RRDTool Command:

/usr/bin/rrdtool graph - \
--imgformat=PNG \
--start=-86400 \
--end=-300 \
--title="foobar - Traffic" \
--rigid \
--base=1000 \
--height=120 \
--width=600 \
--alt-autoscale \
--vertical-label="bits per second" \
--slope-mode \
--font TITLE:12: \
--font AXIS:8: \
--font LEGEND:10: \
--font UNIT:8: \
CDEF:cdefa=a,8,* \
CDEF:cdefe=a,8,* \
CDEF:cdeff=a,8,*,-1,* \
CDEF:cdefg=a,8,* \
CDEF:cdefj=a,8,*,-1,* \
AREA:cdefa#00FF0099:"Inbound"  \
GPRINT:cdefa:LAST:"   Current\:%8.2lf %s"  \
GPRINT:cdefa:AVERAGE:"Average\:%8.2lf %s"  \
GPRINT:cdefa:MAX:"Maximum\:%8.2lf %s"  \
LINE1:cdefe#005D57FF:"Peak Usage\n"  \
AREA:cdeff#00A0FF99:"Outbound"  \
GPRINT:cdefg:LAST:"  Current\:%8.2lf %s"  \
GPRINT:cdefg:AVERAGE:"Average\:%8.2lf %s"  \
GPRINT:cdefg:MAX:"Maximum\:%8.2lf %s"  \
LINE1:cdefj#0000AAFF:"Peak Usage\n"

RRDTool Says:

ERROR: invalid rpn expression in: a,8,*


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