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.TH pbs_module 7B "20 April 2018" Local "PBS Professional"
.SH NAME
.B pbs_module
\- Python interface to PBS and PBS hook environment


.SH DESCRIPTION
 
The 
.I pbs module 
provides an interface to PBS and the hook environment.
The interface is made up of Python objects, which have attributes and
methods.  You can operate on these objects using Python code.
For a description of each object, see the 
.I PBS Professional Administrator's Guide.

.SH PBS MODULE OBJECTS

.IP  pbs.acl
Represents a PBS ACL type. 
.IP  pbs.args
Represents a space-separated list of PBS arguments to commands like qsub, qdel.
.IP  pbs.argv[]
Represents a list of argument strings to be passed to the program
.IP  pbs.BadAttributeValueError
Raised when setting the attribute value of a pbs.* object to an invalid value.
.IP  pbs.BadAttributeValueTypeError
Raised when setting the attribute value of a pbs.* object to an invalid value type.
.IP  pbs.BadResourceValueError
Raised when setting the resource value of a pbs.* object to an invalid value.
.IP  pbs.BadResourceValueTypeError
Raised when setting the resource value of a pbs.* object to an invalid value type.
.IP  pbs.checkpoint
Represents a job's 
.I Checkpoint 
attribute.
.IP  pbs.depend
Represents a job's 
.I depend
attribute.
.IP  pbs.duration
Represents a time interval.
.IP  pbs.email_list
Represents the set of users to whom mail may be sent.
.IP  pbs.env[]
Dictionary of environment variables.
.IP  pbs.event
Represents a PBS event.
.IP  pbs.EventIncompatibleError
Raised when referencing a non-existent attribute in pbs.event().
.IP  pbs.EXECHOST_PERIODIC
The 
.I exechost_periodic 
event type.
.IP  pbs.EXECHOST_STARTUP
The 
.I exechost_startup
event type.
.IP  pbs.EXECJOB_ATTACH
The 
.I execjob_attach
event type.
.IP  pbs.EXECJOB_BEGIN
The 
.I execjob_begin
event type.
.IP  pbs.EXECJOB_END
The 
.I execjob_end
event type.
.IP  pbs.EXECJOB_EPILOGUE
The 
.I execjob_epilogue
event type.
.IP  pbs.EXECJOB_LAUNCH
The 
.I execjob_launch
event type.
.IP  pbs.EXECJOB_PRETERM
The 
.I execjob_preterm
event type.
.IP  pbs.EXECJOB_PROLOGUE
The 
.I execjob_prologue
event type.
.IP  pbs.exec_host
Represents a job's 
.I exec_host 
attribute.
.IP  pbs.exec_vnode
Represents a job's 
.I exec_vnode 
attribute.
.IP  pbs.group_list
Represents a list of group names.
.IP  pbs.hold_types
Represents a job's 
.I Hold_Types 
attribute.
.IP  pbs.hook_config_filename
Contains path to hook's configuration file.
.IP  pbs.job
Represents a PBS job.
.IP  pbs.job_list[]
Represents a list of pbs.job objects.
.IP  pbs.job_sort_formula
Represents the server's
.I job_sort_formula 
attribute.
.IP  pbs.JOB_STATE_BEGUN
Represents the job array state of having started.
.IP  pbs.JOB_STATE_EXITING
Represents the job state of exiting.
.IP  pbs.JOB_STATE_EXPIRED
Represents the subjob state of expiring.
.IP  pbs.JOB_STATE_FINISHED
Represents the job state of finished.
.IP  pbs.JOB_STATE_HELD
Represents the job state of held.
.IP  pbs.JOB_STATE_MOVED
Represents the job state of moved.
.IP  pbs.JOB_STATE_QUEUED
Represents the job state of queued.
.IP  pbs.JOB_STATE_RUNNING
Represents the job state of running.
.IP  pbs.JOB_STATE_SUSPEND
Represents the job state of suspended.
.IP  pbs.JOB_STATE_SUSPEND_USERACTIVE
Represents the job state of suspended due to user activity.
.IP  pbs.JOB_STATE_TRANSIT
Represents the job state of transiting.
.IP  pbs.JOB_STATE_WAITING
Represents the job state of waiting.
.IP  pbs.join_path
Represents a job's 
.I Join_Path
attribute.
.IP  pbs.keep_files
Represents a job's 
.I Keep_Files 
attribute.
.IP pbs.license_count
Represents a set of licensing-related counters.
.IP  pbs.LOG_DEBUG
Log level 004.
.IP  pbs.LOG_ERROR
Log level 004.
.IP  pbs.LOG_WARNING
Log level 004.
.IP  pbs.mail_points
Represents a job's 
.I Mail_Points 
attribute.
.IP  pbs.MODIFYJOB
The 
.I modifyjob 
event type.
.IP  pbs.MOVEJOB
The 
.I movejob 
event type.

.IP pbs.ND_BUSY
Represents 
.I busy 
vnode state.

.IP pbs.ND_DEFAULT_EXCL
Represents 
.I default_excl sharing 
vnode attribute value

.IP pbs.ND_DEFAULT_SHARED
Represents 
.I default_shared sharing 
vnode attribute value.

.IP pbs.ND_DOWN
Represents 
.I down 
vnode state

.IP pbs.ND_FORCE_EXCL
Represents 
.I force_excl sharing 
vnode attribute value.

.IP pbs.ND_FREE
Represents 
.I free 
vnode state. 

.IP pbs.ND_GLOBUS
PBS no longer supports Globus.  The Globus functionality has been 
.B removed 
from PBS.

Represents
.I globus 
vnode 
.I ntype.

.IP pbs.ND_IGNORE_EXCL
Represents 
.I ignore_excl sharing 
vnode attribute value.

.IP pbs.ND_JOBBUSY
Represents 
.I job-busy 
vnode state.

.IP pbs.ND_JOB_EXCLUSIVE
Represents 
.I job-exclusive 
vnode state.

.IP pbs.ND_OFFLINE
Represents 
.I offline 
vnode state.  

.IP pbs.ND_PBS
Represents 
.I pbs 
vnode 
.I ntype.

.IP pbs.ND_PROV
Represents 
.I provisioning 
vnode state.

.IP pbs.ND_RESV_EXCLUSIVE
Represents
.I resv-exclusive
vnode state.

.IP pbs.ND_STALE
Represents 
.I stale 
vnode state.

.IP pbs.ND_STATE_UNKNOWN
Represents 
.I state-unknown, down 
vnode state.

.IP pbs.ND_UNRESOLVABLE
Represents the 
.I unresolvable
vnode state.

.IP pbs.ND_WAIT_PROV
Represents 
.I wait-provisioning 
vnode state.

.IP  pbs.node_group_key
Represents the server or queue 
.I node_group_key
attribute.
.IP  pbs.path_list
Represents a list of pathnames.
.IP  pbs.pbs_conf[]
Dictionary of entries in pbs.conf.
.IP  pbs.pid
Represents the process ID of a process belonging to a job.

.IP  pbs.place
Represents the 
.I place
job submission specification.
.IP pbs.progname
Path of job shell or executable.
.IP  pbs.QTYPE_EXECUTION
The 
.I execution
queue type.
.IP  pbs.QTYPE_ROUTE
The 
.I route
queue type.
.IP  pbs.queue
Represents a PBS queue.
.IP  pbs.QUEUEJOB
The 
.I queuejob 
event type.
.IP  pbs.range
Represents a range of numbers referring to array indices.
.IP  pbs.resv
Represents a PBS reservation.
.IP  pbs.RESVSUB
The 
.I resvsub
event type.
.IP  pbs.RESV_STATE_BEING_DELETED
Represents the reservation state RESV_BEING_DELETED.
.IP  pbs.RESV_STATE_CONFIRMED
Represents the reservation state RESV_CONFIRMED.
.IP  pbs.RESV_STATE_DEGRADED
Represents the reservation state RESV_DEGRADED.
.IP  pbs.RESV_STATE_DELETED
Represents the reservation state RESV_DELETED.
.IP  pbs.RESV_STATE_DELETING_JOBS
Represents the reservation state RESV_DELETING_JOBS.
.IP  pbs.RESV_STATE_FINISHED
Represents the reservation state RESV_FINISHED.
.IP  pbs.RESV_STATE_NONE
Represents the reservation state RESV_NONE.
.IP  pbs.RESV_STATE_RUNNING
Represents the reservation state RESV_RUNNING.
.IP  pbs.RESV_STATE_TIME_TO_RUN
Represents the reservation state RESV_TIME_TO_RUN.
.IP  pbs.RESV_STATE_UNCONFIRMED
Represents the reservation state RESV_UNCONFIRMED.
.IP  pbs.RESV_STATE_WAIT
Represents the reservation state RESV_WAIT.
.IP  pbs.route_destinations
Represents a queue's 
.I route_destinations
attribute.
.IP  pbs.RUNJOB
The 
.I runjob
event type.
.IP  pbs.select
Represents the 
.I select
job submission specification.
.IP  pbs.server
Represents the local PBS server.
.IP  pbs.size
Represents a PBS 
.I size
type.
.IP  pbs.software
Represents a site-dependent software specification resource.
.IP  pbs.staging_list
Represents a list of file stagein or stageout parameters.
.IP  pbs.state_count
Represents a set of job-related state counters.
.IP  pbs.SV_STATE_ACTIVE
Represents the server state "Scheduling".
.IP  pbs.SV_STATE_HOT
Represents the server state "Hot_Start".
.IP  pbs.SV_STATE_IDLE
Represents the server state "Idle".
.IP  pbs.SV_STATE_SHUTDEL
Represents the server state "Terminating, Delayed".
.IP  pbs.SV_STATE_SHUTIMM
Represents the server state "Terminating".
.IP  pbs.SV_STATE_SHUTSIG
Represents the server state "Terminating", when a signal has been caught.
.IP  pbs.UnsetAttributeNameError
Raised when referencing a non-existent name of a pbs.* object.
.IP  pbs.UnsetResourceNameError
Raised when referencing a non-existent name of a pbs.* object.
.IP  pbs.user_list
Represents a list of user names.
.IP  pbs.vchunk
Represents a resource chunk assigned to a job.
.IP  pbs.version
Represents PBS version information.
.IP  pbs.vnode
Represents a PBS vnode.
.IP  pbs.vnode_list[]
Represents a list of PBS vnodes.
.IP  SystemExit
Raised when accepting or rejecting an action.
.LP

.SH PBS MODULE GLOBAL METHODS
.IP pbs.acl("[+|-]<entity>][,...]")
Creates an object representing a PBS ACL, using the given string parameter.
Instantiation of these objects requires a formatted input string.


.IP pbs.args("<args>")
where 
.I <args> 
are space-separated arguments to a command such as 
.B qsub 
or 
.B qdel.
Creates an object representing the arguments to the command.
Example:
.RS 10
pbs.args("-Wsuppress_email=N -r y")
.RE
.IP
Instantiation of these objects requires a formatted input string.

.IP pbs.checkpoint("<checkpoint_string>")
where 
.I <checkpoint_string> 
must be one of "n", "s", "c", "c=mmm", "w", or "w=mmm"
Creates an object representing the job's
.I Checkpoint 
attribute, using the given string.
Instantiation of these objects requires a formatted input string.
.IP pbs.depend("<depend_string>")
.I <depend_string> 
must be of format "<type>:<jobid>[,<jobid>...]", or "on:<count>", and
where 
.I <type> 
is one of "after", "afterok", "afterany", "before", "beforeok",
and "beforenotok".
Creates a PBS dependency specification object representing the job's
.I depend 
attribute, using the given 
.I <depend_string>.
Instantiation of these objects requires a formatted input string.
.IP pbs.duration("[[hours:]minutes:]seconds[.milliseconds]")
Creates a time specification duration instance, returning the
equivalent number of seconds from the given time string. Represents an
interval or elapsed time in number of seconds. Duration objects can be
specified using either a time or an integer. See the
"pbs.duration(<integer>)" creation method.
.IP pbs.duration(<integer>)
Creates an integer duration instance using the specified number of
seconds.  A 
.I pbs.duration 
instance can be operated on by any of the
Python 
.I int 
functions.  When performing arithmetic operations on a
.I pbs.duration 
type, ensure the resulting value is a 
.I pbs.duration()
type, before assigning to a job member that expects such a type.
.IP pbs.email_list("<email_address1>[,<email_address2>...]")
Creates an object representing a mail list.
Instantiation of these objects requires a formatted input string.
.IP pbs.exec_host("host/N[*C][+...]")
Create an object representing the 
.I exec_host 
job attribute, using the
given host and resource specification.
Instantiation of these objects requires a formatted input string.
.IP pbs.exec_vnode("<vchunk>[+<vchunk>...]")
.I <vchunk> 
is (<vnodename:ncpus=N:mem=M>)
Creates an object representing the 
.I exec_vnode 
job attribute, using the
given vnode and resource specification. When the 
.B qrun -H 
command is used, or when the scheduler runs a job, the 
.I pbs.job.exec_vnode 
object contains the vnode specification for the job.  Instantiation of these
objects requires a formatted input string.
.br
Example:
.br
pbs.exec_vnode("(vnodeA:ncpus=N:mem=X)+(nodeB:ncpus=P:mem=Y+nodeC:mem=Z)")
.br
This object is managed and accessed via the 
.I str() 
or 
.I repr() 
functions. 
.br
Example:
.br
Python> ev = pbs.server().job("10").exec_vnode
.br
Python> str(ev)
.br
"(vnodeA:ncpus=2:mem=200m)+(vnodeB:ncpus=5:mem=1g)"

.IP pbs.get_hook_config_file()
Returns the path to the hook's configuration file, or None if there is
no configuration file.  For example:
.RS 10
configfilepath = pbs.get_hook_config_file()
.RE

.IP pbs.get_local_nodename()
This returns a Python str whose value is the name of the local natural vnode.
If you want to refer to the vnode object representing the current
host, you can pass this vnode name as the key to
.I pbs.event().vnode_list[].  
For example:
.RS 10
Vn = pbs.event().vnode_list[pbs.get_local_nodename()]
.RE

.IP pbs.get_pbs_conf()
This method returns a dictionary of values which represent entries in
the pbs.conf file.  The method reads the file on the host where a hook
runs, so pre-execution event hooks get the entries on the server host,
and execution event hooks get the entries on the execution host where
the hook runs.  The method reads /etc/pbs.conf on the host where
pbs_python runs.
Example:
.RS 10
pbs_conf = pbs.get_pbs_conf()
.br
pbs.logmsg(pbs.LOG_DEBUG, "pbs home is " % (pbs_conf['PBS_HOME]))
.RE
.IP
If you HUP pbs_mom (Linux/UNIX), pbs.get_pbs_conf returns the reloaded
contents of the pbs.conf file.

.IP pbs.group_list("<group_name>[@<host>][,<group_name>[@<host>]...]")
Creates an object representing a PBS group list.
To use a group list object:
.br
pbs.job.group_list = pbs.group_list(....)
.br
Instantiation of these objects requires a formatted input string.
.IP pbs.hold_types("<hold_type_str>")
where 
.I <hold_type_str> 
is one of "u", "o", "s", or "n".
Creates an object representing the 
.I Hold_Types 
job attribute.
Instantiation of these objects requires a formatted input string.
.IP pbs.job_sort_formula("<formula_string>")
where 
.I <formula_string> 
is a string containing a math formula. 
Creates an object representing the 
.I job_sort_formula 
server attribute.
Instantiation of these objects requires a formatted input string.
.IP pbs.join_path({"oe"|"eo"|"n"})
Creates an object representing the 
.I Join_Path 
job attribute.
Instantiation of these objects requires a formatted input string.
.IP pbs.keep_files("<keep_files_str>")
where 
.I <keep_files_str> 
is one of "o", "e", "oe", "eo".
Creates an object representing the 
.I Keep_Files 
job attribute.
Instantiation of these objects requires a formatted input string.
.IP pbs.license_count("Avail_Global:<W>Avail_Local:<X>Used:<Y>High_Use:<Z>")
Instantiates an object representing a 
.I license_count 
attribute.
Instantiation of these objects requires a formatted input string.
.IP pbs.logjobmsg(job_ID,message)
where 
.I job_ID 
must be an existing or previously existing job ID and where 
.I message 
is an arbitrary string.  This puts a custom string in the PBS Server
log. The 
.B tracejob 
command can be used to print out the job-related
messages logged by a hook script.  Messages are logged at log event
class 
.I pbs.LOG_DEBUG.
.IP pbs.logmsg(log_event_class,message)
where 
.I message 
is an arbitrary string, and where 
.I log_event_class 
can be one of the message log event class constants:
.br
pbs.LOG_WARNING
.br
pbs.LOG_ERROR
.br
pbs.LOG_DEBUG
.br
This puts a custom string in the daemon log.
.IP pbs.mail_points("<mail_points_string>")
where 
.I <mail_points_string> 
is "a", "b", and/or "e", or "n".
Creates an object representing a 
.I Mail_Points 
attribute.
Instantiation of these objects requires a formatted input string.
.IP pbs.node_group_key("<resource>")
Creates an object representing the resource to be used for node
grouping, using the specified resource.
.IP pbs.path_list("<path>[@<host>][,<path>@<host>...]")
Creates an object representing a PBS pathname list.
To use a path list object:
.br
pbs.job.Shell_Path_List = pbs.path_list(....)
.br
Instantiation of these objects requires a formatted input string.

.IP pbs.env()
Creates an empty environment variable list.  For example, to create
an empty environment variable list:
.RS 10
pbs.event().env = pbs.pbs_env()
.RE

.IP pbs.place("[arrangement]:[sharing]:[group]")
.I arrangement 
can be "pack", "scatter", "free", "vscatter"
.br
.I sharing 
can be "shared", "excl", "exclhost"
.br
.I group 
can be of the form "group=<resource>"
.br
.I [arrangement], [sharing], 
and 
.I [group] 
can be given in any order or combination.
.br
Creates a place object representing the job's place specification.
Instantiation of these objects requires a formatted input string.
.br
Example:
.br
pl = pbs.place("pack:excl")
.br
s = repr(pl) (or s = `pl`)
.br
letter = pl[0] (assigns 'p' to letter)
.br
s = s + ":group=host" (append to string)
br
pl = pbs.place(s) (update original pl)
.IP pbs.range("<start>-<stop>:<step>")
Creates a PBS object representing a range of values.
.br
Example:
.br
pbs.range("1-30:3")
.br
Instantiation of these objects requires a formatted input string.

.IP pbs.reboot([<command>])
This stops hook execution, so that remaining lines in the hook script
are not executed, and starts the tasks that would normally begin after
the hook is finished, such as flagging the current host to be
rebooted.  The MoM logs show the following:
.RS 10
<hook name> requested for host to be rebooted
.RE
.IP
We recommend that before calling pbs.reboot(), you set any vnodes
managed by this MoM offline, and requeue the current job, if this hook
is not an exechost_periodic hook.  For example:
.RS 10
for  v in pbs.event().vnode_list.keys():
.br
\ \ \ pbs.event().vnode_list[v].state = pbs.ND_OFFLINE
.br
\ \ \ pbs.event().vnode_list[v].comment = "MoM host rebooting"
.br
pbs.event().job.rerun()
.br
pbs.reboot()
.RE
.IP
The effect of the call to pbs.reboot() is not instantaneous. The
reboot happens after the hook executes, and after any of the other
actions such as pbs.event().job.rerun(), pbs.event().delete(), and
pbs.event().vnode_list[] take effect.

A hook with its user attribute set to pbsuser cannot successfully
invoke pbs.reboot(), even if the owner is a PBS Manager or Operator.
If this is attempted, the host is not rebooted, and the following
message appears at log event class PBSEVENT_DEBUG2 in the MoM logs:
.RS 10
<hook_name>; Not allowed to issue reboot if run as user.
.RE
.IP
The <command> is an optional argument.  It is a Python str which is
executed instead of the reboot command that is the default for the
system.  For example:
.RS 10
pbs.reboot("/usr/local/bin/my_reboot -s 10 -c 'going down in 10'")
.RE
.IP
The specified <command> is executed in a shell on Linux/UNIX or via cmd on Windows.


.IP pbs.route_destinations("<queue_spec>[,<queue_spec>,...]")
where 
.I <queue_spec> 
is queue_name[@server_host[:port]]
.br
Creates an object that represents a 
.I route_destinations 
routing queue attribute.
Instantiation of these objects requires a formatted input string.
.IP pbs.select("[N:]res=val[:res=val][+[N:]res=val[:res=val]...]")
Creates a 
.I select 
object representing the job's select specification.
Instantiation of these objects requires a formatted input string.
Example:
.br
sel = pbs.select("2:ncpus=1:mem=5gb+3:ncpus=2:mem=5gb")
.br
s = repr(sel) (or s = `sel`)
.br
letter = s[3] (assigns 'c' to letter)
.br
s = s + "+5:scratch=10gb" (append to string)
.br
sel = pbs.select(s) (reset the value of sel)
.br
.IP pbs.size(<integer>)
Creates a PBS 
.I size 
object using the given integer value, storing the
value as the number of bytes. Size objects can be specified using
either an integer or a string. See the "pbs.size("<integer><suffix>")"
creation method.
.IP pbs.size("<integer><suffix>")
Creates a PBS 
.I size 
object out of the given string specification. 
See the 
.I PBS Professional Reference Guide 
for suffix information.
The size of a word
is the word size on the execution host. 
.I Size 
objects can be specified
using either an integer or a string.  To operate on 
.I pbs.size
instances, use the "+" and "-" operators.  To compare 
.I pbs.size
instances, use the "==", "!=", ">", "<", ">=", and "<=" operators.
Example: the sizes are normalized to the smaller of the 2 suffixes. In
this case, "10gb" becomes "10240mb" and is added to "10mb":
.br
sz = pbs.size("10gb")
.br
sz = sz + 10mb
.br
10250mb
.br
Example: the following returns 
.I True 
because 
.I sz 
is greater than 100 bytes:
.br
if sz > 100:
.br
\ \ \ \ gt100 = True
.br

.IP pbs.software("<software_info_string>")
Creates an object representing a site-dependent software resource.
Instantiation of these objects requires a formatted input string.

.IP pbs.staging_list("<filespec>[,<filespec>,...]")
where 
.I <filespec> 
is <execution_path>@<storage_host>:<storage_path>
Creates an object representing a job file staging parameters list.
To use a staging list object:
.br
pbs.job.stagein = pbs.staging_list(....)
.br
Instantiation of these objects requires a formatted input string.
.IP pbs.state_count("Transit:<U>Queued:<V>Held:<W>Running:<X>Exiting:<Y>Begun:<Z>)
Instantiates an object representing a 
.I state_count 
attribute.
Instantiation of these objects requires a formatted input string.
.IP pbs.user_list("<user>[@<host>][,<user>@<host>...]")
Creates an object representing a PBS user list.
To use a user list object:
.br
pbs.job.User_List = pbs.user_list(....)
.br
Instantiation of these objects requires a formatted input string.

.IP pbs.version("<pbs_version_string>")
Creates an object representing the PBS version string.
Instantiation of these objects requires a formatted input string.



.SH ATTRIBUTES AND RESOURCES
.br
Hooks can read Server, Queue, or reservation resources. 
Hooks can read vnode or job attributes and resources.  Hooks can modify
.IP
The resources requested by a job
.br
The resources used by a job
.br
The attributes of a job
.br
The resource arguments to pbs_rsub
.br
Vnode attributes and resources
.br
The shell or program to be executed in a job
.br 
The arguments to the shell or program to be executed in a job
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The environment of the job
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Custom and built-in PBS resources are represented in Python dictionaries,
where the resource names are the dictionary keys.  Built-in resources are
listed in pbs_resources(7B).  You reference a resource through a vnode,
the Server, the event that triggered the hook, or the current job, for example:

.IP
pbs.server().resources_available["< resource name>"]
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pbs.event().job.Resource_List["< resource name>"]
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pbs.event().vnode_list[<vnode name>].resources_available["< resource name >"]
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The resource name must be in quotes.
Example: Get the number of CPUs:

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ncpus = Resource_List["ncpus"]
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An instance R of a job resource can be set as follows:
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R["<resource name>"] = <resource value>
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For example:
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pbs.event().job().Resource_List["mem"] = 8gb
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.SH EXCEPTIONS

.IP  pbs.BadAttributeValueError
Raised when setting the attribute value of a pbs.* object to an invalid value.
.IP  pbs.BadAttributeValueTypeError
Raised when setting the attribute value of a pbs.* object to an invalid value type.
.IP  pbs.BadResourceValueError
Raised when setting the resource value of a pbs.* object to an invalid value.
.IP  pbs.BadResourceValueTypeError
Raised when setting the resource value of a pbs.* object to an invalid value type.
.IP  pbs.EventIncompatibleError
Raised when referencing a non-existent attribute in pbs.event().
.IP  pbs.UnsetAttributeNameError
Raised when referencing a non-existent name of an attribute.
.IP  pbs.UnsetResourceNameError
Raised when referencing a non-existent name of a resource.
.IP  SystemExit
Raised when accepting or rejecting an action.
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If a hook encounters an unhandled exception:
.IP
PBS rejects the corresponding action, and an error message is printed 
to stderr.
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A message is printed to the daemon log.
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.SH SEE ALSO
The
.I PBS Professional Administrator's Guide,
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pbs_hook_attributes(7B), pbs_resources(7B),
qmgr(1B)