21 lines
499 B
Plaintext
21 lines
499 B
Plaintext
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#!/bin/ash
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IF=$1
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if [ -z "$IF" ]; then
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IF=`ls -1 /sys/class/net/ | head -1`
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fi
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RXPREV=-1
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TXPREV=-1
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echo "Listening $IF..."
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while [ 1 == 1 ] ; do
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RX=`cat /sys/class/net/${IF}/statistics/rx_bytes`
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TX=`cat /sys/class/net/${IF}/statistics/tx_bytes`
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if [ $RXPREV -ne -1 ] ; then
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let BWRX=$RX-$RXPREV
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let BWTX=$TX-$TXPREV
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echo "$BWRX $BWTX">/tmp/netspeed
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fi
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RXPREV=$RX
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TXPREV=$TX
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sleep 1
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done
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