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z/OS V1R9.0 UNIX System Services Command ... - Christian Grothoff

z/OS V1R9.0 UNIX System Services Command ... - Christian Grothoff

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includes a uname extended header record for each file whose user name<br />

cannot be represented entirely with the letters and digits of the portable<br />

character set.<br />

If the field is zero length, it shall delete any header block field, previously<br />

entered extended header value, or global extended header value of the same<br />

name.<br />

If a keyword in an extended header record (or in a -o option-argument) overrides or<br />

deletes a corresponding field in the USTAR header block, pax shall ignore the<br />

contents of that header block field.<br />

Unlike the USTAR header block fields, NULLs shall not delimit s; all<br />

characters within the field shall be considered data for the field. None of<br />

the length limitations of the USTAR header block fields in USTAR Header Block<br />

shall apply to the extended header records.<br />

queuedefs — Queue description for at, batch, and cron<br />

Description<br />

Examples<br />

The queudefs file describes the characteristics of the queues managed by the<br />

clock daemon cron. Each line in the file that is not a comment uses the following<br />

format to describe a queue:<br />

q . [njobj] [nicen] [nwaitw]<br />

where the fields are:<br />

q Specifies the name of the queue. Jobs started by at default to queue a;<br />

jobs started by batch default to queue b, and crontab files default to queue<br />

c. Queue names can be any singlebyte character except a space, tab,<br />

newline, null, or number sign (#).<br />

njob Specifies the maximum number of jobs that can be run in the queue<br />

simultaneously. If more than njob jobs are ready to run, cron runs the first<br />

njob jobs immediately, and runs the others as current jobs terminate. The<br />

default value is 100.<br />

nice Specifies the nice value (see nice) that cron assigns to all jobs in the<br />

queue that are not run by a user ID with appropriate privileges. The default<br />

value is 2.<br />

nwait Specifies the number of seconds that cron is to wait before it reschedules a<br />

job that was deferred because there were more than njob jobs running in<br />

that job’s queue, or because more than 25 jobs were running in all queues.<br />

The default value is 60.<br />

Lines beginning with a number sign (#) are comments, and are ignored.<br />

Here is a sample queudefs file:.<br />

#<br />

# Sample queuedefs file<br />

#<br />

a.5j3n<br />

b.3j1n90w<br />

pax<br />

Appendix H. File Formats 921

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