R Under development (unstable) (2023-11-16 r85542 ucrt) -- "Unsuffered Consequences"
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> message("*** Testing gcat()...")
*** Testing gcat()...
> 
> library("R.utils")
Loading required package: R.oo
Loading required package: R.methodsS3
R.methodsS3 v1.8.2 (2022-06-13 22:00:14 UTC) successfully loaded. See ?R.methodsS3 for help.
R.oo v1.25.0 (2022-06-12 02:20:02 UTC) successfully loaded. See ?R.oo for help.

Attaching package: 'R.oo'

The following object is masked from 'package:R.methodsS3':

    throw

The following objects are masked from 'package:methods':

    getClasses, getMethods

The following objects are masked from 'package:base':

    attach, detach, load, save

R.utils v2.12.3 successfully loaded. See ?R.utils for help.

Attaching package: 'R.utils'

The following object is masked from 'package:utils':

    timestamp

The following objects are masked from 'package:base':

    cat, commandArgs, getOption, isOpen, nullfile, parse, warnings

> 
> gcat("Hello world!\n")
Hello world!
> 
> a <- 1
> gcat("a=${a}\n")
a=1
> 
> gcat(GString("a=${a}\n"))
a=1
> 
> message("*** Testing gcat()...DONE")
*** Testing gcat()...DONE
> 
> 
> message("*** Testing gstring()...")
*** Testing gstring()...
> 
> a <- 2
> s <- gstring("a=${a}\n")
> print(s)
[1] "a=2\n"
> 
> cat("a=${a}\n", file="foo.txt")
> s <- gstring(file="foo.txt")
> print(s)
[1] "a=2"
> file.remove("foo.txt")
[1] TRUE
> 
> pathT <- tempdir()
> pathname <- file.path(pathT, "foo.txt")
> cat("a=${a}\n", file=pathname)
> s <- gstring(file="foo.txt", path=pathT)
> print(s)
[1] "a=2"
> file.remove(pathname)
[1] TRUE
> 
> message("*** Testing gcat()...DONE")
*** Testing gcat()...DONE
> 
> proc.time()
   user  system elapsed 
   0.34    0.15    0.43