awk help needed

[Jamon Camisso]

Giles Orr wrote:
> 2009/7/18 Alex Beamish <talexb-Re5JQEeQqe8AvxtiuMwx3w at public.gmane.org>:
>> On Sat, Jul 18, 2009 at 11:46 AM, Giles Orr<gilesorr-Re5JQEeQqe8AvxtiuMwx3w at public.gmane.org> wrote:
>>> By way of introduction: I'm finally, finally trying to get a new
>>> edition of the Bashprompt HOWTO out there.  This will probably result
>>> in me posting a lot of detailed and mildly weird questions to this
>>> list.  This is the first.
>>>
>>> The intention of this script is to figure out how much space the files
>>> in the current directory take up.  There are about a million ways to
>>> do this - and yes, I know that "ls -l" spits out a "total" line: I
>>> don't know what it's totaling, but my math has never agreed with it
>>> ... feel free to explain though.  I decided that I'd like to do this
>>> as much in awk as possible since it does decimal math (unlike bash)
>>> and it's certainly the easiest way to do the text parsing.  I've tried
>>> bc as well, but you have to use other utility programs to parse and
>>> split the input for it.
>> Sorry, but I usually use the du command for this.
>>
>>  root at music:/etc/init.d# du -h .
>>  504K    .
>>
>> Sometimes I want to know how heavy an entire tree is, so I use
>>
>>  $ du -sh foo
>>
>> The 'h' argument does intelligent size management, so shows K, M and G.
> 
> I would love to use "du" because initially it seems like precisely the
> right tool ... but I want only the sum of the sizes of the files in
> the current directory, and "du" is by default recursive (which also
> makes it painfully slow to return, not a good thing for something
> incorporated into a Bash prompt).  If it's possible to stop "du" from
> recursing, I'll use it immediately - but that looks difficult to
> impossible.  Any thoughts?
> 
> Thanks to everyone else who answered too: it all helped.  It certainly
> sounds like piping into "awk" is the way to go rather than trying to
> write a self-contained "awk" script.
> 

Try this:

#!/bin/bash

i=0 j=0 k=0
echo -n "Enter directory: "
read dir
for i in `ls $dir`
   do
     if [ -f $i ]; then
       j=`du -s $i |awk '{print $1}'`
       k=`expr $k + $j`
     fi
   done
echo $k

Jamon
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