The new implementation of 'lpc topq' is intended to be upwardly compatible

with the previous implementation.  One noticeable difference is the order
in which messages are printed.  In the previous implementation, the
command "lpc topq lp 1 20 300" might print:

lp:
    moved cfA300some.host.org
    moved cfA020some.host.org
    moved cfA001some.host.org

while in the new implementation you'll see:

lp:
    moved cfA001some.host.org
    moved cfA020some.host.org
    moved cfA300some.host.org

The final order of jobs in the queue is exactly the same, it's just
that the jobs are now moved in the same order they were specified,
instead of being moved (and thus listed) in the reverse order.

The new implementation also supports more options for how to select
which jobs should be moved.  The previous topq allowed the user to
select jobs based on a job number, or based on a userid:
    topq lp 17
    topq lp drosehn

The new one also allows for a range of job numbers, or a hostname
(matching jobs that were sent from that hostname).  To specify a
hostname, you must prefix it with an '@'-sign:
    topq lp 17
    topq lp 15-25
    topq lp drosehn
    topq lp @some.host.com

or a combination of those things:
    topq lp drosehn:17
    topq lp 15-25:drosehn
    topq lp 15-25@some.host.edu
    topq lp gad:15-25@some.host.edu

Futhermore, in the new implementation the user can also use
filename-style pattern-matching on the userid or hostname fields:
    topq lp dros[ie]hn
    topq lp @samba*
    topq lp gad@*freebsd.org

(although the user should probably include those in quotes when they
are specifying the topq command as part of the 'lpc' command, just
to make sure the pattern-matching characters are not expanded by
whatever shell they are typing the command into)

The operator can still specify several of these job-specifiers in a
single command:
   topq lp 17 22 27 drosihn:23 gad@*freebsd.org 97

If a job is matched by multiple job-specifiers on a single command,
then its final position in the queue is based on the first job-specifer
which matched it.

The previous implementation also recognized a jobnumber followed by
a hostname (with no separator), or a hostname:jobnumber, although
neither of these options were documented.  Eg:
    topq lp 42some.host.org
    topq lp some.host.org:42

The new version allows the first one, and will also recognize the
second one *iff* the hostname includes a period (otherwise it is
assumed to be a userid followed by a job number).  Both remain
undocumented, and are only provided in case there were some users
who did know about those options, and are used to typing them in.

The new implementation also fixes a few subtle security issues in
the old one (mainly just making sure all error-messages are printed
while the process is "not-priv"), avoids integer-overflow issues on
bad user input, and prints out more descriptive messages in a number
of circumstances.

The new bottomq command accepts all the same arguments as topq, but
moves the selected jobs to the bottom of the queue instead of the top.

This commit is contained in:

Garance A Drosehn

2002-07-17 00:52:06 +00:00

parent dd8faa9ff2

commit 21a392ac13

The new implementation of 'lpc topq' is intended to be upwardly compatible

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