PROLOGThis manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.
NAMEbatch --- schedule commands to be executed in a batch queue
DESCRIPTIONThe 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
STDINThe standard input shall be a text file consisting of commands acceptable to the shell command language described in Chapter 2, Shell Command Language.
INPUT FILESThe 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.
ENVIRONMENT VARIABLESThe following environment variables shall affect the execution of batch:
- 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.)
- If set to a non-empty string value, override the values of all the other internationalization 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 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.
- 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.
- 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.
- 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.
STDOUTWhen 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.
STDERRThe following shall be written to standard error when a job has been successfully submitted:
"job %s at %s\n", at_job_id, <date>
date +"%a %b %e %T %Y"
EXIT STATUSThe following exit values shall be returned:
- Successful completion.
- An error occurred.
CONSEQUENCES OF ERRORSThe job shall not be scheduled.
The following sections are informative.
APPLICATION USAGEIt may be useful to redirect standard output within the specified commands.
This sequence can be used at a terminal:
batch sort < file >outfile EOT
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 !
RATIONALEEarly 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.
SEE ALSOat The Base Definitions volume of POSIX.1-2008, Chapter 8, Environment Variables
COPYRIGHTPortions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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 www.unix.org/online.html .
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