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Displaying long integers

Displaying long integers

Displaying long integers

Is it possible to print a larger number than a standard 32bit integer?

For example, I need to output the size of a directory in bytes, and the directory is 6GB.

I've tried a few things, but the simplest line is:

CODE -->

du -s -k | awk 'print $1*1000}' 

The -k option lists the directory size in KB, but I need the (rough) size in bytes so multiply it by 1000, but awk prints it as 6.1444e+09.

I've lived with this problem for ages, but would love to know how to get around it!


RE: Displaying long integers


Just force the formatting :


du -s -k | awk '{printf "%d\n",$1*1000}' 
The actual success may depend on your Awk implementation.

Personally I would use bc instead :


echo "$( du -s -k )*1000" | bc -q 


RE: Displaying long integers

Thanks very much.

The first example concatenating the $1 and "000" works well enough - I just wasn't sure how to join the number and the string.

The printf %d returns a strange number (-2147483648). I'd been using printf %d in my code, and if I see that number being printed it means the directory is big!

My bc also says that -q is an illegal option.

Thanks again.

RE: Displaying long integers


Quote (nashcom)

My bc also says that -q is an illegal option.
I included the -q ( --quiet ) option as once I saw a bc implementation which printed the version information even when input was piped. Just remove it if your bc does not support it.

And a correction, as I forgot that du outputs the path too :


echo "$( du -s -k | cut -f1 )*1000" | bc 


RE: Displaying long integers

Thanks very much for all the help - those methods work great.

I don't really know what I'm doing with it, so it takes me a while to work things out, but Unix scripting is fabulous in its power and flexibility.

RE: Displaying long integers

1kB = 1024B
1MB = 1024kB
1GB = 1024MB = 1024x1024x1024B

1024 = 2^10

You should multiply by 1024 instead of 1000 to be precise.

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