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