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NAME
qalter - alter batch job
SYNOPSIS
qalter [-a date_time][-A account_string][-c interval][-e path_name]
[-h hold_list][-j join_list][-k keep_list][-l resource_list]
[-m mail_options][-M mail_list][-N name][-o path_name]
[-p priority][-r y|n][-S path_name_list][-u user_list]
job_identifier ...
DESCRIPTION
The attributes of a batch job are altered by a request to the batch server that manages the batch job.
The qalter utility is a user-accessible batch client that requests the alteration of the attributes of
one or more batch jobs.
The qalter utility shall alter the attributes of those batch jobs, and only those batch jobs, for which a
batch job_identifier is presented to the utility.
The qalter utility shall alter the attributes of batch jobs in the order in which the batch
job_identifiers are presented to the utility.
If the qalter utility fails to process a batch job_identifier successfully, the utility shall proceed to
process the remaining batch job_identifiers, if any.
For each batch job_identifier for which the qalter utility succeeds, each attribute of the identified
batch job shall be altered as indicated by all the options presented to the utility.
For each identified batch job for which the qalter utility fails, the utility shall not alter any
attribute of the batch job.
For each batch job that the qalter utility processes, the utility shall not modify any attribute other
than those required by the options and option-arguments presented to the utility.
The qalter utility shall alter batch jobs by sending a Modify Job Request to the batch server that
manages each batch job. At the time the qalter utility exits, it shall have modified the batch job
corresponding to each successfully processed batch job_identifier. An attempt to alter the attributes of
a batch job in the RUNNING state is implementation-defined.
OPTIONS
The qalter utility shall conform to the Base Definitions volume of IEEE Std 1003.1-2001, Section 12.2,
Utility Syntax Guidelines.
The following options shall be supported by the implementation:
-a date_time
Redefine the time at which the batch job becomes eligible for execution.
The date_time argument shall be in the same form and represent the same time as for the touch utility.
The time so represented shall be set into the Execution_Time attribute of the batch job. If the time
specified is earlier than the current time, the -a option shall have no effect.
-A account_string
Redefine the account to which the resource consumption of the batch job should be charged.
The syntax of the account_string option-argument is unspecified.
The qalter utility shall set the Account_Name attribute of the batch job to the value of the
account_string option-argument.
-c interval
Redefine whether the batch job should be checkpointed, and if so, how often.
The qalter utility shall accept a value for the interval option-argument that is one of the following:
n
No checkpointing is to be performed on the batch job (NO_CHECKPOINT).
s
Checkpointing is to be performed only when the batch server is shut down (CHECKPOINT_AT_SHUTDOWN).
c
Automatic periodic checkpointing is to be performed at the Minimum_Cpu_Interval attribute of the
batch queue, in units of CPU minutes (CHECKPOINT_AT_MIN_CPU_INTERVAL).
c=minutes
Automatic periodic checkpointing is to be performed every minutes of CPU time, or every
Minimum_Cpu_Interval minutes, whichever is greater. The minutes argument shall conform to the
syntax for unsigned integers and shall be greater than zero.
An implementation may define other checkpoint intervals. The conformance document for an implementation
shall describe any alternative checkpoint intervals, how they are specified, their internal behavior, and
how they affect the behavior of the utility.
The qalter utility shall set the Checkpoint attribute of the batch job to the value of the interval
option-argument.
-e path_name
Redefine the path to be used for the standard error stream of the batch job.
The qalter utility shall accept a path_name option-argument that conforms to the syntax of the path_name
element defined in the System Interfaces volume of IEEE Std 1003.1-2001, which can be preceded by a host
name element of the form hostname:.
If the path_name option-argument constitutes an absolute pathname, the qalter utility shall set the
Error_Path attribute of the batch job to the value of the path_name option-argument, including the host
name element, if present.
If the path_name option-argument constitutes a relative pathname and no host name element is specified,
the qalter utility shall set the Error_Path attribute of the batch job to the value of the absolute
pathname derived by expanding the path_name option-argument relative to the current directory of the
process that executes the qalter utility.
If the path_name option-argument constitutes a relative pathname and a host name element is specified,
the qalter utility shall set the Error_Path attribute of the batch job to the value of the option-
argument without expansion.
If the path_name option-argument does not include a host name element, the qalter utility shall prefix
the pathname in the Error_Path attribute with hostname:, where hostname is the name of the host upon
which the qalter utility is being executed.
-h hold_list
Redefine the types of holds, if any, on the batch job. The qalter -h option shall accept a value
for the hold_list option-argument that is a string of alphanumeric characters in the portable
character set.
The qalter 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 qalter 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 hold type:
n
NO_HOLD
The qalter 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 qalter 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 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 utility.
-j join_list
Redefine which streams of the batch job are to be merged. The qalter -j option shall accept a
value for the join_list option-argument that is a string of alphanumeric characters in the
portable character set.
The qalter utility shall accept a join_list option-argument that consists of one or more of the
characters 'e' and 'o' , or the single character 'n' .
All of the other batch job output streams specified shall be merged into the output stream represented by
the character listed first in the join_list option-argument.
For each unique character in the join_list option-argument, the qalter utility shall add a value to the
Join_Path attribute of the batch job as follows, each representing a different batch job stream to join:
e
The standard error of the batch job (JOIN_STD_ERROR).
o
The standard output of the batch job (JOIN_STD_OUTPUT).
An existing Join_Path attribute can be cleared by the join type:
n
NO_JOIN
If 'n' is specified, then no files are joined. The qalter utility shall consider it an error if any join
type other than 'n' is combined with join type 'n' .
Strictly conforming applications shall not repeat any of the characters 'e' , 'o' , or 'n' within the
join_list option-argument. The qalter utility shall permit the repetition of characters, but shall not
assign additional meaning to the repeated characters.
An implementation may define other join types. The conformance document for an implementation shall
describe any additional batch job streams, how they are specified, their internal behavior, and how they
affect the behavior of the utility.
-k keep_list
Redefine which output of the batch job to retain on the execution host.
The qalter -k option shall accept a value for the keep_list option-argument that is a string of
alphanumeric characters in the portable character set.
The qalter utility shall accept a keep_list option-argument that consists of one or more of the
characters 'e' and 'o' , or the single character 'n' .
For each unique character in the keep_list option-argument, the qalter utility shall add a value to the
Keep_Files attribute of the batch job as follows, each representing a different batch job stream to keep:
e
The standard error of the batch job (KEEP_STD_ERROR).
o
The standard output of the batch job (KEEP_STD_OUTPUT).
If both 'e' and 'o' are specified, then both files are retained. An existing Keep_Files attribute can be
cleared by the keep type:
n
NO_KEEP
If 'n' is specified, then no files are retained. The qalter utility shall consider it an error if any
keep type other than 'n' is combined with keep type 'n' .
Strictly conforming applications shall not repeat any of the characters 'e' , 'o' , or 'n' within the
keep_list option-argument. The qalter utility shall permit the repetition of characters, but shall not
assign additional meaning to the repeated characters. An implementation may define other keep types. The
conformance document for an implementation shall describe any additional keep types, how they are
specified, their internal behavior, and how they affect the behavior of the utility.
-l resource_list
Redefine the resources that are allowed or required by the batch job.
The qalter utility shall accept a resource_list option-argument that conforms to the following syntax:
resource=value[,,resource=value,,...]
The qalter utility shall set one entry in the value of the Resource_List attribute of the batch job for
each resource listed in the resource_list option-argument.
Because the list of supported resource names might vary by batch server, the qalter utility shall rely on
the batch server to validate the resource names and associated values. See Multiple Keyword-Value Pairs
for a means of removing keyword= value (and value@ keyword) pairs and other general rules for list-
oriented batch job attributes.
-m mail_options
Redefine the points in the execution of the batch job at which the batch server is to send mail
about a change in the state of the batch job.
The qalter -m option shall accept a value for the mail_options option-argument that is a string of
alphanumeric characters in the portable character set.
The qalter utility shall accept a value for the mail_options option-argument that is a string of one or
more of the characters 'e' , 'b' , and 'a' , or the single character 'n' . For each unique character in
the mail_options option-argument, the qalter utility shall add a value to the Mail_Users attribute of the
batch job as follows, each representing a different time during the life of a batch job at which to send
mail:
e
MAIL_AT_EXIT
b
MAIL_AT_BEGINNING
a
MAIL_AT_ABORT
If any of these characters are duplicated in the mail_options option-argument, the duplicates shall be
ignored.
An existing Mail_Points attribute can be cleared by the mail type:
n
NO_MAIL
If 'n' is specified, then mail is not sent. The qalter utility shall consider it an error if any mail
type other than 'n' is combined with mail type 'n' . Strictly conforming applications shall not repeat
any of the characters 'e' , 'b' , 'a' , or 'n' within the mail_options option-argument. The qalter
utility shall permit the repetition of characters but shall not assign additional meaning to the repeated
characters.
An implementation may define other mail types. The conformance document for an implementation shall
describe any additional mail types, how they are specified, their internal behavior, and how they affect
the behavior of the utility.
-M mail_list
Redefine the list of users to which the batch server that executes the batch job is to send mail,
if the batch server sends mail about the batch job.
The syntax of the mail_list option-argument is unspecified. If the implementation of the qalter utility
uses a name service to locate users, the utility shall accept the syntax used by the name service.
If the implementation of the qalter utility does not use a name service to locate users, the
implementation shall accept the following syntax for user names:
mail_address[,,mail_address,,...]
The interpretation of mail_address is implementation-defined.
The qalter utility shall set the Mail_Users attribute of the batch job to the value of the mail_list
option-argument.
-N name
Redefine the name of the batch job.
The qalter -N option shall accept a value for the name option-argument that is a string of up to 15
alphanumeric characters in the portable character set where the first character is alphabetic.
The syntax of the name option-argument is unspecified.
The qalter utility shall set the Job_Name attribute of the batch job to the value of the name option-
argument.
-o path_name
Redefine the path for the standard output of the batch job.
The qalter utility shall accept a path_name option-argument that conforms to the syntax of the path_name
element defined in the System Interfaces volume of IEEE Std 1003.1-2001, which can be preceded by a host
name element of the form hostname:.
If the path_name option-argument constitutes an absolute pathname, the qalter utility shall set the
Output_Path attribute of the batch job to the value of the path_name option-argument.
If the path_name option-argument constitutes a relative pathname and no host name element is specified,
the qalter utility shall set the Output_Path attribute of the batch job to the absolute pathname derived
by expanding the path_name option-argument relative to the current directory of the process that executes
the qalter utility.
If the path_name option-argument constitutes a relative pathname and a host name element is specified,
the qalter utility shall set the Output_Path attribute of the batch job to the value of the path_name
option-argument without any expansion of the pathname.
If the path_name option-argument does not include a host name element, the qalter utility shall prefix
the pathname in the Output_Path attribute with hostname:, where hostname is the name of the host upon
which the qalter utility is being executed.
-p priority
Redefine the priority of the batch job.
The qalter utility shall accept a value for the priority option-argument that conforms to the syntax for
signed decimal integers, and which is not less than -1024 and not greater than 1023.
The qalter utility shall set the Priority attribute of the batch job to the value of the priority option-
argument.
-r y|n
Redefine whether the batch job is rerunnable.
If the value of the option-argument is 'y' , the qalter utility shall set the Rerunable attribute of the
batch job to TRUE.
If the value of the option-argument is 'n' , the qalter utility shall set the Rerunable attribute of the
batch job to FALSE.
The qalter utility shall consider it an error if any character other than 'y' or 'n' is specified in the
option-argument.
-S path_name_list
Redefine the shell that interprets the script at the destination system.
The qalter utility shall accept a path_name_list option-argument that conforms to the following syntax:
pathname[@host][,pathname[@host],...]
The qalter utility shall accept only one pathname that is missing a corresponding host name. The qalter
utility shall allow only one pathname per named host.
The qalter utility shall add a value to the Shell_Path_List attribute of the batch job for each entry in
the path_name_list option-argument. See Multiple Keyword-Value Pairs for a means of removing keyword=
value (and value@ keyword) pairs and other general rules for list-oriented batch job attributes.
-u user_list
Redefine the user name under which the batch job is to run at the destination system.
The qalter utility shall accept a user_list option-argument that conforms to the following syntax:
username[@host][,,username[@host],,...]
The qalter utility shall accept only one user name that is missing a corresponding host name. The qalter
utility shall accept only one user name per named host.
The qalter utility shall add a value to the User_List attribute of the batch job for each entry in the
user_list option-argument. See Multiple Keyword-Value Pairs for a means of removing keyword= value (and
value@ keyword) pairs and other general rules for list-oriented batch job attributes.
OPERANDS
The qalter utility shall accept one or more operands that conform to the syntax for a batch
job_identifier (see Batch Job Identifier ).
STDIN
Not used.
INPUT FILES
None.
ENVIRONMENT VARIABLES
The following environment variables shall affect the execution of qalter:
LANG 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.)
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.
TZ Determine the timezone used to interpret the date-time option-argument. If TZ is unset or null,
an unspecified default timezone shall be used.
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 qalter 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 qalter utility attempts to locate the
batch job on other batch servers is implementation-defined.
The following sections are informative.
APPLICATION USAGE
None.
EXAMPLES
None.
RATIONALE
The qalter utility allows users to change the attributes of a batch job.
As a means of altering a queued job, the qalter utility is superior to deleting and requeuing the batch
job insofar as an altered job retains its place in the queue with some traditional selection algorithms.
In addition, the qalter utility is both shorter and simpler than a sequence of qdel and qsub utilities.
The result of an attempt on the part of a user to alter a batch job in a RUNNING state is implementation-
defined because a batch job in the RUNNING state will already have opened its output files and otherwise
performed any actions indicated by the options in effect at the time the batch job began execution.
The options processed by the qalter utility are identical to those of the qsub utility, with a few
exceptions: -V, -v, and -q. The -V and -v are inappropriate for the qalter utility, since they capture
potentially transient environment information from the submitting process. The -q option would specify a
new queue, which would largely negate the previously stated advantage of using qalter; furthermore, the
qmove utility provides a superior means of moving jobs.
Each of the following paragraphs provides the rationale for a qalter option.
Additional rationale concerning these options can be found in the rationale for the qsub utility.
The -a option allows users to alter the date and time at which a batch job becomes eligible to run.
The -A option allows users to change the account that will be charged for the resources consumed by the
batch job. Support for the -A option is mandatory for conforming implementations of qalter, even though
support of accounting is optional for servers. Whether or not to support accounting is left to the
implementor of the server, but mandatory support of the -A option assures users of a consistent interface
and allows them to control accounting on servers that support accounting.
The -c option allows users to alter the checkpointing interval of a batch job. A checkpointing system,
which is not defined by IEEE Std 1003.1-2001, allows recovery of a batch job at the most recent
checkpoint in the event of a crash. Checkpointing is typically used for jobs that consume expensive
computing time or must meet a critical schedule. Users should be allowed to make the tradeoff between the
overhead of checkpointing and the risk to the timely completion of the batch job; therefore, this volume
of IEEE Std 1003.1-2001 provides the checkpointing interval option. Support for checkpointing is optional
for servers.
The -e option allows users to alter the name and location of the standard error stream written by a batch
job. However, the path of the standard error stream is meaningless if the value of the Join_Path
attribute of the batch job is TRUE.
The -h option allows users to set the hold type in the Hold_Types attribute of a batch job. The qhold and
qrls utilities add or remove hold types to the Hold_Types attribute, respectively. The -h option has been
modified to allow for implementation-defined hold types.
The -j option allows users to alter the decision to join (merge) the standard error stream of the batch
job with the standard output stream of the batch job.
The -l option allows users to change the resource limits imposed on a batch job.
The -m option allows users to modify the list of points in the life of a batch job at which the
designated users will receive mail notification.
The -M option allows users to alter the list of users who will receive notification about events in the
life of a batch job.
The -N option allows users to change the name of a batch job.
The -o option allows users to alter the name and path to which the standard output stream of the batch
job will be written.
The -P option allows users to modify the priority of a batch job. Support for priority is optional for
batch servers.
The -r option allows users to alter the rerunability status of a batch job.
The -S option allows users to change the name and location of the shell image that will be invoked to
interpret the script of the batch job. This option has been modified to allow a list of shell name and
locations associated with different hosts.
The -u option allows users to change the user identifier under which the batch job will execute.
The job_identifier operand syntax is provided so that the user can differentiate between the originating
and destination (or executing) batch server. These may or may not be the same. The . server_name portion
identifies the originating batch server, while the @ server portion identifies the destination batch
server.
Historically, the qalter utility has been a component of the Network Queuing System (NQS), the existing
practice from which this utility has been derived.
FUTURE DIRECTIONS
None.
SEE ALSO
Batch Environment Services , qdel , qhold , qmove , qrls , qsub , touch
COPYRIGHT
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 .
IEEE/The Open Group 2003 QALTER(P)