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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
submitted 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 at.allow which is
located in an implementation-defined directory. If that file does not exist, the file
at.deny, which is located in an implementation-defined directory, shall be checked to
determine whether the user shall be denied access to batch. If neither file exists, only
a process with 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 Chapter 2, Shell Command Language.


The text files at.allow and at.deny, which are located in an implementation-defined
directory, 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 POSIX.1‐2008, 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 and input files).

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

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

NLSPATH 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
specified 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

"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 interface.

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.



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