Shell Programming and Scripting

Hi Guys,

Thanks for your replies (damned internet connection been down *shakes fist*).

Anyway, I've tried the ideas on here but still can't seem to get it to work. If I try the following code:

Code:

USAGEPERCENT=$( awk "BEGIN{print ${ARR[21]} / ${ARR[19]}}" )
USAGEPERCENTTOTAL=$( awk "BEGIN{print int ${USAGEPERCENT1} * 100}" )

Then, I get the following output when I do 'set -x' to see whats going on:

Code:

++ awk 'BEGIN{print 79.436165 / 494.937500}'
+ USAGEPERCENT=0.160497
++ awk 'BEGIN{print int 0.160497 * 100}'
awk: BEGIN{print int 0.160497 * 100}
awk:                 ^ syntax error

Any ideas on how I can get around this ? All the examples above work fine in the command line when using numbers, although I can't get it to work when I attempt to run it in the script when taking values from an array.

Or, is there another way to take the output from my 'USAGEPERCENTTOTAL' and strip everything after the whole number ? I'm not concerned with anything other than the whole number and it's only a rough usage total so no need to carry-forward etc.

[edit]Should have said originally guys, i'm doing this in the bash shell.


Thanx

Jim

Hi Jimbob,

Not very good with awk but I thought that integers were whole numbers - are you just trying to get the percentage rounded down to the nearest whole number here?

Regards

Dave

Hi Dave,

Thanks for your reply.

Yeah, that's ideally what I'm trying to do! Later on in my script, i'm using '-gt' to find if the usage is greater than 90%, and it's failing then because '-gt' doesn't work with floating point numbers.

Figured that having a whole number after working out the percentage is easier than changing the IF statement using '-gt'!


Thanx

Jim

Hi Jimbob,

As I said not very good with awk, but I think it should be something like;

Code:

'{printf("%d", 0.160497 * 100)}'

Hope that helps.

Regards

Dave

Hi Dave,

Thanks for your reply.

I've tried that, and it works fine - however, if I substitue the number for my variable then it fails with a syntax error, like:

Code:

'{printf("%d", ${USAGEPERCENT}  * 100)}'

Do you know if it can be done this way ? It's driving me insane!!


Thanx

Jim

Hi Jimbob,

As I said I'm a bit restricted as to what I can do with awk, but it may be the variable itself - I'm not sure if it should be prefixed with the $ and enclosed in {} - you could try it without. I'd try without the braces first.

Sorry to say you may have to wait for an awk GURU to answer the post

Regards

Dave

Code:

USAGEPERCENT=$( awk "BEGIN{print ${ARR[21]} / ${ARR[19]}}" ) 
USAGEPERCENTTOTAL=$( awk -v p="{USAGEPERCENT}" 'BEGIN{print int (p * 100)}' )