Checking filesize in bash on diff systems: Debian, HP-UX, AIX and SUN

Hi, im just creating script, that will check max filesize before copying.

Testing filesize is exactly 45MB created by:

dd if=/dev/zero of=test.dat bs=47185920 count=1

I created it on linux Debian, like that and its work fine:

Code:

#!/usr/bin/bash

maxsize=50

actsize=$(du -b $1 | cut -f 1)

if [ $actsize -ge $maxsize ]; then

echo "size $actsize is over $maxsize" & exit 2

else

echo "size is $actsize, its OK"

fi

but, on SUN OS doesnt work "du -b"

so, i created somethink like that:

Code:

#!/usr/bin/bash

maxsize=50

actsize=$(du -skh $1 | cut -f 1 | cut -c -4)

if [ $actsize -ge $maxsize ]; then

echo "size $actsize is over $maxsize" & exit 2

else

echo "size is $actsize, its OK"

fi

this is in MB, but.. it does not matter.

Finaly, but... on AIX, again - this system dont know, what is "du -h", "du -b" etc...

I want, if there is solution like that" one script for all system: debian, HP-UX, AIX and SUN OS.

I have backup idea - make system check and use "for system" solution, but its not what i want.

Anyone have some ideas, types or any advice?

Thanks

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