I'm reinstalling everything in my current desktop computer (epi) (I use the alphabet to name them, like hurricanes, althought it has some more letter inside). I'm installing android SDK and I like it installed on /opt, so I downloaded it and unpacked using tar, mv, chown, ... then I got stuck when excution/search permits (x) was only for owners. Then using man chmod I found a way to do it the right way.
cd /opt sudo tar xvzf /home/franci/Downloads/android-sdk_r21.1-linux.tgz sudo chmod +r -R android-sdk-linux/ sudo chmod +X -R android-sdk-linux/
the new thing (I didn't know before reading chmod man page) is +X, it says to chmod to expand execution/search attribute if one of the three groups have it.
Now everyone can use it.
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