Julia 1.0 Programming Cookbook

How to do it...

In this recipe, you will start a Julia process in the background and then pass commands to it via a named pipe:

1. First, create a named pipe using the mkfifo command. We will call it pipe:

$ mkfifo pipe

2. Check that a file named pipe was indeed created:

$ lspipe

3. Now, start Julia as a background process. Direct its standard input from pipe, and send standard output to log.txt and standard error to err.txt:

$ julia <pipe >log.txt 2>err.txt &

4. Before sending jobs to Julia, redirect the 3 descriptor to the named pipe:

$ exec 3>pipe

5. Now, you are ready to start sending commands to Julia. For this, you can use the echo command:

$ echo "1+2" >&3

6. Now, try sending a malformed expression:

$ echo "X" >&3

7. Finally, send exit()