A batch job is deleted by sending a request to the batch server that manages the
batch job. A batch job that has been deleted is no longer subject to
management by batch services.
The qdel utility is a user-accessible client of batch services that
requests the deletion of one or more batch jobs.
The qdel utility shall request a batch server to delete those batch jobs
for which a batch job_identifier is presented to the utility.
The qdel utility shall delete batch jobs in the order in which their
batch job_identifiers are presented to the utility.
If the qdel utility fails to process any batch job_identifier
successfully, the utility shall proceed to process the remaining batch
job_identifiers, if any.
The qdel utility shall delete each batch job by sending a DeleteJob Request to the batch server that manages the batch job.
The qdel utility shall not exit until the batch job corresponding to each
successfully processed batch job_identifier has been deleted.
The following environment variables shall affect the execution of qdel:
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, 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).
Determine the locale that should be used to affect the
format and contents of diagnostic messages written to standard error.
In addition to the default behavior, the qdel utility shall not be
required to write a diagnostic message to standard error when the error reply
received from a batch server indicates that the batch job_identifier
does not exist on the server. Whether or not the qdel utility waits to
output the diagnostic message while attempting to locate the job on other
servers is implementation-defined.
The following sections are informative.
The qdel utility allows users and administrators to delete jobs.
The qdel utility provides functionality that is not otherwise available.
For example, the kill utility of the operating system does not suffice.
First, to use the kill utility, the user might have to log in on a
remote node, because the kill utility does not operate across the
network. Second, unlike qdel, kill cannot remove jobs from
queues. Lastly, the arguments of the qdel utility are job identifiers
rather than process identifiers, and so this utility can be passed the output
of the qselect utility, thus providing users with a means of deleting a
list of jobs.
Because a set of jobs can be selected using the qselect utility, the
qdel utility has not been complicated with options that provide for
selection of jobs. Instead, the batch jobs to be deleted are identified
individually by their job identifiers.
Historically, the qdel utility has been a component of NQS, the existing
practice on which it is based. However, the qdel utility defined in
this volume of IEEE Std 1003.1-2001 does not provide an option
for specifying a signal number to send to the batch job prior to the killing
of the process; that capability has been subsumed by the qsig utility.
A discussion was held about the delays of networking and the possibility that
the batch server may never respond, due to a down router, down batch server,
or other network mishap. The DESCRIPTION records this under the words
"fails to process any job identifier". In the broad sense, the
network problem is also an error, which causes the failure to process the
batch job identifier.
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 original
Standard can be obtained online at http://www.opengroup.org/unix/online.html