shell script to alert cpu memory and disk usage help please

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LEARN ABOUT CENTOS

systemd-cgtop

SYSTEMD-CGTOP(1)						   systemd-cgtop						  SYSTEMD-CGTOP(1)

NAME

       systemd-cgtop - Show top control groups by their resource usage

SYNOPSIS

       systemd-cgtop [OPTIONS...]

DESCRIPTION

       systemd-cgtop shows the top control groups of the local Linux control group hierarchy, ordered by their CPU, memory, or disk I/O load. The
       display is refreshed in regular intervals (by default every 1s), similar in style to top(1). If systemd-cgtop is not connected to a tty,
       only one iteration is performed and no columns headers are printed. This mode is suitable for scripting.

       Resource usage is only accounted for control groups in the relevant hierarchy, i.e. CPU usage is only accounted for control groups in the
       "cpuacct" hierarchy, memory usage only for those in "memory" and disk I/O usage for those in "blkio". If resource monitoring for these
       resources is required, it is recommended to add the CPUAccounting=1, MemoryAccounting=1 and BlockIOAccounting=1 settings in the unit files
       in question (See systemd.resource-control(5) for details).

       To emphasize this: unless "CPUAccounting=1", "MemoryAccounting=1" and "BlockIOAccounting=1" are enabled for the services in question no
       resource accounting will be available for system services and the data shown by systemd-cgtop will be incomplete.

OPTIONS

       The following options are understood:

       -h, --help
	   Prints a short help text and exits.

       --version
	   Prints a version string and exits.

       -p
	   Order by control group path name.

       -t
	   Order by number of tasks in control group (i.e. threads and processes).

       -c
	   Order by CPU load.

       -m
	   Order by memory usage.

       -i
	   Order by disk I/O load.

       -b, --batch
	   Run in "batch" mode: do not accept input and run until the iteration limit set with --iterations is exhausted or until killed. This
	   mode could be useful for sending output from systemd-cgtop to other programs or to a file.

       -n, --iterations=
	   Perform only this many iterations.

       -d, --delay=
	   Specify refresh delay in seconds (or if one of "ms", "us", "min" is specified as unit in this time unit).

       --depth=
	   Maximum control group tree traversal depth. Specifies how deep systemd-cgtop shall traverse the control group hierarchies. If 0 is
	   specified, only the root group is monitored. For 1, only the first level of control groups is monitored, and so on. Defaults to 3.

KEYS

       systemd-cgtop is an interactive tool and may be controlled via user input using the following keys:

       h
	   Shows a short help text.

       SPACE
	   Immediately refresh output.

       q
	   Terminate the program.

       p, t, c, m, i
	   Sort the control groups by path, number of tasks, CPU load, memory usage, or IO load, respectively.

       %
	   Toggle between showing CPU time as time or percentage.

       +, -
	   Increase or decrease refresh delay, respectively.

EXIT STATUS

       On success, 0 is returned, a non-zero failure code otherwise.

SEE ALSO

       systemd(1), systemctl(1), systemd-cgls(1), systemd.resource-control(5), top(1)

systemd 208															  SYSTEMD-CGTOP(1)

Shell Programming and Scripting