alias [ {+|-}gmrsL ] [ name[=value] ... ]
       For each name with a corresponding value, define an  alias  with
       that  value.   A trailing space in value causes the next word to
       be checked for alias expansion.  If  the  -g  flag  is  present,
       define  a global alias; global aliases are expanded even if they
       do not occur in command position.

       If the -s flag is present, define a suffix alias: if the command
       word on a command line is in the form `text.name', where text is
       any  non-empty  string,  it  is  replaced  by  the  text  `value
       text.name'.   Note that name is treated as a literal string, not
       a pattern.  A trailing space in value is  not  special  in  this
       case.  For example,

              alias -s ps=gv

       will  cause  the command `*.ps' to be expanded to `gv *.ps'.  As
       alias expansion is carried out earlier than globbing, the `*.ps'
       will  then  be  expanded.  Suffix aliases constitute a different
       name space from other aliases (so in the  above  example  it  is
       still  possible  to  create an alias for the command ps) and the
       two sets are never listed together.

       For each name with no value, print the value of  name,  if  any.
       With  no  arguments,  print  all currently defined aliases other
       than suffix aliases.  If the -m flag is given the arguments  are
       taken  as  patterns (they should be quoted to preserve them from
       being interpreted as glob patterns), and  the  aliases  matching
       these  patterns  are  printed.  When printing aliases and one of
       the -g, -r or -s flags is  present,  restrict  the  printing  to
       global, regular or suffix aliases, respectively; a regular alias
       is one which is neither a global nor a suffix alias.   Using `+'
       instead  of  `-',  or  ending the option list with a single `+',
       prevents the values of the aliases from being printed.

       If the -L flag is present, then print each  alias  in  a  manner
       suitable  for  putting  in a startup script.  The exit status is
       nonzero if a name (with no value) is given for  which  no  alias
       has been defined.

       For  more  on  aliases, include common problems, see the section
       ALIASING in zshmisc(1).
