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This command will open firefox in the private browser mode correctly

firefox -private &

However this command is only opening firefox in regular browser mode.

firefox -private&

What is the difference between these two commands?

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    They should behave identically. Did you close the first one, and wait for it to finish completely (so that it's not shown by ps -C firefox), before running the second? Commented Jun 27, 2016 at 12:24
  • @JigglyNaga I try this method , but it will not work Commented Jun 27, 2016 at 12:29
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    The interpretation of last space and & is done by the shell, so you should tell us what shell are you using. Commented Jun 27, 2016 at 12:42
  • @GiacomoCatenazzi iam using Bash shell Commented Jun 27, 2016 at 12:53
  • cross-posted here: askubuntu.com/questions/791918/… Commented Jun 27, 2016 at 14:36

1 Answer 1

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The space is actually irrelevant. The shell parses the command in exactly the same way.

The difference is whether Firefox is already running or not. It appears that the -private option only works when starting Firefox. If Firefox is already running, firefox -private opens a non-private window in the existing Firefox instance.

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