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Top Forums Shell Programming and Scripting Script that will look the same as Cron Post 303037794 by Chubler_XL on Tuesday 13th of August 2019 02:02:07 PM
Old 08-13-2019
Quote:
Originally Posted by meister29
thank you very much sir. i will take note of that. from here i will create my own. thx thx..
Be a little careful how you schedule jobs with this concept, as only one job will run at a time and if another job is due and a long running job hasn't finished yet the other job will not be run. Also if the machine is restarted or you script is killed then the jobs will not be run.

Cron is still your preferred option hear, as all these sort of issues, and others we haven't thought of yet, are dealt with out of the box.
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cron(8) 						      System Manager's Manual							   cron(8)

NAME
cron - The system clock daemon SYNOPSIS
/usr/sbin/cron DESCRIPTION
The cron daemon runs shell commands at specified dates and times. Commands that are to run according to a regular or periodic schedule are found within the crontab files. Commands that are to run once only are found within the at files. You submit crontab and at file entries by using the crontab and at commands. Because the cron process exits only when killed or when the system stops, only one cron daemon should exist on the system at any given time. Normally, you start the cron daemon from within a run command file. During process initialization and when cron detects a change, it examines the crontab and at files. This strategy reduces the overhead of checking for new or changed files at regularly scheduled intervals. The cron command creates a log of its activities. The cron daemon must be started from the system startup scripts because it must begin execution without a login user ID set. The cron daemon starts each job with the following process attributes stored with the job by the invoking process: Login user ID Effective and real user IDs Effective and real group IDs Supplementary groups It also establishes the following attributes from the authentication profile of the account associated with the login user ID of the invok- ing process: Audit control and disposition masks Kernel authorizations DIAGNOSTICS
The at and batch programs will refuse to accept jobs submitted from processes whose login user ID is different from the real user ID. FILES
Specifies the command path. Main cron directory Directory containing the crontab files. List of allowed users. List of denied users His- tory information for cron Queue description file for at, batch, and cron RELATED INFORMATION
Commands: at(1), crontab(1), rc0(8), rc2(8), rc3(8) Files: queuedefs(4) delim off cron(8)
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