[gull] on topic : printf interne de bash

[felix]

On Tue, Mar 18, 2014 at 06:45:31PM +0100, dc wrote:
> On 18/03/2014 16:39, Felipe Gonzalez wrote:
> 
> >comment dans un script bash indiquer que l'on veut la commande interne
> >bash et pas l'executable externe ?
> 
> Bash execute en premier les fonctions internes à bash. la commande
> /usr/bin/printf ne sera donc pas exécutée à moins de le préciser.
Oui,

mais on avais vu:
   http://forum.linux-gull.ch/pipermail/gull/2012-November/013776.html

Pour s'assurer que l'on va bien executer la commande ``builtin'' et non une
fonction, on peut lancer:

   command cd

ou

   builtin cd

En fait la différence est subtile:

       builtin shell-builtin [arguments]
              Execute the specified shell builtin, passing it  arguments,  and
              return its exit status.  This is useful when defining a function
              whose name is the same as a shell builtin, retaining  the  func‐
              tionality of the builtin within the function.  The cd builtin is
              commonly redefined this way.  The  return  status  is  false  if
              shell-builtin is not a shell builtin command.

       command [-pVv] command [arg ...]
              Run command with args  suppressing  the  normal  shell  function
              lookup.  Only builtin commands or commands found in the PATH are
              executed.  If the -p option is given, the search for command  is
              performed  using  a default value for PATH that is guaranteed to
              find all of the standard utilities.  If  either  the  -V  or  -v
              option is supplied, a description of command is printed.  The -v
              option causes a single word indicating the command or file  name
              used to invoke command to be displayed; the -V option produces a
              more verbose description.  If the -V or -v option  is  supplied,
              the  exit  status  is  0 if command was found, and 1 if not.  If
              neither option is supplied and an error occurred or command can‐
              not  be found, the exit status is 127.  Otherwise, the exit sta‐
              tus of the command builtin is the exit status of command.


> C'est exactement la mème chose que pour 'test'.
> 
> dc
> 
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--
 Félix