如何获取ruby`print`来呼应bash脚本？

Question

I'm calling ruby from a bash shell script, like

#!/bin/bash

# lots of stuff

ruby script.rb

# more stuff

I'd like the things I print in the ruby script to show up in stdout for the shell script, but they don't. Strangely, whatever I use p on does show up. How can I get this to work for print ?

---

Quick answer: use puts .

Answer 1

My guess is this has to do with STDOUT buffering. p flushes the buffer immediately, while print does not. Use puts instead, which also flushes, or you can set STDOUT to always flush globally with:

$stdout.sync = true

To flush on a case-by-case basis, you can always call flush yourself:

print ...
print ...
print ...
$stdout.flush