unset(1)                                                       unset(1)

  unset

  NAME

    unset - remove variables/parameters

  SYNOPSIS

  C shell

    unset pattern

  Korn shell

    unset [-fv] parameter ...

  DESCRIPTION

    This command is a built-in command in the C shell and the Korn shell.

  C shell

    The unset(1) command removes all variables whose names match pattern,
    unless they are read-only. Thus, 'unset *' removes all variables unless
    they are read-only; this is not recommended. It is not an error if no
    variables are removed.

  Korn shell

    The unset(1) command unsets the named parameters (-v, the default) or
    functions (-f). The exit status is non-zero if any of the parameters were
    already unset; otherwise, it is zero.