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Namespace files describe how to construct a name space from scratch,
an operation normally performed by the newns or addns subroutines
(see auth(2)) which is typically called by init(8). Each line
specifies one name space operation. Spaces and tabs separate arguments
to operations. Blank lines and lines with # as
the first non–space character are ignored. Environment variables
of the form $name are expanded within arguments, where name is
a UTF string terminated by white space, a /, or a $.
The known operations and their arguments are:
mount [–abcC] servename old [spec]
bind [–abcC] new old
cd dir
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Change the working directory to dir.
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unmount [new] old
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Unmount new from old, or everything mounted on old if new is missing.
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chdev [–nr] devmask
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defines a string of driver characters to restrict the current
namespace to. Existing binds of drivers are left unaffected.
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clear
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Clear the name space with rfork(RFCNAMEG).
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. path
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Execute the namespace file path. Note that path must be present
in the name space being built.
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The options for bind and mount are interpreted as in bind(1).
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