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Downloaded open JDK tar.gz file from https://jdk.java.net/15/. When I expand this file with command tar -xf openjdk-15.0.2_linux-x64_bin.tar.gz on one box permissions look like

drwxr-xr-x  2 me me 4.0K Feb 17 15:57 bin

On the other hand when same file, copied to other box and expanded with same command

drwxr-x---  2 me me 4.0K Feb 17 16:37 bin

Same applies to other files in bin directory - no one except myself who expanded the file has execute permissions. As a result I am not able to execute any of the java commands as a different user.

Both machines are Ubuntu 20.04. What could be causing the difference?

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  • Are you executing the command as root, or as a non-privileged user? what is the umask in each case? – steeldriver Feb 18 at 18:55
  • @steeldriver I am executing command as myself. I have sudo permissions on both boxes, but to expand the file, I did not use sudo. How do I check umask? – user871199 Feb 18 at 18:56
  • ... if you are using a bash shell, just type umask – steeldriver Feb 18 at 18:58
  • On machine where it works, umask in 0022, where it fails, it's 0027. – user871199 Feb 18 at 19:01
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As noted in man tar, when you extract an archive using tar as an unprivileged user, the default behavior is to apply the invoking user's umask to the extracted file permissions:

   --no-same-permissions
          Apply  the user's umask when extracting permissions from the ar‐
          chive (default for ordinary users).

In particular, a umask of 0027 removes all permissions for others, whereas 0022 removes only write permissions.

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