Julia - Language - Writing and Reading files

Julia has an open function using which you can write to file and read from file. Here, we will first create a file named "myfile.txt" and then read from it. 

Step 1: Writing to a file:

$ julia
               _
   _       _ _(_)_     |  A fresh approach to technical computing
  (_)     | (_) (_)    |  Documentation: https://docs.julialang.org
   _ _   _| |_  __ _   |  Type "?help" for help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 0.6.0 (2017-06-19 13:05 UTC)
 _/ |\__'_|_|_|\__'_|  |  Official http://julialang.org/ release
|__/                   |  x86_64-pc-linux-gnu

julia> fopen = open("myfile.txt","w")
IOStream(<file write>)

julia> write(fopen,"Hello World! Welcome to Julia"*"\n")
30

julia> close(fopen)


Step 2: Reading from files:

julia> ### reading file now

julia> fopen = open("myfile.txt","r")
IOStream(<file write>)

julia> fread = readlines(fopen)
1-element Array{String,1}:
 "Hello World! Welcome to Julia"

julia> close(fopen)

julia> fopen = open("myfile.txt","r")
IOStream(<file write>)

julia> fread = readstring(fopen)
"Hello World! Welcome to Julia\n"

julia> close(fopen)

Step 3: Let us now check for the presence of the file. We execute OS commands from within Julia:

shell> ls -l
total 8
-rw-r--r-- 1 ubuntu ubuntu   30 Jun 25 20:30 myfile.txt

julia> 

We have seen now that, writing of file has been successful. Also, we are able to read from it. 

The following are the read and write modes available in Julia Language:

Mode	Description
r	read
r+	read, write
w	write, create, truncate
w+	read, write, create, truncate
a	write, create, append
a+	read, write, create, append