9 ms·
There is also the inbuilt variable $SECONDS, which seconds since the instance of bash was started. Makes it really easy to do 'time elapsed' at the end of a bas
by vacri 9y ago
There is also the inbuilt variable $SECONDS, which seconds since the instance of bash was started. Makes it really easy to do 'time elapsed' at the end of a bash script.
$ echo $SECONDS
83783
$ echo $SECONDS
83784
$ echo $SECONDS
83787
- monsieurbanana 9y agoThat's nifty. $ echo "$SECONDS / 60 / 60" | bc 362.38500000000000000000
- 1024core 9y ago"bc", without the "-l" option, will give you integers only. So the response of the command above will be "362", and not "362.38500000000000000000"
- mikegerwitz 9y agoecho "$(( SECONDS / 60 / 60 ))"
- vram22 9y agoecho "scale=2; $SECONDS / 60 / 60" | bc # will give 2 digits after the decimal point, instead of bc -l which gives more digits of precision after the decimal point, than we may usually want for this particular calculation.
- lozf 9y agoRecently I needed results that included nothing after the decimal point, so resorted to awk to do the math: awk "BEGIN { print int($SECONDS /60 /60)}"
- vram22 9y agoInteresting. I suppose you had to type Ctrl-D or Ctrl-Z to signal no input to awk, since it expects some in the above command? Never tried running awk without either a filename as input or stdin coming from a file or a pipe. Will check it and see what happens. Modifying my example from above: echo "scale=0; $SECONDS / 60 / 60" | bc might also work, need to check.
- otherflavors 9y agoprintf "%s 60 60 *2k/p" "$SECONDS" | dc
- samueloph 9y agoI prefer to use time when i want to know how much time some script took: $ time sleep 2 real 0m2.003s user 0m0.002s sys 0m0.001s
- alexanderdmitri 9y agoYeah, SECONDS is great. I just discovered this a few days ago to get a general idea of execution time for each process a script handles: # At top of script SECONDS = 0 # script commands ... # At bottom of script duration=$SECONDS echo "$(($duration / 60)) minutes and $(($duration % 60)) seconds elapsed."