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Time taken to execute a ksh

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# 1  
Time taken to execute a ksh


I am executing a ksh.
I want to note the time taken to execute each command that are executed in the ksh and write it in a log file.
Also I want to note the total time taken to execute the ksh.

How can I do that?What is the command to do that?
# 2  
try using timex command
go through the man page of timex
# 3  
You could also use the shell built-in variable $SECONDS
#script commands go here
echo elapsed time is $((END-START)) seconds

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