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3

What's the function of wget's -O -?

rated 0 times [ 3] [ 0] / answers: 1 / hits: 9782 / 1 Year ago, sun, november 20, 2022, 7:46:07

I see some linux page says how to install the key:

  wget http://packages.ros.org/ros.key -O - | sudo apt-key add -

What is "-O -" in wget?

It seems related with "add -".

How these works?

Thank you~

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answered 1 Year ago egantfis · Accepted Answer

The option -O - prints the downloaded file to standard output (instead of a ordinary file) and the - option in apt-key reads from standard input. The command is equivalent to the two commands:

wget http://packages.ros.org/ros.key

sudo apt-key add ros.key

When you chain both commands you don't have to bother with saving a file and usually the command is shorter.