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Thanks very much, It really works. I test and find something differences between these two commands. It seems echo yes | program can end the program immediately and correctly after it was run, whereas yes yes | program cannot. Could you please give me details on this issue?

Rilin Shen
– Rilin Shen

2017-08-24 18:21:55 +00:00
Commented Aug 24, 2017 at 18:21
1

The first will send one "yes"; the second sends as many as your program will read.

Jeff Schaller
– Jeff Schaller ♦

2017-08-24 19:01:09 +00:00
Commented Aug 24, 2017 at 19:01

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