[NTLUG:Discuss] total drive size

[MadHat]

On Wed, 2003-03-12 at 13:45, Fred James wrote:
> >
> >better yet, just use awk (wasn't thinking before)
> >df -k | grep "^/dev" | awk '{print Total+=$3 }' | tail -1 | awk '{print
> >$1/1024, "Mb used"}'
> >
> >which works with SSH
> >$ ssh dodo df -k | grep "^/dev" | awk '{print Total+=$3 }' | tail -1 |
> >awk '{print $1/1024, "Mb used"}'
> >4638.88 Mb used
> >
> >want to know free?
> >$ ssh dodo df -k | grep "^/dev" | awk '{print Total+=$4 }' | tail -1 |
> >awk '{print $1/1024, "Mb free"}'
> >12722.4 Mb free
> >
> >
> >
> >  
> >
> And if his orginal question was for the total of all space;
> 
> $ ssh dodo df -k | grep "^/dev" | awk '{print Total+=$2 }' | tail -1 |
> awk '{print $1/1024, "Mb free"}'
> 
> will obviously do it.

Right, the $2 is total space, $3 is used space and $4 is free space,
because of the order df outputs the entries.  

Line by line

df -k | \                   # gets the total disk usage info
grep "^/dev" | \            # grabs only the lines that are real devices
awk '{print Total+=$2 }' |\ # keeps the running total and prints it
tail -1 |\                  # grabs the last line (the real total)
awk '{print $1/1024, "Mb"}' # converts it into Mb for easier reading


BTW, this also works on FreeBSD and Solaris

-- 
MadHat at Unspecific.com
`But I don't want to go among mad people,' Alice remarked.
`Oh, you can't help that,' said the Cat: `we're all mad here...'
   -- Lewis Carroll - _Alice's_Adventures_in_Wonderland_