A hold is placed on a batch job by a request to the batch server that manages
the batch job. A batch job that has one or more holds is not eligible for
execution. The qhold utility is a user-accessible client of batch
services that requests one or more types of hold to be placed on one or more
The qhold utility shall place holds on those batch jobs for which a batch
job_identifier is presented to the utility.
The qhold utility shall place holds on batch jobs in the order in which
their batch job_identifiers are presented to the utility. If the
qhold utility fails to process any batch job_identifier
successfully, the utility shall proceed to process the remaining batch
job_identifiers, if any.
The qhold utility shall place holds on each batch job by sending a
Hold Job Request to the batch server that manages the batch job.
The qhold utility shall not exit until holds have been placed on the
batch job corresponding to each successfully processed batch
The qhold utility shall conform to the Base Definitions volume of
IEEE Std 1003.1-2001, Section 12.2, Utility Syntax Guidelines.
The following option shall be supported by the implementation:
Define the types of holds to be placed on the batch
The qhold-h option shall accept a value for the hold_list
option-argument that is a string of alphanumeric characters in the portable
character set (see the Base Definitions volume of
IEEE Std 1003.1-2001, Section 6.1, Portable Character Set).
The qhold utility shall accept a value for the hold_list
option-argument that is a string of one or more of the characters 'u' ,
's' , or 'o' , or the single character 'n' .
For each unique character in the hold_list option-argument, the
qhold utility shall add a value to the Hold_Types attribute of
the batch job as follows, each representing a different hold type:
If any of these characters are duplicated in the hold_list
option-argument, the duplicates shall be ignored.
An existing Hold_Types attribute can be cleared by the following hold
The qhold utility shall consider it an error if any hold type other than
'n' is combined with hold type 'n' .
Strictly conforming applications shall not repeat any of the characters
'u' , 's' , 'o' , or 'n' within the
hold_list option-argument. The qhold utility shall permit the
repetition of characters, but shall not assign additional meaning to the
An implementation may define other hold types. The conformance document for an
implementation shall describe any additional hold types, how they are
specified, their internal behavior, and how they affect the behavior of the
If the -h option is not presented to the qhold utility, the
implementation shall set the Hold_Types attribute to USER.
The following environment variables shall affect the execution of qhold:
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 qhold 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 qhold 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 qhold utility allows users to place a hold on one or more jobs. A
hold makes a batch job ineligible for execution.
The qhold utility has options that allow the user to specify the type of
hold. Should the user wish to place a hold on a set of jobs that meet a
selection criteria, such a list of jobs can be acquired using the
The -h option allows the user to specify the type of hold that is to be
placed on the job. This option allows for USER, SYSTEM, OPERATOR, and
implementation-defined hold types. The USER and OPERATOR holds are distinct.
The batch server that manages the batch job will verify that the user is
authorized to set the specified hold for the batch job.
Mail is not required on hold because the administrator has the tools and
libraries to build this option if he or she wishes.
Historically, the qhold utility has been a part of some existing batch
systems, although it has not traditionally been a part of the NQS.
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