Is there a function for printing the REPL content to a file in Julia language?

Question

I already have output some content in the REPL. Is there any function to print all this content to a file?

Answer 1

If those outputs have already been printed in the REPL, I guess the only way to save them to a file is copy-pasting manually. But if you would like to save the REPL output history for future use, one way is to overload display:

shell> touch repl_history.txt

julia> using REPL

julia> function REPL.display(d::REPL.REPLDisplay, mime::MIME"text/plain", x)
           io = REPL.outstream(d.repl)
           get(io, :color, false) && write(io, REPL.answer_color(d.repl))
           if isdefined(d.repl, :options) && isdefined(d.repl.options, :iocontext)
               # this can override the :limit property set initially
               io = foldl(IOContext, d.repl.options.iocontext,
                          init=IOContext(io, :limit => true, :module => Main))
           end
           show(io, mime, x)
           println(io)
           open("repl_history.txt", "a") do f
              show(f, mime, x)
              println(f)
           end
           nothing
       end

then, let's print something random in the REPL:

julia> rand(10)
10-element Array{Float64,1}:
 0.37537591915616497
 0.9478991508737484 
 0.32628512501942475
 0.8888960925262224 
 0.9967927432272801 
 0.4910769590205608 
 0.7624517049991089 
 0.26310423494973545
 0.5117608425961135 
 0.0762255311602309 

help?> gcd
search: gcd gcdx significand

  gcd(x,y)

  Greatest common (positive) divisor (or zero if x and y are both zero).

  Examples
  ≡≡≡≡≡≡≡≡≡≡

  julia> gcd(6,9)
  3

  julia> gcd(6,-9)
  3

And here is what the file content looks like:

shell> cat repl_history.txt
10-element Array{Float64,1}:
 0.37537591915616497
 0.9478991508737484 
 0.32628512501942475
 0.8888960925262224 
 0.9967927432272801 
 0.4910769590205608 
 0.7624517049991089 
 0.26310423494973545
 0.5117608425961135 
 0.0762255311602309 
  gcd(x,y)

  Greatest common (positive) divisor (or zero if x and y are both zero).

  Examples
  ≡≡≡≡≡≡≡≡≡≡

  julia> gcd(6,9)
  3

  julia> gcd(6,-9)
  3

If there is no need to work with REPL interactively, simply use julia script.jl > output.txt might also do the trick.