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Re: echo builtin doesn't handle end-of-options flag

From: Eli Schwartz
Subject: Re: echo builtin doesn't handle end-of-options flag
Date: Sun, 16 Aug 2020 12:20:57 -0400

On 8/16/20 11:47 AM, Todd A. Jacobs wrote:
> Configuration Information [Automatically generated, do not change]:
> Machine: x86_64
> OS: darwin19.5.0
> Compiler: clang
> Compilation CFLAGS: -DSSH_SOURCE_BASHRC -Wno-parentheses -Wno-format-security
> uname output: Darwin titan.local 19.6.0 Darwin Kernel Version 19.6.0: Thu Jun 
> 18 20:49:00 PDT 2020; root:xnu-6153.141.1~1/RELEASE_X86_64 x86_64
> Machine Type: x86_64-apple-darwin19.5.0
> Bash Version: 5.0
> Patch Level: 18
> Release Status: release
> Description:
>         The echo builtin accepts options, but does not seem to handle
>         `--` correctly as the end of options. The expected behavior
>         would be for -- to be removed, and any following flag-like
>         substrings printed as-is.


echo does not accept options, and is not permitted to accept options
including "--".

bash does accept -n, -e, -E in violation of POSIX, unless shopt -s shopt
-s xpg_echo is set, but it doesn't implement -- and I don't really see a
justification to do so. Either enable xpg_echo or use printf.

Eli Schwartz
Arch Linux Bug Wrangler and Trusted User

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