Diferença entre escrita 'function Name {…; } ',' Name () {…; } 'e' function Name () {…; } em bash [duplicado]

Question

Você pode escrever um bash de várias maneiras:

function JoinStrings {
    ...;
}

Ou

function JoinStrings () {
    ...;
}

Ou

JoinStrings () {
    ...;
}

Existe alguma diferença entre essas funções? Por que existem 3 maneiras diferentes de escrever uma função no bash? (Existem mais maneiras de escrever função?)

    

Answer 1

man bash diz:

Shell Function Definitions
   A  shell function is an object that is called like a simple command and exe‐
   cutes a compound command with a new set  of  positional  parameters.   Shell
   functions are declared as follows:

   name () compound-command [redirection]
   function name [()] compound-command [redirection]
          This  defines  a  function named name.  The reserved word function is
          optional.  If the function reserved word is supplied, the parentheses
          are  optional.  The body of the function is the compound command com‐
          pound-command (see Compound Commands above).  That command is usually
          a  list  of  commands  between { and }, but may be any command listed
          under Compound Commands above.  compound-command is executed whenever
          name  is  specified  as  the name of a simple command.  When in posix
          mode, name may not be the name of one of the POSIX special  builtins.
          Any redirections (see REDIRECTION below) specified when a function is
          defined are performed when the function is executed.  The exit status
          of  a  function  definition is zero unless a syntax error occurs or a
          readonly function with the same name already exists.  When  executed,
          the  exit status of a function is the exit status of the last command
          executed in the body.  (See FUNCTIONS below.)

Em suma, não há diferença.