open(command::Cmd, mod::AbstractString="r", s
.. open(command, mode::AbstractString="r", stdio=DevNull)
Start running ``command`` asynchronously, and return a tuple
``(stream,process)``. If ``mode`` is ``"r"``, then ``stream``
reads from the process's standard output and ``stdio`` optionally
specifies the process's standard input stream. If ``mode`` is
``"w"``, then ``stream`` writes to the process's standard input
and ``stdio`` optionally specifies the process's standard output
stream.Examples
Read from a file
julia> fp = open("foo");
julia> print(readall(fp))
"bar"Append to a file
julia> fp = open("foo","a");
julia> str = "baz";
julia> write(fp, str);
julia> close(fp);
julia> readall("foo")
"barbaz"Repeat first line
julia> function f(file)
arr = readlines(file)
str = arr[1]
write(file, str)
end
f (generic function with 1 method)
julia> open(f, "numbers", "r+"); # file contains 1,2,3 in successive lines
julia> readall("numbers")
"1\n2\n3\n1\n"See Also
deserialize, eachline, eof, fd, flush, IOBuffer, ismarked, isopen, isreadonly, mark, nb_available, open, pipeline, position, read, read!, readavailable, readbytes, readbytes!, readline, redirect_stderr, redirect_stdin, reset, seek, seekend, seekstart, serialize, skip, skipchars, TextDisplay, unmark, write, writemime,User Contributed Notes
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