unshare: what is shared by default? · util-linux/util-linux · Discussion #3839 · GitHub
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abitrolly
Nov 5, 2025

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Answered by karelzak Nov 7, 2025

It follows kernel syscall behavior:

man 2 unshare:

       If flags is specified as zero, then unshare() is a no-op; no changes are made to the calling
       process's execution context.

The result is that unshare(1) without any option just executes the shell.

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karelzak
Nov 7, 2025
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