source code of /small-scripts/stackexchange/uptimerecord

Last modified	2016-10-23
Lines	48

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1. #!/bin/sh

3. format_time ()

4. {

5.     t=$1

7.     days=$(($t / 86400))

8.     t=$(($t - 86400*$days))

10.     hours=$(($t / 3600))

11.     t=$(($t - 3600*$hours))

13.     minutes=$(($t / 60))

14.     t=$(($t - 60*$minutes))

16.     echo "$days days $hours hours $minutes minutes $t seconds"

17. }

19. main ()

20. {

21.     record_file="$1"

22.     # Old record

23.     record="$(cat "$record_file")"

25.     # When the system started.

26.     boot="$(date -d "$(uptime -s)" '+%s')"

27.     while true; do

28.         # You could also calculate the uptime before the loop and just

29.         # increment it, but that will rely on the script running 24/7.

30.         now="$(date '+%s')"

31.         current_uptime="$(($now - $boot))"

32.         # Set and save the record when it gets beaten

33.         if [ "$current_uptime" -gt "$record" ]; then

34.             record="$current_uptime"

35.             echo "$record" > "$record_file"

36.         fi

37.         # Status should be printed _after_ potentially having set

38.         # a new record:

39.         clear

40.         echo "Current uptime: $(format_time "$current_uptime")"

41.         echo "Record uptime: $(format_time "$record")"

42.         # Don't waste system resources for silly things.

43.         sleep 1

44.     done

45. }

47. main ~/uptimerecord.data