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Calculate network speed

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This script calculates the network speed up/down

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  1. #!/bin/bash
  2.  
  3. # This shell script shows the network speed, both received and transmitted.
  4.  
  5. # Usage: net_speed.sh interface
  6. #   e.g: net_speed.sh eth0
  7.  
  8. # Global variables
  9. interface=$1
  10. received_bytes=""
  11. old_received_bytes=""
  12. transmitted_bytes=""
  13. old_transmitted_bytes=""
  14.  
  15. # This function parses /proc/net/dev file searching for a line containing $interface data.
  16. # Within that line, the first and ninth numbers after ':' are respectively the received and transmited bytes.
  17. get_bytes()
  18. {
  19.     line=$(cat /proc/net/dev | grep $interface | cut -d ':' -f 2 | awk '{print "received_bytes="$1, "transmitted_bytes="$9}')
  20.     eval $line
  21. }
  22.  
  23. # Function which calculates the speed using actual and old byte number.
  24. # Speed is shown in KByte per second when greater or equal than 1 KByte per second.
  25. # This function should be called each second.
  26. get_velocity()
  27. {
  28.     value=$1
  29.     old_value=$2
  30.  
  31.     let vel=$value-$old_value
  32.     let velKB=$vel/1024
  33.     if [ $velKB != 0 ];
  34.     then
  35.  echo -n "$velKB KB/s";
  36.     else
  37.  echo -n "$vel B/s";
  38.     fi
  39. }
  40.  
  41. # Gets initial values.
  42. get_bytes
  43. old_received_bytes=$received_bytes
  44. old_transmitted_bytes=$transmitted_bytes
  45.  
  46. # Shows a message and waits for one second.
  47. echo "Starting...";
  48. sleep 1;
  49. echo "";
  50.  
  51. # Main loop. It will repeat forever.
  52. while true;
  53. do
  54.  
  55.     # Get new transmitted and received byte number values.
  56.     get_bytes
  57.  
  58.     # Calculates speeds.
  59.     vel_recv=$(get_velocity $received_bytes $old_received_bytes)
  60.     vel_trans=$(get_velocity $transmitted_bytes $old_transmitted_bytes)
  61.  
  62.     # Shows results in the console.
  63.     echo -en "$interface DOWN:$vel_recv\tUP:$vel_trans\r"
  64.  
  65.     # Update old values to perform new calculations.
  66.     old_received_bytes=$received_bytes
  67.     old_transmitted_bytes=$transmitted_bytes
  68.  
  69.     # Waits one second.
  70.     sleep 1;
  71.  
  72. done

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