FEX-emu for quickly spinning up a bash instance.
	== What isn't FEXBash ==		== What isn't FEXBash ==

@@ Line 12: / Line 12: @@
 == What is FEXBash ==
-FEXBash is a wrapper program that executes FEXInterpreter to run x86-64 '''/bin/sh''' or '''/bin/bash'''. Which application is executed depends on the number of arguments passed in
+FEXBash is a wrapper program that executes ''FEX'' to run x86-64 '''/bin/sh''' or '''/bin/bash'''. Which application is executed depends on the number of arguments passed in
 == Usage ==

@@ Line 9: / Line 9: @@
 * A way to install packages inside the x86-64 rootfs
 ** See [[Development:Setting_up_RootFS#If_you_want_to_install_packages_in_the_squashfs|this wiki page]] if you want to add packages to the rootfs.
 == What is FEXBash ==

@@ Line 1: / Line 1: @@
 [[Category:Utility_Type_Application]]
 FEXBash is a utility program provided by FEX-emu for quickly spinning up a bash instance.
 == What isn't FEXBash ==

@@ Line 3: / Line 3: @@
 FEXBash is '''not''':
 * A virtual machine
 * A chroot
 * A way to install packages inside the x86-64 rootfs
 ** See [[Development:Setting_up_RootFS#If_you_want_to_install_packages_in_the_squashfs|this wiki page]] if you want to add packages to the rootfs.