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

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(P)