FG(1P)							     POSIX Programmer's Manual							    FG(1P)

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME

       fg - run jobs in the foreground

SYNOPSIS

       fg [job_id]

DESCRIPTION

       If job control is enabled (see the description of set -m), the fg utility shall move a background job from  the	current  environment  (see
       Shell Execution Environment ) into the foreground.

       Using  fg to place a job into the foreground shall remove its process ID from the list of those "known in the current shell execution envi-
       ronment''; see Asynchronous Lists .

OPTIONS

       None.

OPERANDS

       The following operand shall be supported:

       job_id Specify the job to be run as a foreground job. If no job_id operand is given, the job_id for the job that  was  most  recently  sus-
	      pended,  placed  in  the background, or run as a background job shall be used. The format of job_id is described in the Base Defini-
	      tions volume of IEEE Std 1003.1-2001, Section 3.203, Job Control Job ID.

STDIN

       Not used.

INPUT FILES

       None.

ENVIRONMENT VARIABLES

       The following environment variables shall affect the execution of fg:

       LANG   Provide a default value for the internationalization variables that  are	unset  or  null.  (See	the  Base  Definitions	volume	of
	      IEEE Std 1003.1-2001,  Section  8.2,  Internationalization  Variables  for  the precedence of internationalization variables used to
	      determine the values of locale categories.)

       LC_ALL If set to a non-empty string value, override the values of all the other internationalization variables.

       LC_CTYPE
	      Determine the locale for the interpretation of sequences of bytes of text data as characters (for example, single-byte as opposed to
	      multi-byte characters in arguments).

       LC_MESSAGES
	      Determine the locale that should be used to affect the format and contents of diagnostic messages written to standard error.

       NLSPATH
	      Determine the location of message catalogs for the processing of LC_MESSAGES .

ASYNCHRONOUS EVENTS

       Default.

STDOUT

       The fg utility shall write the command line of the job to standard output in the following format:

	      "%s
", <command>

STDERR

       The standard error shall be used only for diagnostic messages.

OUTPUT FILES

       None.

EXTENDED DESCRIPTION

       None.

EXIT STATUS

       The following exit values shall be returned:

	0     Successful completion.

       >0     An error occurred.

CONSEQUENCES OF ERRORS

       If job control is disabled, the fg utility shall exit with an error and no job shall be placed in the foreground.

       The following sections are informative.

APPLICATION USAGE

       The  fg	utility  does  not  work as expected when it is operating in its own utility execution environment because that environment has no
       applicable jobs to manipulate. See the APPLICATION USAGE section for bg . For this reason, fg is generally implemented as a  shell  regular
       built-in.

EXAMPLES

       None.

RATIONALE

       The  extensions to the shell specified in this volume of IEEE Std 1003.1-2001 have mostly been based on features provided by the KornShell.
       The job control features provided by bg, fg, and jobs are also based on the KornShell. The standard developers examined the characteristics
       of  the C shell versions of these utilities and found that differences exist. Despite widespread use of the C shell, the KornShell versions
       were selected for this volume of IEEE Std 1003.1-2001 to maintain a degree of uniformity with the rest of the KornShell	features  selected
       (such as the very popular command line editing features).

FUTURE DIRECTIONS

       None.

SEE ALSO

       Asynchronous Lists, Shell Execution Environment, bg, kill(), jobs, wait()

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- 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								    FG(1P)