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Full Discussion: Need help to get the parsed output of "iostat" command
Top Forums Shell Programming and Scripting Need help to get the parsed output of "iostat" command Post 302974461 by gopivallabha on Tuesday 31st of May 2016 12:20:16 AM
Old 05-31-2016
Need help to get the parsed output of "iostat" command
Hi,

I have a requirement where parsed output from various linux commands like top, netstat, iostat, etc. will be the input for one javascript with the parsed output from these commands converted to JSON format

For "iostat" command, since there are two outputs - one w.r.t CPU utilization and another w.r.t device statistics, ex.:
Code:
iostat -c
[root@rhel64 ~]# iostat -c
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           0.59    0.00    0.32    0.46    0.00   98.63

and

Code:
iostat -d -p
[root@rhel64 ~]# iostat -d -p -k
Device:            tps    kB_read/s    kB_wrtn/s    kB_read    kB_wrtn
scd0              0.00         0.00         0.00        180          0
sda               1.21         1.00        22.27    1521773   33955953
sda1              0.00         0.01         0.00      10487          9
sda2              1.21         0.99        22.27    1510670   33955944
dm-0              5.60         0.99        22.27    1508485   33949224
dm-1              0.00         0.00         0.00       1288       6708
dm-2              0.00         0.00         0.00        489         12


My requirement here is to have a shell script or perl script which can awk the output for the above two usages of iostat command (i.e., for CPU and device statistics) but without any sampling interval taken into account (sampling interval will be done later by calling the code multiple time. For now, output displayed once is enough)
There should be two parsed outputs, one for CPU statistics and one for Device statistics both of which shall later be used as input data for conversion to JSON format (in node.js)

Can someone help me out here?
Last edited by Don Cragun; 05-31-2016 at 02:03 AM.. Reason: Add CODE and ICODE tags.
 

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LEARN ABOUT ULTRIX

iostat

iostat(1)						      General Commands Manual							 iostat(1)

Name
       iostat - report I/O statistics

Syntax
       iostat [ -c ] [ -t ] [ disknames ] [ interval ] [ count ]

Description
       The  command  reports  I/O  statistics for terminals, disks and cpus.  For terminals the number of input and output characters are counted.
       For disks the number of 512 byte blocks per second and number of transfers per second are displayed.  For cpus, it provides the	percentage
       of  time  the system has spent in user mode, in user mode running low priority (niced) processes, in system mode, and idling.  On multipro-
       cessor systems these cpu statistics represent a cumulative summary of all the cpus.

       The optional disknames argument causes disk statistics to be displayed for the specified disks.	If this argument  is  not  specified  then
       disk statistics will be displayed for the first 3 disks only.

       The  optional interval argument causes to report once each interval seconds.  The first report is for all time since a reboot and each sub-
       sequent report is for the last interval only.

       The optional count argument restricts the number of reports.

Options
       -c   Displays the percentage of time each cpu spent in user mode, running low priority (nice'd) processes, in system mode, and idling.

       -t   Displays the number of characters read from and written to terminals.

Examples
       This example will cause cpu and disk statistics for the 5 disks ra0, ra1, ra2, ra3, and ra4.
	    iostat ra0 ra1 ra2 ra3 ra4
       This example will cause cpu, terminal, and disk statistics for ra0 to be displayed and updated every 2 seconds.
	    iostat -t ra0 2

Files
See Also
       vmstat(1), cpustat(1)

																	 iostat(1)
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