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I can't come to think of any other way than just grep, but hopefully someone can give me a hint...

In a script I am working on, I need to get which scsi channel a disk is connected to.
I know it's devicename, which is sdc.

With this knowledge, I run hdparm -I /dev/sdc and grep for "Model number:",
through awk, I get it's model number, and run the command scsiadd -p and gep for the model number.

I get the line with the model number,
what I need though, it the line just right above.
I need to find out what scsi channel the disk is connected to so that I can runt scsiadd -r 3 0 0 0 (in this case)

Code:

Host: scsi3 Channel: 00 Id: 00 Lun: 00
Vendor: ATA      Model: ST3120026AS      Rev: 8.05
Type:   Direct-Access                    ANSI  SCSI revision: 05

Now is just the question, through the way I am grepping for model number, is there anyway I can get the line above?
The extraction of the numbers I'll do with more greps and awk's (unless someone has another idea).

I hope I am making myself understood enough.. I'm getting frustrated and are not entirely sure I describe my problem in a good enough way

Moderator's Comments:

You got 40 posts already, please use code tags in the future, thanks.

Code:

sed -n '/Model:/N; /Channel:/p'

Just keep the previous line in awk:

Code:

awk '{ if($0 ~ /Model:/) { print ll; } ll=$0 }'

As citaylor says - it could look like (if I got it right):

Code:

awk '/^Host:/ {sub(/scsi/,"",$2); a=$2; b=$4; c=$6; d=$8} /ST3120026AS/ {printf("scsiadd -r %i %i %i %i\n", a,b,c,d)}' infile
scsiadd -r 3 0 0 0

And maybe use system() to execute it or execute it with shell's $().

Kudos to verdepollo for giving you what you asked for. Here's what I think you need:

Code:

MODEL=$(hdparm -I /dev/sdc | <some code here>$)
scsiadd -p |  
awk '/^Host: scsi/ { scsiid=substr($2,5,1) " " $4 " " $6 " " $8 }
       /Model: '"$MODEL"/' { print scsiid; found=1; exit(0); }
       END { exit(1-found); }'

---------- Post updated at 05:55 PM ---------- Previous update was at 05:52 PM ----------

Zaxxon and I posted about the same time. We take the same general approach but vary in our actual tactics. The exit() condition in mine allows you to test the return code of the command to see if it worked, ie, to put in a script, pipeline or if statement and fail appropriately.

Sometimes a little truss/tusc/strace, strings on commands, or man page reading, can reveal where the information is stored in flat file land!

Important: What Operating System and version are you running?
What hardware do you have?

Posting hardware enquiry comands out of context means nothing without knowledge of the command syntax and the hardware.

What is the output from:

Code:

ls -lad /dev/whatever_your_device_is_called

This should produce a unique identity mappable to the SCSI ID given your knowledge of your Operating System and hardware configuration.