|BATCH(1P)||POSIX Programmer's Manual||BATCH(1P)|
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.
- 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.
"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.
- Successful completion.
- An error occurred.
The following sections are informative.
- 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 !
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.
The Base Definitions volume of POSIX.1‐2008, Chapter 8, Environment Variables
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|2013||IEEE/The Open Group|