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Test Your Knowledge in Computers #555
Difficulty: Easy
In C, if double b = 3.14159265359; printf("b=%10f ", b); then the output with be b=3.141593
True or False?
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rrdxport(1) [suse man page]

RRDXPORT(1)							      rrdtool							       RRDXPORT(1)

rrdxport - Export data in XML format based on data from one or several RRD SYNOPSIS
rrdtool xport [-s|--start seconds] [-e|--end seconds] [-m|--maxrows rows] [--step value] [--daemon address] [DEF:vname=rrd:ds-name:CF] [CDEF:vname=rpn-expression] [XPORT:vname[:legend]] DESCRIPTION
The xport function's main purpose is to write an XML formatted representation of the data stored in one or several RRDs. It can also extract numerical reports. If no XPORT statements are found, there will be no output. -s|--start seconds (default end-1day) The time when the exported range should begin. Time in seconds since epoch (1970-01-01) is required. Negative numbers are relative to the current time. By default one day worth of data will be printed. See also AT-STYLE TIME SPECIFICATION section in the rrdfetch documentation for a detailed explanation on how to specify time. -e|--end seconds (default now) The time when the exported range should end. Time in seconds since epoch. See also AT-STYLE TIME SPECIFICATION section in the rrdfetch documentation for a detailed explanation of ways to specify time. -m|--maxrows rows (default 400 rows) This works like the -w|--width parameter of rrdgraph. In fact it is exactly the same, but the parameter was renamed to describe its purpose in this module. See rrdgraph documentation for details. --step value (default automatic) See rrdgraph documentation. --daemon address Address of the rrdcached daemon. If specified, a "flush" command is sent to the server before reading the RRD files. This allows rrdtool to return fresh data even if the daemon is configured to cache values for a long time. For a list of accepted formats, see the -l option in the rrdcached manual. rrdtool xport --daemon unix:/var/run/rrdcached.sock ... --enumds The generated xml should contain the data values in enumerated tags. <v0>val</v0><v1>val</v1> DEF:vname=rrd:ds-name:CF See rrdgraph documentation. CDEF:vname=rpn-expression See rrdgraph documentation. XPORT:vname::legend At least one XPORT statement should be present. The values referenced by vname are printed. Optionally add a legend. Output format The output is enclosed in an xport element and contains two blocks. The first block is enclosed by a meta element and contains some meta data. The second block is enclosed by a data element and contains the data rows. Let's assume that the xport command looks like this: rrdtool xport --start now-1h --end now DEF:xx=host-inout.lo.rrd:output:AVERAGE DEF:yy=host-inout.lo.rrd:input:AVERAGE CDEF:aa=xx,yy,+,8,* XPORT:xx:"out bytes" XPORT:aa:"in and out bits" The resulting meta data section is (the values will depend on the RRD characteristics): <meta> <start>1020611700</start> <step>300</step> <end>1020615600</end> <rows>14</rows> <columns>2</columns> <legend> <entry>out bytes</entry> <entry>in and out bits</entry> </legend> </meta> The resulting data section is: <data> <row><t>1020611700</t><v>3.4000000000e+00</v><v>5.4400000000e+01</v></row> <row><t>1020612000</t><v>3.4000000000e+00</v><v>5.4400000000e+01</v></row> <row><t>1020612300</t><v>3.4000000000e+00</v><v>5.4400000000e+01</v></row> <row><t>1020612600</t><v>3.4113333333e+00</v><v>5.4581333333e+01</v></row> <row><t>1020612900</t><v>3.4000000000e+00</v><v>5.4400000000e+01</v></row> <row><t>1020613200</t><v>3.4000000000e+00</v><v>5.4400000000e+01</v></row> <row><t>1020613500</t><v>3.4000000000e+00</v><v>5.4400000000e+01</v></row> <row><t>1020613800</t><v>3.4000000000e+00</v><v>5.4400000000e+01</v></row> <row><t>1020614100</t><v>3.4000000000e+00</v><v>5.4400000000e+01</v></row> <row><t>1020614400</t><v>3.4000000000e+00</v><v>5.4400000000e+01</v></row> <row><t>1020614700</t><v>3.7333333333e+00</v><v>5.9733333333e+01</v></row> <row><t>1020615000</t><v>3.4000000000e+00</v><v>5.4400000000e+01</v></row> <row><t>1020615300</t><v>3.4000000000e+00</v><v>5.4400000000e+01</v></row> <row><t>1020615600</t><v>NaN</v><v>NaN</v></row> </data> EXAMPLE 1 rrdtool xport DEF:out=if1-inouts.rrd:outoctets:AVERAGE XPORT:out:"out bytes" EXAMPLE 2 rrdtool xport DEF:out1=if1-inouts.rrd:outoctets:AVERAGE DEF:out2=if2-inouts.rrd:outoctets:AVERAGE CDEF:sum=out1,out2,+ XPORT:out1:"if1 out bytes" XPORT:out2:"if2 out bytes" XPORT:sum:"output sum" ENVIRONMENT VARIABLES
The following environment variables may be used to change the behavior of "rrdtool xport": RRDCACHED_ADDRESS If this environment variable is set it will have the same effect as specifying the "--daemon" option on the command line. If both are present, the command line argument takes precedence. AUTHOR
Tobias Oetiker <> 1.4.3 2008-09-25 RRDXPORT(1)

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