(zsh.info)Specifying Options


Specifying Options
==================

Options are primarily referred to by name.  These names are case
insensitive and underscores are ignored.  For example, `allexport' is
equivalent to `A__lleXP_ort'.

The sense of an option name may be inverted by preceding it with `no',
so `setopt No_Beep' is equivalent to `unsetopt beep'.  This inversion
can only be done once, so `nonobeep' is _not_ a synonym for `beep'.
Similarly, `tify' is not a synonym for `nonotify' (the inversion of
`notify').

Some options also have one or more single letter names.  There are two
sets of single letter options: one used by default, and another used to
emulate `sh'/`ksh' (used when the SH_OPTION_LETTERS option is set).
The single letter options can be used on the shell command line, or
with the set, setopt and unsetopt builtins, as normal Unix options
preceded by `-'.

The sense of the single letter options may be inverted by using `+'
instead of `-'.  Some of the single letter option names refer to an
option being off, in which case the inversion of that name refers to
the option being on.  For example, `+n' is the short name of `exec', and
`-n' is the short name of its inversion, `noexec'.

In strings of single letter options supplied to the shell at startup,
trailing whitespace will be ignored; for example the string `-f    '
will be treated just as `-f', but the string `-f i' is an error.  This
is because many systems which implement the `#!' mechanism for calling
scripts do not strip trailing whitespace.


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