04-26-2002
Email alert script
I need to code a script, which will run via cron, every 30 minutes.
The script will read a file containing a date&time and number (which represents disk space). The file gets appended to every 30 minutes. Here's a sample of the file:
CPU 1:04/25/02 1:00 am:1972554
CPU 1:04/25/02 1:30 am:1960223
CPU 1:04/25/02 2:00 pm:1953990
If that value falls below 1000000, I wish to send a email alert to about 3 users that says something like:
"04/25/02 2:00 pm: Check disk space on CPU 1"
Thanks
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clock(3C) clock(3C)
NAME
clock() - report CPU time used
SYNOPSIS
DESCRIPTION
returns the amount of CPU time (in microseconds) used since the first call to The time reported is the sum of the user and system times of
the calling process and its terminated child processes for which it has executed , or (see wait(2) , system(3S), and popen(3S)). To deter-
mine the time in seconds, the value returned by should be divided by the value of the macro
The resolution of the clock varies, depending on the hardware and on software configuration.
If the processor time used is not available or its value cannot be represented, the function returns the value
WARNINGS
The value returned by is defined in microseconds for compatibility with systems that have CPU clocks with much higher resolution. Because
of this, the value returned wraps around after accumulating only 4295 seconds of CPU time (about 72 minutes).
DEPENDENCIES
The default clock resolution is 10 milliseconds.
SEE ALSO
times(2), wait(2), system(3S), thread_safety(5).
STANDARDS CONFORMANCE
clock(3C)