[ale] bash assistance

Tue May 10 09:28:55 EDT 2011

Don, (and anybody else),

What does tr "\012" "\011"  do?

Of course I inserted into the code and it works flawlessly, but man tr is very cryptic and I can't seem to find anything on google that explains "\012" "\011" and what it does.  I have read about "octal codes" but "line feed" for 012 and "horizontal tab" for 011.

So is this tr command replacing a "line feed (new line)" with a "tab"?

So:  input gives $HEADER followed by a line feed command which is replaced by a "tab" then the rest is fed through awk to cut the value I wanted.

Damon Chesser
dchesser at acsi2000.com
damon at damtek.com

On Tue, Apr 26, 2011 at 06:01:22AM -0700, Damon Chesser wrote:
> df  -T output is:
> df -T /u008
> Filesystem    Type   1K-blocks      Used Available Use% Mounted on
> /dev/mapper/vgoradata-lv008dat
>           reiserfs   104854396  59278980  45575416  57% /u008
> The above is exactly as it appears in my term (at least in my email client)
> So why does df -T "$MNTP" |awk '{print $5}' produce “Available 57%” when
> the 6th field is actually the one that holds the %used?
> df -T /u008 |awk '{print $6}'
> Use%
> /u008
> And how can I clean up the output to only display %used as a number% like 57%?
> Is there a different command I can run to find this number? (I am looking
> for candidates for increased space).

Damon,

First, if you're combining grep with cut or awk, you should just be using
awk. If you're using awk without a search, you should just be using cut. I
didn't find any Useless Use of Cat, so you're ok there. :)

To fix the display:

# Ignore the header; join any other lines by tab
DF=`df -T "$MNTP" | tail -n +2 | tr "\012" "\011" | awk '{print $6}'`

and

echo "$VG $VGsize $LV $LVsize $MNTP Use% $DF"

If you want it to say "Use%", just print it, don't worry about grepping it
from df. I think that should set you straight.

-Don

> From: ale-bounces at ale.org [mailto:ale-bounces at ale.org] On Behalf Of Jim Kinney
> Sent: Tuesday, April 26, 2011 8:18 AM
> To: Atlanta Linux Enthusiasts
> Subject: Re: [ale] bash assistance
>
>
> $LVM in $DF not defined
> On Apr 26, 2011 7:38 AM, "Damon Chesser" <dchesser at acsi2000.com<mailto:dchesser at acsi2000.com>> wrote:
> > Believe it or not, this is above my rudimentary bash skills and I have hit a wall: So I am seeking advice or pointers.
> >
> > Scenario: recording Volume Group info on a server by server bases.
> >
> > It did not take me long to realize that I wanted to script this. I am putting the output of my script into a spread sheet (copy and paste). The servers I am running this on are remote and I have no convenient way to get the output text to my workstation, so copy and paste works.
> >
> > Desired output:
> >
> > VGname VGsize LVname LVsize LVmount_point %diskused
> >
> > I have all the above working up to LVmount where it all goes horribly bad. Here is my code:
> > -----start-----
> > #!/bin/bash
> >
> > FILE=/tmp/dlc/vginfo_script.txt
> >
> > rm $FILE
> >
> > for VG in `vgdisplay | grep -e "VG Name" | awk '{print $3}'`
> > do
> > VGsize=`vgdisplay $VG |grep -e "VG Size" | awk '{print $3 $4}'`
> > for LV in `vgdisplay -v $VG |grep "LV Name" | cut -d\/ -f4`
> > do
> > LVsize=`lvdisplay /dev/$VG/$LV | grep "LV Size" | awk '{print $3 " " $4}'`
> > # for MNTP in `mount |grep "$LVM" | awk '{print $3}'`
> > # do
> > # DF=`df -T "$MNTP" |awk '{print $6}'`
> > # done
> > echo $VG $VGsize $LV $LVsize $MNTP $DF
> > done
> > done > $FILE
> >
> > ---end----
> >
> > The above code, as written outputs this:
> >
> > vgorabak8 375.00GB lvorabak8 374.90 GB
> > vgorabak7 375.00GB lvorabak7 374.90 GB
> >
> > take out the # above and it does this:
> >
> > vgorabak8 375.00GB lvorabak8 374.90 GB /var/lib/ntp/proc Use% -
> > vgorabak7 375.00GB lvorabak7 374.90 GB /var/lib/ntp/proc Use% -
> >
> > No idea why. This makes my head hurt. I have tried everything I can think of. It seems I don't think enough!
> >
> > Any help would be appreciated.
> >
> >
> >
> >
> > Sincerely,
> >
> > Damon Chesser
> > dchesser at acsi2000.com<mailto:dchesser at acsi2000.com>
> >
> >
> >
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