qselect [-a [op]date_time] [-A account_string] [-c [op]interval]
[-h hold_list] [-l resource_list] [-N name] [-p [op]priority]
[-q destination] [-r y|n] [-s states] [-u user_list]
Upon successful completion, the qselect utility shall have returned a list of zero or more batch job_identifiers that meet the criteria specified by the options and option-arguments presented to the utility.
The qselect utility shall select batch jobs by sending a Select Jobs Request to a batch server. The qselect utility shall not exit until the server replies to each request generated.
For each option presented to the qselect utility, the utility shall restrict the set of selected batch jobs as described in the OPTIONS section.
The qselect utility shall not restrict selection of batch jobs except by authorization and as required by the options presented to the utility.
When an option is specified with a mandatory or optional op component to the option-argument, then op shall specify a relation between the value of a certain batch job attribute and the value component of the option-argument. If an op is allowable on an option, then the description of the option letter indicates the op as either mandatory or optional. Acceptable strings for the op component, and the relation the string indicates, are shown in the following list:
The following options shall be supported by the implementation:
The qselect utility shall select only batch jobs for which the value of the Execution_Time attribute is related to the Epoch equivalent of the local time expressed by the value of the date_time component of the option-argument in the manner indicated by the value of the op component of the option-argument.
The qselect utility shall accept a date_time component of the option-argument that conforms to the syntax of the time operand of the touch utility.
If the op component of the option-argument is not presented to the qselect utility, the utility shall select batch jobs for which the Execution_Time attribute is equal to the date_time component of the option-argument.
When comparing times, the qselect utility shall use the following definitions for the op component of the option-argument:
The qselect utility shall accept the defined character strings for the op component of the option-argument.
The qselect utility shall select only batch jobs for which the value of the Account_Name attribute of the batch job matches the value of the account_string option-argument.
The syntax of the account_string option-argument is unspecified.
The qselect utility shall select only batch jobs for which the value of the Checkpoint attribute relates to the value of the interval component of the option-argument in the manner indicated by the value of the op component of the option-argument.
If the op component of the option-argument is omitted, the qselect utility shall select batch jobs for which the value of the Checkpoint attribute is equal to the value of the interval component of the option-argument.
When comparing checkpoint intervals, the qselect utility shall use the following definitions for the op component of the option-argument:
The qselect utility shall accept the defined character strings for the op component of the option-argument.
The ordering relationship for the values of the interval option-argument is defined to be:
`n' .gt. `s' .gt. `c=minutes' .ge. `c'
The qselect utility shall select only batch jobs for which the value of the Hold_Types attribute matches the value of the hold_list option-argument.
The qselect -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 POSIX.1-2017, Section 6.1, Portable Character Set).
The qselect 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'.
Each unique character in the hold_list option-argument of the qselect utility is defined 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.
The qselect 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 qselect 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.
The qselect utility shall accept a resource_list option-argument with the following syntax:
resource_name op value [,,resource_name op value,, ...]
When comparing resource values, the qselect utility shall use the following definitions for the op component of the option-argument:
When comparing the limit of a Resource_List attribute with the value component of the option-argument, if the limit, the value, or both are non-numeric, only equality or inequality are valid comparisons.
The qselect utility shall select only batch jobs for which the values of the resource_names listed in the resource_list option-argument match the corresponding limits of the Resource_List attribute of the batch job.
Limits of resource_names present in the Resource_List attribute of the batch job that have no corresponding values in the resource_list option-argument shall not be considered when selecting batch jobs.
The qselect utility shall select only batch jobs for which the value of the Job_Name attribute matches the value of the name option-argument. The string specified in the name option-argument shall be passed, uninterpreted, to the server. This allows an implementation to match ``wildcard'' patterns against batch job names.
An implementation shall describe in the conformance document the format it supports for matching against the Job_Name attribute.
The qselect utility shall select only batch jobs for which the value of the Priority attribute of the batch job relates to the value of the priority component of the option-argument in the manner indicated by the value of the op component of the option-argument.
If the op component of the option-argument is omitted, the qselect utility shall select batch jobs for which the value of the Priority attribute of the batch job is equal to the value of the priority component of the option-argument.
When comparing priority values, the qselect utility shall use the following definitions for the op component of the option-argument:
The qselect utility shall select only batch jobs that are located at the destination indicated by the value of the destination option-argument.
The destination defines a batch queue, a server, or a batch queue at a server.
The qselect utility shall accept an option-argument for the -q option that conforms to the syntax for a destination. If the -q option is not presented to the qselect utility, the utility shall select batch jobs from all batch queues at the default batch server.
If the option-argument describes only a batch queue, the qselect utility shall select only batch jobs from the batch queue of the specified name at the default batch server. The means by which qselect determines the default server is implementation-defined.
If the option-argument describes only a batch server, the qselect utility shall select batch jobs from all the batch queues at that batch server.
If the option-argument describes both a batch queue and a batch server, the qselect utility shall select only batch jobs from the specified batch queue at the specified server.
The qselect utility shall select only batch jobs for which the value of the Rerunable attribute of the batch job matches the value of the option-argument.
The qselect utility shall accept a value for the option-argument that consists of either the single character 'y' or the single character 'n'. The character 'y' represents the value TRUE, and the character 'n' represents the value FALSE.
The qselect utility shall accept an option-argument that consists of any combination of the characters 'e', 'q', 'r', 'w', 'h', and 't'.
Conforming applications shall not repeat any character in the option-argument. The qselect utility shall permit the repetition of characters in the option-argument, but shall not assign additional meaning to repeated characters.
The qselect utility shall interpret the characters in the states option-argument as follows:
For each character in the states option-argument, the qselect utility shall select batch jobs in the corresponding state.
The qselect utility shall select only the batch jobs of those users specified in the user_list option-argument.
The qselect utility shall accept a user_list option-argument that conforms to the following syntax:
username[@host][,,username[@host],, ...]
The qselect utility shall accept only one user name that is missing a corresponding host name. The qselect utility shall accept only one user name per named host.
The qselect utility shall separate the batch job_identifiers written to standard output by white space.
The qselect utility shall write batch job_identifiers in the following format:
sequence_number.server_name@server
The following sections are informative.
qdel $(qselect -s q)
or:
qselect -s q || xargs qdel
The options of the qselect utility let the user apply a number of useful filters for selecting jobs. Each option further restricts the selection of jobs. Many of the selection options allow the specification of a relational operator. The FORTRAN-like syntax of the operator---that is, ".lt."---was chosen rather than the C-like "<=" meta-characters.
The -a option allows users to restrict the selected jobs to those that have been submitted (or altered) to wait until a particular time. The time period is determined by the argument of this option, which includes both a time and an operator---it is thus possible to select jobs waiting until a specific time, jobs waiting until after a certain time, or those waiting for a time before the specified time.
The -A option allows users to restrict the selected jobs to those that have been submitted (or altered) to charge a particular account.
The -c option allows users to restrict the selected jobs to those whose checkpointing interval falls within the specified range.
The -l option allows users to select those jobs whose resource limits fall within the range indicated by the value of the option. For example, a user could select those jobs for which the CPU time limit is greater than two hours.
The -N option allows users to select jobs by job name. For instance, all the parts of a task that have been divided in parallel jobs might be given the same name, and thus manipulated as a group by means of this option.
The -q option allows users to select jobs in a specified queue.
The -r option allows users to select only those jobs with a specified rerun criteria. For instance, a user might select only those jobs that can be rerun for use with the qrerun utility.
The -s option allows users to select only those jobs that are in a certain state.
The -u option allows users to select jobs that have been submitted to execute under a particular account.
The selection criteria provided by the options of the qselect utility allow users to select jobs based on all the appropriate attributes that can be assigned to jobs by the qsub utility.
Historically, the qselect utility has not been a part of existing practice; it is an improvement that has been introduced in this volume of POSIX.1-2017.
The Base Definitions volume of POSIX.1-2017, Section 6.1, Portable Character Set, Chapter 8, Environment Variables, Section 12.2, Utility Syntax Guidelines
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