Man Eval en anglais
EVAL(P)                    POSIX Programmer's Manual                   EVAL(P)



 

NAME


       eval - construct command by concatenating arguments

 

SYNOPSIS


       eval [argument ...]

 

DESCRIPTION






       The  eval  utility shall construct a command by concatenating arguments
       together, separating each with a . The constructed command shall
       be read and executed by the shell.

 

OPTIONS


       None.

 

OPERANDS


       See the DESCRIPTION.

 

STDIN


       Not used.

 

INPUT FILES


       None.

 

ENVIRONMENT VARIABLES


       None.

 

ASYNCHRONOUS EVENTS


       Default.

 

STDOUT


       Not used.

 

STDERR


       The standard error shall be used only for diagnostic messages.

 

OUTPUT FILES


       None.

 

EXTENDED DESCRIPTION


       None.

 

EXIT STATUS


       If  there are no arguments, or only null arguments, eval shall return a
       zero exit status; otherwise, it shall return the  exit  status  of  the
       command  defined  by  the string of concatenated arguments separated by
       s.

 

CONSEQUENCES OF ERRORS


       Default.

       The following sections are informative.

 

APPLICATION USAGE


       None.

 

EXAMPLES


              foo=10 x=foo
              y='$'$x
              echo $y
              $fooeval y='$'$x
              echo $y
              10

 

RATIONALE


       None.

 

FUTURE DIRECTIONS


       None.

 

SEE ALSO


       Special Built-In Utilities

 

COPYRIGHT


       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
       Specifications  Issue  6,  Copyright  (C) 2001-2003 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open  Group.  In  the
       event of any discrepancy between this version and the original IEEE and
       The Open Group Standard, the original IEEE and The Open Group  Standard
       is  the  referee document. The original Standard can be obtained online
       at http://www.opengroup.org/unix/online.html .



IEEE/The Open Group                  2003                              EVAL(P)