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Shell Programming and Scripting
Help with time comparison shell script for HP-UX
Post 86011 by gummysweets on Monday 10th of October 2005 06:08:10 AM
10-10-2005
Help with time comparison shell script for HP-UX
I am using Korne Shell in HP-Ux. Can someone give me and idea on how I can write a shellscript on how to do this please:-
On our HP-UX server, a batch file is run every evening at about 6:30pm. The first step of this batch file will touch an empty "flag" file to indicate that the batch has already started running. This flag is removed at the end of the evening batch file. So bascially, as long as this flag exists, the batch file is not allowed to be run by another operator. The problem is I need to built in some testing that if the batch file has already been run once within the 24 hours cycle, it mustn't be run again.
I thought about setting a timestamp into the "flag" file I create at the beginning of the batch run and call it "BatchRunning". Then rename this flag file and call it "batchRan" so it will be served as sort of time marker for comparison later. So if the batch file is re-run then a comparison can be made between the two files "BatchRunning" and "batchRan". If "BatchRunning" is less than "batchRan" by 24 hours then abort the batch file immedately and display a message to the operator.
So that's the theory, how do I script this in Korne Shell please??
Please help me ... as I have tried to search the forum for clues .... and I am really stuck now..
In my search, on time comparison, it picked up the "datecalc" script but I am not sure if it can be applied to my problem ( it looks far too complicated).
Many thanks in advance,
On our HP-UX server, a batch file is run every evening at about 6:30pm. The first step of this batch file will touch an empty "flag" file to indicate that the batch has already started running. This flag is removed at the end of the evening batch file. So bascially, as long as this flag exists, the batch file is not allowed to be run by another operator. The problem is I need to built in some testing that if the batch file has already been run once within the 24 hours cycle, it mustn't be run again.
I thought about setting a timestamp into the "flag" file I create at the beginning of the batch run and call it "BatchRunning". Then rename this flag file and call it "batchRan" so it will be served as sort of time marker for comparison later. So if the batch file is re-run then a comparison can be made between the two files "BatchRunning" and "batchRan". If "BatchRunning" is less than "batchRan" by 24 hours then abort the batch file immedately and display a message to the operator.
So that's the theory, how do I script this in Korne Shell please??
Please help me ... as I have tried to search the forum for clues .... and I am really stuck now..
In my search, on time comparison, it picked up the "datecalc" script but I am not sure if it can be applied to my problem ( it looks far too complicated).Many thanks in advance,
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LEARN ABOUT SUNOS
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)