[R-SIG-Mac] R 4.1.2 (arm build) will output for nothing when --interactive flag is passed

[Simon Urbanek]

Year,

that code doesn't output anything on stdout, because it is an error so it does show up on stderr:

$ echo "base::cat('Hello\\\\n')\\n" | R --silent --no-save --interactive 
> base::cat('Hello\\n')\n
Error: unexpected '\\' in "base::cat('Hello\\n')\"

What you probably meant was 

$ echo 'cat("Hello\n")' | R --silent --no-save --interactive 
> cat("Hello\n")
Hello
> 

which works as expected.

Cheers,
Simon




> On Jan 23, 2022, at 12:33 PM, YearNorth via R-SIG-Mac <r-sig-mac using r-project.org> wrote:
> 
> Dear developer:
> 
> On R 4.1.2 (arm build) in macOS 12.0.1, if call R from shell, when —interactive flag is passed, it will output nothing.
> 
> To reproduce it:
> 
> ```
> echo "base::cat('Hello\\\\n')\\n" | R --no-save --interactive > test.txt
> 
> ``
> 
> doesn’t yield the derised output
> 
> ```
> R version 4.1.2 (2021-11-01) -- "Bird Hippie”
> Copyright (C) 2021 The R Foundation for Statistical Computing
> Platform: aarch64-apple-darwin20 (64-bit)
> 
> R is free software and comes with ABSOLUTELY NO WARRANTY.
> You are welcome to redistribute it under certain conditions.
> Type 'license()' or 'licence()' for distribution details.
> 
>  Natural language support but running in an English locale
> 
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> Type 'contributors()' for more information and
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> Type 'q()' to quit R
> 
> ```
> 
> The desired output should have a line `> base::cat('Hello\\n')\n` in test.txt
> 
> This may be the critical problem for why `vscDebugger` (a R debugger for VSCode) does not work for arm build R.
> 
> See the discussion on github 
> https://github.com/ManuelHentschel/VSCode-R-Debugger/issues/155#issuecomment-1014946738 <https://github.com/ManuelHentschel/VSCode-R-Debugger/issues/155#issuecomment-1014946738>
> https://github.com/ManuelHentschel/VSCode-R-Debugger/issues/155#issuecomment-1017250405 <https://github.com/ManuelHentschel/VSCode-R-Debugger/issues/155#issuecomment-1017250405>
> 
> Thanks for your time reading and processing my email!
> 
> Best,
> North
> Year
> 	[[alternative HTML version deleted]]
> 
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