I tried to write the output of the command php -i to the a file using php -i > info and received the following error:

output is not a tty

What does it mean?

I'm using git bash on Windows.


I found an similar topic like this. One Solution which worked for me:


php.exe -i > info

instead of

php -i > info

So yust append the .exe extension to your commands and it works.

Found this solution here: https://stackoverflow.com/a/44727575/2377961

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  • Thanks, I've been trying to figure out for a while now why this appeared to sometimes work and sometimes not, and that was the difference! – Chris Haas Feb 26 at 18:50

What worked for me, based on Peh's comments to stackoverflow.com/questions/33622087

If you use C:\Program Files\Git\bin\bash.exe instead of C:\Program Files\Git\git-bash.exe then the command works fine

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  • 3
    This didn't work for me. I get the same error. – Ryan Jan 20 '17 at 15:07
  • 1
    But it worked for me today! I don't know why it didn't work a few months ago. +1 – Ryan Apr 3 '17 at 23:37
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    just type bash inside git bash – Rivenfall Jul 5 '19 at 12:06

If you happen to be using winpty under the hood, you have to pass the -Xallow-non-tty argument to fix this:

$ winpty python -c 'print("hello")' | grep h
stdout is not a tty

$ winpty -Xallow-non-tty python -c 'print("hello")' | grep h

However, if the output is mangled, the -Xplain argument will also be required:

$ winpty -Xallow-non-tty python -c 'print("hello")' | xxd
00000000: 1b5b 306d 1b5b 304b 6865 6c6c 6f1b 5b30  .[0m.[0Khello.[0
00000010: 4b1b 5b3f 3235 6c0d 0a1b 5b30 4b1b 5b3f  K.[?25l...[0K.[?
00000020: 3235 68                                  25h

$ winpty -Xallow-non-tty -Xplain python -c 'print("hello")' | xxd
00000000: 6865 6c6c 6f0d 0a                        hello..
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  • 1
    Solved the issue for me when using node through conemu. – jakub.g Sep 19 '18 at 15:32
  • Thank you so much...This worked for me. – HassanSh__3571619 Oct 29 '19 at 23:03
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    This one should be accepted as the correct solution – workplaylifecycle Feb 20 at 2:32

I believe this issue is more about how Git Bash handles piping, and less about PHP, because I encountered the same symptom using Python on Windows. The currently most-voted answer does not work for me. It might work a few months later, based on this comment and a follow-up comment. But I'm impatient so I choose to use the native Windows Command Prompt and, voila, it works!

DOESN'T WORK in Git Bash

rayluo@DESKTOP-10B0N4G MINGW64 ~
$ python -c "print('hello world')" > test.txt
stdout is not a tty

WORKS in Command Prompt

(env27) C:\Users\rayluo>python -c "print('hello world')" > test.txt
(env27) C:\Users\rayluo>type test.txt
hello world
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You are redirecting you output from your terminal (tty) to a file. Therefore your output is no longer a tty.

The message makes perfect sense. However this should not be an error.

I cannot reproduce this behavior on a linux system.

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  • Sorry, i did comment on the wrong place. please run "strace php -i" and paste the output (last few lines at first). – gerhard d. Dec 10 '15 at 10:11

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