QHOLD(1P) POSIX Programmer's Manual QHOLD(1P)PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux
implementation of this interface may differ (consult the corresponding
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NAMEqhold — hold batch jobs
SYNOPSISqhold [−h hold_list] job_identifier...
DESCRIPTION
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 batch jobs.
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 job_iden‐
tifier.
OPTIONS
The qhold utility shall conform to the Base Definitions volume of
POSIX.1‐2008, Section 12.2, Utility Syntax Guidelines.
The following option shall be supported by the implementation:
−h hold_list
Define the types of holds to be placed on the batch job.
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 vol‐
ume of POSIX.1‐2008, 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 char‐
acters '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:
u USER
s SYSTEM
o OPERATOR
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 fol‐
lowing hold type:
n NO_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
repeated characters.
An implementation may define other hold types. The confor‐
mance document for an implementation shall describe any addi‐
tional hold types, how they are specified, their internal
behavior, and how they affect the behavior of the utility.
If the −h option is not presented to the qhold utility, the
implementation shall set the Hold_Types attribute to USER.
OPERANDS
The qhold utility shall accept one or more operands that conform to the
syntax for a batch job_identifier (see Section 3.3.1, Batch Job Identi‐
fier).
STDIN
Not used.
INPUT FILES
None.
ENVIRONMENT VARIABLES
The following environment variables shall affect the execution of
qhold:
LANG Provide a default value for the internationalization vari‐
ables that are unset or null. (See the Base Definitions vol‐
ume of POSIX.1‐2008, Section 8.2, Internationalization Vari‐
ables 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).
LC_MESSAGES
Determine the locale that should be used to affect the format
and contents of diagnostic messages written to standard
error.
LOGNAME Determine the login name of the user.
ASYNCHRONOUS EVENTS
Default.
STDOUT
None.
STDERR
The standard error shall be used only for diagnostic messages.
OUTPUT FILES
None.
EXTENDED DESCRIPTION
None.
EXIT STATUS
The following exit values shall be returned:
0 Successful completion.
>0 An error occurred.
CONSEQUENCES OF ERRORS
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_identi‐
fier 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.
APPLICATION USAGE
None.
EXAMPLES
None.
RATIONALE
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 qselect utility.
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 dis‐
tinct. 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.
FUTURE DIRECTIONS
The qhold utility may be removed in a future version.
SEE ALSO
Chapter 3, Batch Environment Services, qselect
The Base Definitions volume of POSIX.1‐2008, Section 6.1, Portable
Character Set, Chapter 8, Environment Variables, Section 12.2, Utility
Syntax Guidelines
COPYRIGHT
Portions 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 Electri‐
cal 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 http://www.unix.org/online.html .
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IEEE/The Open Group 2013 QHOLD(1P)
