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(zsh.info)Expansion

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Expansion
*********

The following types of expansions are performed in the indicated order
in five steps:

_History Expansion_
     This is performed only in interactive shells.

_Alias Expansion_
     Aliases are expanded immediately before the command line is parsed
     as explained in Note: Aliasing.

_Process Substitution_
_Parameter Expansion_
_Command Substitution_
_Arithmetic Expansion_
_Brace Expansion_
     These five are performed in one step in left-to-right fashion.
     After these expansions, all unquoted occurrences of the characters
     `\', `'' and `"' are removed.

_Filename Expansion_
     If the SH_FILE_EXPANSION option is set, the order of expansion is
     modified for compatibility with `sh' and `ksh'.  In that case
     _filename expansion_ is performed immediately after _alias
     expansion_, preceding the set of five expansions mentioned above.

_Filename Generation_
     This expansion, commonly referred to as `globbing', is always done
     last.

The following sections explain the types of expansion in detail.

History Expansion

Process Substitution

Parameter Expansion

Command Substitution

Arithmetic Expansion

Brace Expansion

Filename Expansion

Filename Generation