I thought it was the same as python, and I was addicted to the problem that the ruby interpreter did not start.

With python, the command python starts 2.x, and python3 starts the 3.x python interpreter. I think ruby is the same, I was running the ruby command with no arguments. Then, the line breaks to the next line, but the prompt is not displayed and the process does not end.

The cause was the wrong command. The interpreter for ruby was ʻirb. Use the ruby` command to evaluate a string as ruby in a script file or with the -e option.

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