OK...I need some shell script help..

[Rita C Workman]

I am down to the last of this thing...and I have lost it.
Take a look at the attached file that is giving me a headache. This is what I've created for doing disk mapping on multiple systems. I did it on 4 servers attached to our EMC disk array..
Each record can have between 3-5 fields (depending on if it's attached to lvol/filesystem or not)

What I am trying to do is get the alternate link (second line of same value as $1) to also print what is reported in the primary disk/lvol/file_sys line.
AND then I want to print a fairly clean report with a space in between different values of $1. Nothing fancy.

This is that disk mapping program I have been working on....and I'm down to this...
..ps..can you tell I am NOT a programmer ! Everytime I try to printf...it blows up because the first line does not have a value for $4 or $5 ... arghghgh !! I've been doing this in Posix Shell. My code is sloppy, but it got me to here..any Help would be appreciated !!

$1 = EMC info
$2 = hostname
$3 = disk addr info
$4 = /dev/vg/lvol
$5 = file_system

Thanks,
Rita

[Vikas Khator]

Hi ,

How about sorting your file on first & fourth field and then applying your logic.

[Fred Myers]

Actually EMC has software called I believe ECC that will do exactaly that and let you save it as a flat file, you can even import it into excell as a CSV and sort it if you want. Or you can use the HP utility inq.HP that is a free EMC HP binary awk out each servers information sort it compare it to /etc/lvmtab to get lvol info and the append it to a file on a leveraged machine with a `hostname` placed between them.

[RikTytgat]

Rita,

I'd love to help you, but it would be easier if you submit your script!

Bye,
Rik.

[James A. Donovan]

If you're just worried about the values of $4 and $5 being null, why not just test them before calling your printf statement? If they are null, then set them to some arbitrary value like "-" or "N/A".

[Tom Danzig]

I'm not sure I get exactly what you want, but you can try this:

awk '{if(NF==5){printf("\n%25s %10s - %s, Alt: %s\n",$4,$5,prev3,$3)}prev1=$1;prev3=$3}' name_of_your_file

Maybe you could post what you want the output to say and look like.

[Bill Hassell · Accepted solution]

Here's a POSIX/ksh script that will filter stdin into 5 parameters with missing parameters changed to " "

---

#!/usr/bin/sh
# Usage: cat somefile | parm5
# Output is always 5 values

# To remove the leading : use this:
# echo ${SN#:} ${HN#:} $DEV ${LVOL:-" "} ${MNT:-" "}

while read SN HN DEV LVOL MNT
do
echo $SN $HN $DEV ${LVOL:-" "} ${MNT:-" "}
done

---

The key is using shell parameter expansion. If LVOL or MNT are null or undefined, the result will be " " (or whatever you'd like). To use this script:

cat InputFile | this_script

Output will always be 5 values. Or you can pull the snippet into your script.

[RikTytgat]

Hi,

What I would do:

while read line
do
set -- $line "" "" "" "" ""
done < your_file

That way, $1 to $5 always get filled up, even when your line only contains 3 (or less) fields (words). The 4th and 5th word will be empty, but you will not get an error (be sure to quote your variables when doing a prinf!!)

Hope this helps,
Rik.

[Carlos Fernandez Riera]

join is very usefull for me.

See also:

http://forums.itrc.hp.com/cm/QuestionAnswer/1,1150,0x5cfe6c96588ad4118fef0090279cd0f9,00.html

[Danny Engelbarts]

Rita,

a very simple printf statement in the posix shell;

printf "%-x.xs%-x.xs%-x.xs%-x.xs%-x.xs\n" "$1" "$2" "$3" " $4" " $5"

where -x.x is used for presentation ;o)

by adding the space in front of $4 and $5 the argument to printf is always filled.

Greetz, Danny.