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bg(1)
NAME
  bg - Runs jobs in the background

SYNOPSIS
  bg [job_id...]

				     Note

       The C shell has a built-in version of the bg command.  If you are
       using the C shell, and want to guarantee that you are using the
       command described here, you must specify the full path /usr/bin/bg.
       See the csh(1) reference page for a description of the built-in
       command.

STANDARDS
  Interfaces documented on this reference page conform to industry standards
  as follows:

  bg:  XCU5.0

  Refer to the standards(5) reference page for more information about
  industry standards and associated tags.

OPTIONS
  None

OPERANDS
  job_id
      Specifies the job to be resumed as a background job. If no job_id
      operand is given, the most recently suspended job is used. The format
      of job_id is described in the Jobs section of the ksh(1) reference
      page.

DESCRIPTION
  If job control is enabled (see the description of set -m in the ksh(1)
  reference page), the bg utility resumes suspended jobs from the current
  environment by running them as background jobs.  If the job specified by
  job_id is a job already running in the background, the bg utility has no
  effect and will exit successfully.

  Using bg to place a job into the background causes its process ID to become
  "known in the current shell execution environment", as if it had been
  started as an asynchronous list.  See the Jobs section of the ksh(1)
  reference page.

RESTRICTIONS
   1.  If job control is disabled, the bg utility exits with an error and no
       job is placed in the background.

   2.  The bg utility does not work as expected when it is operating in its
       own utility execution environment because that environment has no
       suspended jobs.

EXIT STATUS
  The following exit values are returned:

  0   Successful completion.

  >0  An error occurred.

ENVIRONMENT VARIABLES
  The following environment variables affect the execution of bg:

  LANG
      Provides a default value for the internationalization variables that
      are unset or null. If LANG is unset or null, the corresponding value
      from the default locale is used.	If any of the internationalization
      variables contain an invalid setting, the utility behaves as if none of
      the variables had been defined.

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

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

  LC_MESSAGES
      Determines the locale used to affect the format and contents of
      diagnostic messages written to standard error.

  NLSPATH
      Determines the location of message catalogues for the processing of
      LC_MESSAGES.

SEE ALSO
  Commands:  csh(1), fg(1), jobs(1), kill(1), ksh(1), Bourne shell sh(1b),
  POSIX shell sh(1p), wait(1)

  Standards:  standards(5)

Index for Section 1

Alphabetical listing for B

Top of page