I have a shell script
#!/bin/bash START=$(date +%s) echo " Start| $START " # do something # start your script work here # # your logic ends here END=$(date +%s) echo " End| $END " DIFF=$(( $END-$START )) echo " Diff in seconds|" $DIFF Still getting this error Start| 1349769151 End| 1349769151 ")49769151rror: invalid arithmetic operator (error token is "
I know it is basic, so I have been searched and debug for two days already. But still gets nothing works on this. Plz help!
The START and END are not in date format which can't be subtracted. If you just want to measure the execution time then use only %s which will give you difference in seconds.
START=$(date +%s) echo " Start| $START " # do something # start your script work here # # your logic ends here END=$(date +%s) echo " End| $END " DIFF=$(( $END-$START )) echo "Diff in seconds:" $DIFF 
do something. Check the code you have in between calculating the time.sleep 5.You are trying to perform arithmetic operations with strings: it will not work.
I suggest you to print the date as a timestamp with date "+%s" and use those numbers for your math.
