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- #!/bin/sh
- usage () {
- cat <<EOF>&2
- Usage: ${0##*/} [INTERFACE]
- Return up and down transmission speed on given interface. If not given, use the
- first online interface returned by ifconfig (lo is ignored).
- EOF
- }
-
- [ $# -gt 1 ] && usage && exit 1
- [ "$1" = "-h" ] && usage && exit
- if [ -n "$1" ]; then
- interface="$1"
- else
- interface="$(ifconfig | grep -vm1 '^lo\|^ \|^$' | cut -f1 -d':')"
- ## AWK alternative
- # ifconfig | awk -F: '!/^ / && !/^$/ && $1!="lo" {print $1;exit}'
- fi
- if [ ! -d "/sys/class/net/${interface}" ]; then
- echo >&2 "Error: no such interface: ${interface}"
- else
- path="/dev/shm/netspeed"
- time=$(date +%s)
- read -r rx < /sys/class/net/"$interface"/statistics/rx_bytes
- read -r tx < /sys/class/net/"$interface"/statistics/tx_bytes
- if [ ! -f "$path" ]; then
- echo "$time $rx $tx" > "$path"
- chmod 0666 "$path"
- fi
- read -r time_old rx_old tx_old < "$path"
- echo "$time $rx $tx" > "$path"
- time_diff=$((time - time_old))
- if [ "$time_diff" -gt 0 ]; then
- rx_rate=$(((rx - rx_old) / time_diff))
- tx_rate=$(((tx - tx_old) / time_diff))
- [ "$rx_rate" -gt 1024 ] && rx_rate=$((rx_rate / 1024)) && rx_unit=K
- [ "$rx_rate" -gt 1024 ] && rx_rate=$((rx_rate / 1024)) && rx_unit=M
- [ "$tx_rate" -gt 1024 ] && tx_rate=$((tx_rate / 1024)) && tx_unit=K
- [ "$tx_rate" -gt 1024 ] && tx_rate=$((tx_rate / 1024)) && tx_unit=M
- printf "%s %s↓ %s %s↑" "$rx_rate" "$rx_unit" "$tx_rate" "$tx_unit"
- fi
- fi
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