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

       batch - schedule commands to be executed in a batch queue


       The  batch utility shall read commands from standard input and schedule them for execution
       in a batch queue. It shall be the equivalent of the command:

	      at -q b -m now

       where queue b is a special at queue, specifically for batch jobs. Batch jobs shall be sub-
       mitted  to  the	batch queue with no time constraints and shall be run by the system using
       algorithms, based on unspecified factors, that may vary with each invocation of batch.

       Users  shall  be  permitted  to	use  batch  if	 their	 name	appears   in   the   file
       /usr/lib/cron/at.allow.	If that file does not exist, the file /usr/lib/cron/at.deny shall
       be checked to determine whether the user shall be denied access to batch.  If neither file
       exists,	only  a process with the appropriate privileges shall be allowed to submit a job.
       If only at.deny exists and is empty, global usage shall be  permitted.  The  at.allow  and
       at.deny files shall consist of one user name per line.



       The  standard  input  shall  be a text file consisting of commands acceptable to the shell
       command language described in Shell Command Language .

       The text files /usr/lib/cron/at.allow and /usr/lib/cron/at.deny shall contain zero or more
       user  names,  one per line, of users who are, respectively, authorized or denied access to
       the at and batch utilities.

       The following environment variables shall affect the execution of batch:

       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.

	      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 and input files).

	      Determine the locale that should be used to affect the format and contents of diag-
	      nostic messages written to standard error and informative messages written to stan-
	      dard output.

	      Determine the format and contents for date and time strings written by batch.

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

       SHELL  Determine the name of a command interpreter to be used to invoke the at-job. If the
	      variable	is unset or null, sh shall be used.  If it is set to a value other than a
	      name for sh, the implementation shall do one of the following: use that shell;  use
	      sh; use the login shell from the user database; any of the preceding accompanied by
	      a warning diagnostic about which was chosen.

       TZ     Determine the timezone. The job shall be submitted for execution at the time speci-
	      fied  by timespec or -t time relative to the timezone specified by the TZ variable.
	      If timespec specifies a timezone, it overrides TZ . If timespec does not specify	a
	      timezone and TZ is unset or null, an unspecified default timezone shall be used.


       When standard input is a terminal, prompts of unspecified format for each line of the user
       input described in the STDIN section may be written to standard output.

       The following shall be written to standard error when a job has been successfully  submit-

	      "job %s at %s\n", at_job_id, <date>

       where date shall be equivalent in format to the output of:

	      date +"%a %b %e %T %Y"

       The  date  and  time  written shall be adjusted so that they appear in the timezone of the
       user (as determined by the TZ variable).

       Neither this, nor warning messages concerning the selection of  the  command  interpreter,
       are considered a diagnostic that changes the exit status.

       Diagnostic messages, if any, shall be written to standard error.



       The following exit values shall be returned:

	0     Successful completion.

       >0     An error occurred.

       The job shall not be scheduled.

       The following sections are informative.

       It may be useful to redirect standard output within the specified commands.

	1. This sequence can be used at a terminal:

	   sort < file >outfile

	2. This sequence, which demonstrates redirecting standard error to a pipe, is useful in a
	   command procedure (the sequence of output redirection specifications is significant):

	   batch <<
	   ! diff file1 file2 2>&1 >outfile | mailx mygroup

       Early proposals described batch in a manner totally separated from  at,	even  though  the
       historical  model  treated  it  almost  as a synonym for at -qb. A number of features were
       added to list and control batch work separately from those in at. Upon further reflection,
       it  was decided that the benefit of this did not merit the change to the historical inter-

       The -m option was included on the equivalent at command because it is historical  practice
       to  mail  results  to  the  submitter,  even  if all job-produced output is redirected. As
       explained in the RATIONALE for at, the now keyword submits the job for immediate execution
       (after  scheduling  delays),  despite some historical systems where at now would have been
       considered an error.



       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					 BATCH(P)
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