👤
Home Man
Search
Today's Posts
Register

Linux & Unix Commands - Search Man Pages
Man Page or Keyword Search:
Select Section of Man Page:
Select Man Page Repository:

Linux 2.6 - man page for fg (linux section 1posix)

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 environment''; 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 suspended, placed in the background, or
	      run as a background job shall be used. The format of job_id  is  described  in  the
	      Base Definitions 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, Inter-
	      nationalization 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  interna-
	      tionalization 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  argu-
	      ments).

       LC_MESSAGES
	      Determine the locale that should be used to affect the format and contents of diag-
	      nostic 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\n", <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 APPLI-
       CATION USAGE section for bg . For this reason, fg is generally implemented as a shell reg-
       ular 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 charac-
       teristics 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 vol-
       ume of IEEE Std 1003.1-2001 to maintain a degree of uniformity with the rest of the  Korn-
       Shell 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 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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003					    FG(P)


All times are GMT -4. The time now is 12:47 PM.

Unix & Linux Forums Content Copyrightę1993-2018. All Rights Reserved.
×
UNIX.COM Login
Username:
Password:  
Show Password





Not a Forum Member?
Forgot Password?