52 lines
1.3 KiB
Bash
Executable File
52 lines
1.3 KiB
Bash
Executable File
#!/bin/sh
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if [ "$1" = "-h" ] || [ $# -gt 1 ]; then
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cat<<EOF
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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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exit
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fi
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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 "Error: no such interface: ${interface}" >&2
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else
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path="/dev/shm/netspeed"
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time=$(date +%s)
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read rx < /sys/class/net/${interface}/statistics/rx_bytes
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read tx < /sys/class/net/${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 "$path"
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fi
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read time_old rx_old tx_old < "$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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[ "$tx_rate" -gt 1024 ] && tx_rate=$(($tx_rate / 1024)) && tx_unit=M
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echo -n "$rx_rate $rx_unit↓ $tx_rate $tx_unit↑"
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fi
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fi
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