R : Copyright 2001, The R Development Core Team
Version 1.3.0 Patched (2001-08-06)

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> ## NB: this file must be a DOS (CRLF) format file
> 
> ## simple tests that multiple lines are read correctly
> print(2+3)
[1] 5
> print(4+5)
[1] 9
> 
> ## generate some files to source
> 
> z <- c("#line 1", "2+3", "ls()", "pi", "# last line")
> 
> ## ========  LF file
> cat(z, file="testIO.R", sep="\n")
> readLines("testIO.R")
[1] "#line 1"     "2+3"         "ls()"        "pi"          "# last line"
> source("testIO.R", echo=TRUE)

> 2 + 3
[1] 5

> ls()
[1] "z"

> pi
[1] 3.141593
> unlink("testIO.R")
> 
> ## ======== LF file, incomplete final line
> zz <- file("testIO.R", "wt")
> cat(z, file=zz, sep="\n")
> cat("5+6", file=zz)
> close(zz)
> readLines("testIO.R")
[1] "#line 1"     "2+3"         "ls()"        "pi"          "# last line"
[6] "5+6"        
Warning message: 
incomplete final line found by readLines on `testIO.R' 
> source("testIO.R", echo=TRUE)

> 2 + 3
[1] 5

> ls()
[1] "last.warning" "z"            "zz"          

> pi
[1] 3.141593

> 5 + 6
[1] 11
> unlink("testIO.R")
> 
> ## ======== CRLF file
> cat(z, file="testIO.R", sep="\r\n")
> source("testIO.R", echo=TRUE)

> 2 + 3
[1] 5

> ls()
[1] "last.warning" "z"            "zz"          

> pi
[1] 3.141593
> readLines("testIO.R")
[1] "#line 1"     "2+3"         "ls()"        "pi"          "# last line"
> unlink("testIO.R")
> 
> ## ======== CRLF file, incomplete final line
> zz <- file("testIO.R", "wt")
> cat(z, file=zz, sep="\r\n")
> cat("5+6", file=zz)
> close(zz)
> readLines("testIO.R")
[1] "#line 1"     "2+3"         "ls()"        "pi"          "# last line"
[6] "5+6"        
Warning message: 
incomplete final line found by readLines on `testIO.R' 
> source("testIO.R", echo=TRUE)

> 2 + 3
[1] 5

> ls()
[1] "last.warning" "z"            "zz"          

> pi
[1] 3.141593

> 5 + 6
[1] 11
> unlink("testIO.R")
> 
> ## ======== CR file
> cat(z, file="testIO.R", sep="\r")
> readLines("testIO.R")
[1] "#line 1"     "2+3"         "ls()"        "pi"          "# last line"
Warning message: 
incomplete final line found by readLines on `testIO.R' 
> source("testIO.R", echo=TRUE)

> 2 + 3
[1] 5

> ls()
[1] "last.warning" "z"            "zz"          

> pi
[1] 3.141593
> unlink("testIO.R")
> 
> ## ======== CR file, incomplete final line
> zz <- file("testIO.R", "wt")
> cat(z, file=zz, sep="\r")
> cat("\r5+6", file=zz)
> close(zz)
> readLines("testIO.R")
[1] "#line 1"     "2+3"         "ls()"        "pi"          "# last line"
[6] "5+6"        
Warning message: 
incomplete final line found by readLines on `testIO.R' 
> source("testIO.R", echo=TRUE)

> 2 + 3
[1] 5

> ls()
[1] "last.warning" "z"            "zz"          

> pi
[1] 3.141593

> 5 + 6
[1] 11
> unlink("testIO.R")
> 
> ## end of reg-IO.R: the next line has no EOL chars
> 2 + 2
[1] 4
>