xbd_chap03.html

IEEE 1003.1-2003, Single Unix Specification v3

<h3><a name="tag_03_40"></a>Basename</h3>

<p>The final, or only, filename in a pathname.</p>

<h3><a name="tag_03_41"></a>Basic Regular Expression (BRE)</h3>

<p>A regular expression (see <a href="#tag_03_316">Regular Expression</a> ) used by the majority of utilities that select strings
from a set of character strings. <basefont size="2"></p>

<dl>
<dt><b>Note:</b></dt>

<dd>Basic Regular Expressions are described in detail in <a href="xbd_chap09.html#tag_09_03"><i>Basic Regular Expressions</i></a>
.</dd>
</dl>

<basefont size="3"> 

<h3><a name="tag_03_42"></a>Batch Access List</h3>

<p>A list of user IDs and group IDs of those users and groups authorized to place batch jobs in a batch queue.</p>

<p>A batch access list is associated with a batch queue. A batch server uses the batch access list of a batch queue as one of the
criteria in deciding to put a batch job in a batch queue.</p>

<h3><a name="tag_03_43"></a>Batch Administrator</h3>

<p>A user that is authorized to modify all the attributes of queues and jobs and to change the status of a batch server.</p>

<h3><a name="tag_03_44"></a>Batch Client</h3>

<p>A computational entity that utilizes batch services by making requests of batch servers.</p>

<p>Batch clients often provide the means by which users access batch services, although a batch server may act as a batch client by
virtue of making requests of another batch server.</p>

<h3><a name="tag_03_45"></a>Batch Destination</h3>

<p>The batch server in a batch system to which a batch job should be sent for processing.</p>

<p>Acceptance of a batch job at a batch destination is the responsibility of a receiving batch server. A batch destination may
consist of a batch server-specific portion, a network-wide portion, or both. The batch server-specific portion is referred to as
the &quot;batch queue&quot;. The network-wide portion is referred to as a &quot;batch server name&quot;.</p>

<h3><a name="tag_03_46"></a>Batch Destination Identifier</h3>

<p>A string that identifies a specific batch destination.</p>

<p>A string of characters in the portable character set used to specify a particular batch destination. <basefont size="2"></p>

<dl>
<dt><b>Note:</b></dt>

<dd>The Portable Character Set is defined in detail in <a href="xbd_chap06.html#tag_06_01"><i>Portable Character Set</i></a> .</dd>
</dl>

<basefont size="3"> 

<h3><a name="tag_03_47"></a>Batch Directive</h3>

<p>A line from a file that is interpreted by the batch server. The line is usually in the form of a comment and is an additional
means of passing options to the <a href="../utilities/qsub.html"><i>qsub</i></a> utility. <basefont size="2"></p>

<dl>
<dt><b>Note:</b></dt>

<dd>The <a href="../utilities/qsub.html"><i>qsub</i></a> utility is defined in detail in the Shell and Utilities volume of
IEEE&nbsp;Std&nbsp;1003.1-2001.</dd>
</dl>

<basefont size="3"> 

<h3><a name="tag_03_48"></a>Batch Job</h3>

<p>A set of computational tasks for a computing system.</p>

<p>Batch jobs are managed by batch servers.</p>

<p>Once created, a batch job may be executing or pending execution. A batch job that is executing has an associated session leader
(a process) that initiates and monitors the computational tasks of the batch job.</p>

<h3><a name="tag_03_49"></a>Batch Job Attribute</h3>

<p>A named data type whose value affects the processing of a batch job.</p>

<p>The values of the attributes of a batch job affect the processing of that job by the batch server that manages the batch
job.</p>

<h3><a name="tag_03_50"></a>Batch Job Identifier</h3>

<p>A unique name for a batch job. A name that is unique among all other batch job identifiers in a batch system and that identifies
the batch server to which the batch job was originally submitted.</p>

<h3><a name="tag_03_51"></a>Batch Job Name</h3>

<p>A label that is an attribute of a batch job. The batch job name is not necessarily unique.</p>

<h3><a name="tag_03_52"></a>Batch Job Owner</h3>

<p>The <i>username</i>@ <i>hostname</i> of the user submitting the batch job, where <i>username</i> is a user name (see also <a
href="#tag_03_426">User Name</a> ) and <i>hostname</i> is a network host name.</p>

<h3><a name="tag_03_53"></a>Batch Job Priority</h3>

<p>A value specified by the user that may be used by an implementation to determine the order in which batch jobs are selected to
be executed. Job priority has a numeric value in the range -1024 to 1023. <basefont size="2"></p>

<dl>
<dt><b>Note:</b></dt>

<dd>The batch job priority is not the execution priority (nice value) of the batch job.</dd>
</dl>

<basefont size="3"> 

<h3><a name="tag_03_54"></a>Batch Job State</h3>

<p>An attribute of a batch job which determines the types of requests that the batch server that manages the batch job can accept
for the batch job. Valid states include QUEUED, RUNNING, HELD, WAITING, EXITING, and TRANSITING.</p>

<h3><a name="tag_03_55"></a>Batch Name Service</h3>

<p>A service that assigns batch names that are unique within the batch name space, and that can translate a unique batch name into
the location of the named batch entity.</p>

<h3><a name="tag_03_56"></a>Batch Name Space</h3>

<p>The environment within which a batch name is known to be unique.</p>

<h3><a name="tag_03_57"></a>Batch Node</h3>

<p>A host containing part or all of a batch system.</p>

<p>A batch node is a host meeting at least one of the following conditions:</p>

<ul>
<li>
<p>Capable of executing a batch client</p>
</li>

<li>
<p>Contains a routing batch queue</p>
</li>

<li>
<p>Contains an execution batch queue</p>
</li>
</ul>

<h3><a name="tag_03_58"></a>Batch Operator</h3>

<p>A user that is authorized to modify some, but not all, of the attributes of jobs and queues, and may change the status of the
batch server.</p>

<h3><a name="tag_03_59"></a>Batch Queue</h3>

<p>A manageable object that represents a set of batch jobs and is managed by a single batch server. <basefont size="2"></p>

<dl>
<dt><b>Note:</b></dt>

<dd>A set of batch jobs is called a batch queue largely for historical reasons. Jobs are selected from the batch queue for
execution based on attributes such as priority, resource requirements, and hold conditions. 

<p>See also the Shell and Utilities volume of IEEE&nbsp;Std&nbsp;1003.1-2001, <a href=
"../utilities/xcu_chap03.html#tag_03_01_02">Section 3.1.2, Batch Queues</a>.</p>
</dd>
</dl>

<basefont size="3"> 

<h3><a name="tag_03_60"></a>Batch Queue Attribute</h3>

<p>A named data type whose value affects the processing of all batch jobs that are members of the batch queue.</p>

<p>A batch queue has attributes that affect the processing of batch jobs that are members of the batch queue.</p>

<h3><a name="tag_03_61"></a>Batch Queue Position</h3>

<p>The place, relative to other jobs in the batch queue, occupied by a particular job in a batch queue. This is defined in part by
submission time and priority; see also <a href="#tag_03_62">Batch Queue Priority</a> .</p>

<h3><a name="tag_03_62"></a>Batch Queue Priority</h3>

<p>The maximum job priority allowed for any batch job in a given batch queue.</p>

<p>The batch queue priority is set and may be changed by users with appropriate privilege. The priority is bounded in an
implementation-defined manner.</p>

<h3><a name="tag_03_63"></a>Batch Rerunability</h3>

<p>An attribute of a batch job indicating that it may be rerun after an abnormal termination from the beginning without affecting
the validity of the results.</p>

<h3><a name="tag_03_64"></a>Batch Restart</h3>

<p>The action of resuming the processing of a batch job from the point of the last checkpoint. Typically, this is done if the batch
job has been interrupted because of a system failure.</p>

<h3><a name="tag_03_65"></a>Batch Server</h3>

<p>A computational entity that provides batch services.</p>

<h3><a name="tag_03_66"></a>Batch Server Name</h3>

<p>A string of characters in the portable character set used to specify a particular server in a network. <basefont size="2"></p>

<dl>
<dt><b>Note:</b></dt>

<dd>The Portable Character Set is defined in detail in <a href="xbd_chap06.html#tag_06_01"><i>Portable Character Set</i></a> .</dd>
</dl>

<basefont size="3"> 

<h3><a name="tag_03_67"></a>Batch Service</h3>

<p>Computational and organizational services performed by a batch system on behalf of batch jobs.</p>

<p>Batch services are of two types: requested and deferred. <basefont size="2"></p>

<dl>
<dt><b>Note:</b></dt>

<dd>Batch Services are listed in the Shell and Utilities volume of IEEE&nbsp;Std&nbsp;1003.1-2001, Table 3-5, Batch Services
Summary.</dd>
</dl>

<basefont size="3"> 

<h3><a name="tag_03_68"></a>Batch Service Request</h3>

<p>A solicitation of services from a batch client to a batch server.</p>

<p>A batch service request may entail the exchange of any number of messages between the batch client and the batch server.</p>

<p>When naming specific types of service requests, the term &quot;request&quot; is qualified by the type of request, as in <i>Queue Batch
Job Request</i> and <i>Delete Batch Job Request</i>.</p>

<h3><a name="tag_03_69"></a>Batch Submission</h3>

<p>The process by which a batch client requests that a batch server create a batch job via a <i>Queue Job Request</i> to perform a
specified computational task.</p>

<h3><a name="tag_03_70"></a>Batch System</h3>

<p>A collection of one or more batch servers.</p>

<h3><a name="tag_03_71"></a>Batch Target User</h3>

<p>The name of a user on the batch destination batch server.</p>

<p>The target user is the user name under whose account the batch job is to execute on the destination batch server.</p>

<h3><a name="tag_03_72"></a>Batch User</h3>

<p>A user who is authorized to make use of batch services.</p>

<h3><a name="tag_03_73"></a>Bind</h3>

<p>The process of assigning a network address to an endpoint.</p>

<h3><a name="tag_03_74"></a>Blank Character (&lt;blank&gt;)</h3>

<p>One of the characters that belong to the <b>blank</b> character class as defined via the <i>LC_CTYPE</i> category in the current
locale. In the POSIX locale, a &lt;blank&gt; is either a &lt;tab&gt; or a &lt;space&gt;.</p>

<h3><a name="tag_03_75"></a>Blank Line</h3>

<p>A line consisting solely of zero or more &lt;blank&gt;s terminated by a &lt;newline&gt;; see also <a href="#tag_03_144">Empty
Line</a> .</p>

<h3><a name="tag_03_76"></a>Blocked Process (or Thread)</h3>

<p>A process (or thread) that is waiting for some condition (other than the availability of a processor) to be satisfied before it
can continue execution.</p>

<h3><a name="tag_03_77"></a>Blocking</h3>

<p>A property of an open file description that causes function calls associated with it to wait for the requested action to be
performed before returning.</p>

<h3><a name="tag_03_78"></a>Block-Mode Terminal</h3>

<p>A terminal device operating in a mode incapable of the character-at-a-time input and output operations described by some of the
standard utilities. <basefont size="2"></p>

<dl>
<dt><b>Note:</b></dt>

<dd>Output Devices and Terminal Types are defined in detail in <a href="xbd_chap10.html#tag_10_02"><i>Output Devices and Terminal
Types</i></a> .</dd>
</dl>

<basefont size="3"> 

<h3><a name="tag_03_79"></a>Block Special File</h3>

<p>A file that refers to a device. A block special file is normally distinguished from a character special file by providing access
to the device in a manner such that the hardware characteristics of the device are not visible.</p>

<h3><a name="tag_03_80"></a>Braces</h3>

<p>The characters <tt>'{'</tt> (left brace) and <tt>'}'</tt> (right brace), also known as curly braces. When used in the phrase
&quot;enclosed in (curly) braces&quot; the symbol <tt>'{'</tt> immediately precedes the object to be enclosed, and <tt>'}'</tt> immediately
follows it. When describing these characters in the portable character set, the names &lt;left-brace&gt; and &lt;right-brace&gt;
are used.</p>

<h3><a name="tag_03_81"></a>Brackets</h3>

<p>The characters <tt>'['</tt> (left-bracket) and <tt>']'</tt> (right-bracket), also known as square brackets. When used in the
phrase &quot;enclosed in (square) brackets&quot; the symbol <tt>'['</tt> immediately precedes the object to be enclosed, and <tt>']'</tt>
immediately follows it. When describing these characters in the portable character set, the names &lt;left-square-bracket&gt; and
&lt;right-square-bracket&gt; are used.</p>

<h3><a name="tag_03_82"></a>Broadcast</h3>

<p>The transfer of data from one endpoint to several endpoints, as described in RFC&nbsp;919 and RFC&nbsp;922.</p>