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UNIX for Dummies Questions & Answers
complete unix noob (sorry)
Post 302152941 by Blastman on Saturday 22nd of December 2007 11:00:05 AM
12-22-2007
complete unix noob (sorry)
This is my first time in this forum so, Hello to all!!!
I have been supporting windows based machines for a few years now and I have been writing batch files to do certain tasks for what seems like an age.
I've recently started a new job (as it support) and my new colleagues have said, "forget dos/batch, learn shell scripting instead. It's much more useful"
after watching one of them write some simple code to sort some files, I've decided I'd like to get in to this more.
After having spent most of yesterday and today on the internet I'm left feeling somewhat confused...
Could someone please explain to me the different terms that keep cropping up. like Unix, Linux, Sun, Perl, bash...
also, I'd like to run a virtual machine that I could use at home. What is the OS called (Unix??) if so are there serval different types? whats the most recent? where could i get a copy from and how much?
I know there's alot of questions in this but I'm hoping that you guys will be able to help.
cheers.
I have been supporting windows based machines for a few years now and I have been writing batch files to do certain tasks for what seems like an age.
I've recently started a new job (as it support) and my new colleagues have said, "forget dos/batch, learn shell scripting instead. It's much more useful"
after watching one of them write some simple code to sort some files, I've decided I'd like to get in to this more.
After having spent most of yesterday and today on the internet I'm left feeling somewhat confused...
Could someone please explain to me the different terms that keep cropping up. like Unix, Linux, Sun, Perl, bash...
also, I'd like to run a virtual machine that I could use at home. What is the OS called (Unix??) if so are there serval different types? whats the most recent? where could i get a copy from and how much?
I know there's alot of questions in this but I'm hoping that you guys will be able to help.
cheers.
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LEARN ABOUT POSIX
queuedefs
queuedefs(4) File Formats queuedefs(4) NAME
queuedefs - queue description file for at, batch, and cron SYNOPSIS
/etc/cron.d/queuedefs DESCRIPTION
The queuedefs file describes the characteristics of the queues managed by cron(1M). Each non-comment line in this file describes one queue. The format of the lines are as follows: q.[njobj][nicen][nwaitw] The fields in this line are: q The name of the queue. a is the default queue for jobs started by at(1); b is the default queue for jobs started by batch (see at(1)); c is the default queue for jobs run from a crontab(1) file. njob The maximum number of jobs that can be run simultaneously in that queue; if more than njob jobs are ready to run, only the first njob jobs will be run, and the others will be run as jobs that are currently running terminate. The default value is 100. nice The nice(1) value to give to all jobs in that queue that are not run with a user ID of super-user. The default value is 2. nwait The number of seconds to wait before rescheduling a job that was deferred because more than njob jobs were running in that job's queue, or because the system-wide limit of jobs executing has been reached. The default value is 60. Lines beginning with # are comments, and are ignored. EXAMPLES
Example 1: A sample file. # # a.4j1n b.2j2n90w This file specifies that the a queue, for at jobs, can have up to 4 jobs running simultaneously; those jobs will be run with a nice value of 1. As no nwait value was given, if a job cannot be run because too many other jobs are running cron will wait 60 seconds before trying again to run it. The b queue, for batch(1) jobs, can have up to 2 jobs running simultaneously; those jobs will be run with a nice(1) value of 2. If a job cannot be run because too many other jobs are running, cron(1M) will wait 90 seconds before trying again to run it. All other queues can have up to 100 jobs running simultaneously; they will be run with a nice value of 2, and if a job cannot be run because too many other jobs are running cron will wait 60 seconds before trying again to run it. FILES
/etc/cron.d/queuedefs queue description file for at, batch, and cron. SEE ALSO
at(1), crontab(1), nice(1), cron(1M) SunOS 5.10 1 Mar 1994 queuedefs(4)