Displaying long integers

[nashcom]

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:

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!

Thanks.

 

[PHV]

Use the printf awk function.
Another way:
du -sk | awk '{print $1"1000"}'

Hope This Helps, PH.
FAQ219-2884
FAQ181-2886

 

[feherke]

Hi

Just force the formatting :

du -s -k | awk '{print[highlight]f[/highlight] [highlight]"%d\n",[/highlight]$1*1000}'

The actual success may depend on your Awk implementation.

Personally I would use [tt]bc[/tt] instead :

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

Feherke.
[link feherke.github.com/]

http://feherke.github.com/

[/url]

 

[nashcom]

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.

 

[PHV]

Yet another way:
du -sk | awk '{printf "%.0f\n",$1*1000}'

Hope This Helps, PH.
FAQ219-2884
FAQ181-2886

 

[feherke]

Hi

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

I included the [tt]-q[/tt] ( [tt]--quiet[/tt] ) option as once I saw a [tt]bc[/tt] implementation which printed the version information even when input was piped. Just remove it if your [tt]bc[/tt] does not support it.

And a correction, as I forgot that [tt]du[/tt] outputs the path too :

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

Feherke.
[link feherke.github.com/]

http://feherke.github.com/

[/url]

 

[nashcom]

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.

 

[FlorianAwk]

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

1024 = 2^10

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