This is an old post but the issue seems to still be present. Here's my change to the xLinux part of the script. I hope it helps someone.
if [ "x$KERNEL" = "xLinux" ] ; then
if [ -f /etc/redhat-release ] ; then
if grep -q 7 /etc/redhat-release ; then
#This is RedHat or CentOS 7
assertHaveCommand ifconfig
assertHaveCommand dmesg
CMD_LIST_INTERFACES="eval ifconfig | tee $TEE_DEST | grep flags | grep -Ev lo | tee -a $TEE_DEST | cut -d':' -f1 | tee -a $TEE_DEST"
CMD='ifconfig'
GET_MAC='{if ($0 ~ /ether /) { mac = $2 }}'
GET_IPv4='{if ($0 ~ /inet /) {split($2, a, " "); IPv4 = a[1]}}'
GET_IPv6='{if ($0 ~ /inet6 /) { IPv6 = $2 }}'
GET_COLLISIONS='{if ($0 ~ /collisions /) { collisions = $11 }}'
GET_RXbytes='{if ($0 ~ /RX packets /) { RXbytes = $5 }}'
GET_RXerrors='{if ($0 ~ /RX errors /) {RXerrors = $3}}'
GET_TXbytes='{if ($0 ~ /TX packets /) { TXbytes = $5 }}'
GET_TXerrors='{if ($0 ~ /TX errors /) {TXerrors= $3}}'
GET_ALL="$GET_MAC $GET_IPv4 $GET_IPv6 $GET_COLLISIONS $GET_RXbytes $GET_RXerrors $GET_TXbytes $GET_TXerrors"
FILL_BLANKS='{length(speed) || speed = "<n/a>"; length(duplex) || duplex = "<n/a>"; length(IPv4) || IPv4 = "<n/a>"; length(IPv6) || IPv6= "<n/a>"}'
BEGIN='BEGIN {RXbytes = TXbytes = collisions = 0}'
echo "$HEADER"
for iface in `$CMD_LIST_INTERFACES`
do
# ethtool(8) would be preferred, but requires root privs; so we use dmesg(8), whose [a] source can be cleared, and [b] output format varies (so we have less confidence in parsing)
SPEED=`ethtool $iface | grep Speed: | sed -e 's/^[ \t]*//' | tr -s ' ' | cut -d' ' -f2`
DUPLEX=`ethtool $iface | grep Duplex: | sed -e 's/^[ \t]*//' | tr -s ' ' | cut -d' ' -f2`
$CMD $iface | tee -a $TEE_DEST | awk "$BEGIN $GET_ALL $FILL_BLANKS $PRINTF" name=$iface speed=$SPEED duplex=$DUPLEX
echo "Cmd = [$CMD $iface]; | awk '$BEGIN $GET_ALL $FILL_BLANKS $PRINTF' name=$iface speed=$SPEED duplex=$DUPLEX" >> $TEE_DEST
done
fi
else
#This is everything but RedHat or CentOS 7
assertHaveCommand ifconfig
assertHaveCommand dmesg
CMD_LIST_INTERFACES="eval ifconfig | tee $TEE_DEST | grep 'Link encap:Ethernet' | tee -a $TEE_DEST | cut -d' ' -f1 | tee -a $TEE_DEST"
CMD='ifconfig'
GET_MAC='{NR == 1 && mac = $5}'
GET_IPv4='{if ($0 ~ /inet addr:/) {split($2, a, ":"); IPv4 = a[2]}}'
GET_IPv6='{$0 ~ /inet6 addr:/ && IPv6 = $3}'
GET_COLLISIONS='{if ($0 ~ /collisions:/) {split($1, a, ":"); collisions = a[2]}}'
GET_RXbytes='{if ($0 ~ /RX bytes:/) {split($2, a, ":"); RXbytes= a[2]}}'
GET_RXerrors='{if ($0 ~ /RX packets:/) {split($3, a, ":"); RXerrors=a[2]}}'
GET_TXbytes='{if ($0 ~ /TX bytes:/) {split($6, a, ":"); TXbytes= a[2]}}'
GET_TXerrors='{if ($0 ~ /TX packets:/) {split($3, a, ":"); TXerrors=a[2]}}'
GET_ALL="$GET_MAC $GET_IPv4 $GET_IPv6 $GET_COLLISIONS $GET_RXbytes $GET_RXerrors $GET_TXbytes $GET_TXerrors"
FILL_BLANKS='{length(speed) || speed = "<n/a>"; length(duplex) || duplex = "<n/a>"; length(IPv4) || IPv4 = "<n/a>"; length(IPv6) || IPv6= "<n/a>"}'
BEGIN='BEGIN {RXbytes = TXbytes = collisions = 0}'
echo "$HEADER"
for iface in `$CMD_LIST_INTERFACES`
do
# ethtool(8) would be preferred, but requires root privs; so we use dmesg(8), whose [a] source can be cleared, and [b] output format varies (so we have less confidence in parsing)
SPEED=`dmesg | awk '/[Ll]ink( is | )[Uu]p/ && /'$iface'/ {for (i=1; i<=NF; ++i) {if (match($i, /([0-9]+)([Mm]bps)/)) {print $i} else { if (match($i, /[Mm]bps/)) {print $(i-1) "Mb/s"} } } }' | sed '$!d'`
DUPLEX=`dmesg | awk '/[Ll]ink( is | )[Uu]p/ && /'$iface'/ {for (i=1; i<=NF; ++i) {if (match($i, /([\-\_a-zA-Z0-9]+)([Dd]uplex)/)) {print $i} else { if (match($i, /[Dd]uplex/)) {print $(i-1) } } } }' | sed 's/[-_]//g; $!d'`
$CMD $iface | tee -a $TEE_DEST | awk "$BEGIN $GET_ALL $FILL_BLANKS $PRINTF" name=$iface speed=$SPEED duplex=$DUPLEX
echo "Cmd = [$CMD $iface]; | awk '$BEGIN $GET_ALL $FILL_BLANKS $PRINTF' name=$iface speed=$SPEED duplex=$DUPLEX" >> $TEE_DEST
done
fi
elif [ "x$KERNEL" = "xSunOS" ] ; then
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