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- #elvdoc:var umask
- #
- # The file mode creation mask. Its value is a string in Elvish octal
- # representation; e.g. 0o027. This makes it possible to use it in any context
- # that expects a `$number`.
- #
- # When assigning a new value a string is implicitly treated as an
- # octal number. If that fails the usual rules for interpreting
- # [numbers](./language.html#number) are used. The following are equivalent:
- # `set unix:umask = 027` and `set unix:umask = 0o27`. You can also assign to it
- # a `float64` data type that has no fractional component. The assigned value
- # must be within the range [0 ... 0o777], otherwise the assignment will throw
- # an exception.
- #
- # You can do a temporary assignment to affect a single command; e.g. `umask=077
- # touch a_file`. After the command completes the old umask will be restored.
- # **Warning**: Since the umask applies to the entire process, not individual
- # threads, changing it temporarily in this manner is dangerous if you are doing
- # anything in parallel, such as via the [`peach`](builtin.html#peach) command.
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