If a symbolic mask is specified, the actual file permission bits, and not the inverse, should be specified. A symbolic mask is a comma separated list of rights. Each right consists of three parts:

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The first part specifies to whom this set of right applies, and can be one of u, g, o or a, where u specifies the user who owns the file, g specifies the group owner of the file, o specific other users rights and a specifies all three should be changed.

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The second part of a right specifies the mode, and can be one of =, + or -, where = specifies that the rights should be set to the new value, + specifies that the specified right should be added to those previously specified and - specifies that the specified rights should be removed from those previously specified.

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The third part of a right specifies what rights should be changed and can be any combination of r, w and x, representing read, write and execute rights.

If the first and second parts are skipped, they are assumed to be a and =, respectively. As an example, r,u+w means all users should have read access and the file owner should also have write access.

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-h or --help print this message

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-S or --symbolic prints the file-creation mask in symbolic form instead of octal form. Use man chmod for more information.

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-p or --as-command prints any output in a form that may be reused as input

The umask implementation in fish should behave identically to the one in bash.