How to static the average value

yanglei_fage · #1 (**permalink**) 04-22-2009

Hi all,

Sorry I make a mistake,the title should be "How to statistic the average value "

I do five times about "mv 123 to 456"
and do five times about "mv 456 to 123"
As we know,"time" can get the real usr sys value,
I want to get the average real,usr,sys of "mv 123 to 456" and "mv 456 to 123"

Quote:

#!/bin/bash
for ((i=1;i<=10;i+=1));do
echo "mv 123 to 456 the $i \n"
time mv 123 456;
echo "mv 456 to 123 the $i \n"
time mv 456 123;
done

I named it "test"

leiyang@leiyang-laptop:~$ ./test
mv 123 to 456 the 1 \n
real 0m0.005s
user 0m0.004s
sys 0m0.000s
mv 456 to 123 the 1 \n
real 0m0.004s
user 0m0.000s
sys 0m0.004s
mv 123 to 456 the 2 \n
real 0m0.004s
user 0m0.000s
sys 0m0.004s
mv 456 to 123 the 2 \n
real 0m0.004s
user 0m0.000s
sys 0m0.004s
mv 123 to 456 the 3 \n
real 0m0.008s
user 0m0.000s
sys 0m0.004s
mv 456 to 123 the 3 \n
real 0m0.005s
user 0m0.000s
sys 0m0.008s
mv 123 to 456 the 4 \n
real 0m0.004s
user 0m0.000s
sys 0m0.004s
mv 456 to 123 the 4 \n
real 0m0.002s
user 0m0.000s
sys 0m0.004s
mv 123 to 456 the 5 \n
real 0m0.002s
user 0m0.000s
sys 0m0.000s
mv 456 to 123 the 5 \n
real 0m0.002s
user 0m0.000s
sys 0m0.000s

for example :
for "mv 123 to 456"
I want to got real_average_123_to_456=(real+real+real+real+real)/5 (here real is for "mv 123 to 456'' in each time),also want to get usr_average_123_to_456,sys_average_123_to_456

for "mv 456 to 123"
I want to got real_average_456_to_123=(real+real+real+real+real)/5 (here real is for "mv 456 to 123'' in each time),also want to get usr_average_456_to_123,sys_average_456_to_123

how can I modify above code.I'm poor in bash shell.please show me a light

kodak · #2 (**permalink**) 04-22-2009

bash does not do floating point math by itself. Since you have to convert the output of time into something you can do math on, this whole thing scream "use perl" to me.

As a hint, though, look at your man page for time. On Linux you can do "time -p" and it will output in a decimal value instead of tacking on the minute and second units.

colemar · #3 (**permalink**) 04-22-2009

Quote:

Originally Posted by kodak

bash does not do floating point math by itself

But apparently ksh does:

Code:

colemar@deb:~$ echo $((1.0/7))
bash: 1.0/7: syntax error: invalid arithmetic operator (error token is ".0/7")
colemar@deb:~$ ksh
$ echo $((1.0/7))
0.142857142857142857

kodak · #4 (**permalink**) 04-22-2009

hah, sweet. I never use ksh, thanks.

yanglei_fage · #5 (**permalink**) 04-23-2009

Thanks for the reply, If we use ksh, How can we got the answer.
Anyone can post the code?

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