Problems with the export & sed commands... Unexpected respose returned..!

MC1903 · 02-07-2007, 07:20 AM

Hi,

First time here - please be patient with me...

I am having problems getting the export command to work as I expect it should... I have less than 1% Linux know-how and I am really struggling...

If I run:

Code:

fdisk -l /dev/cciss/c0d0 | grep fb | sed -e "s/\/dev\/cciss\/c0d0p\(.\).*/\1/"

directly on the command line, I get the expected response of 6 back.

But when I try the full command:

Code:

export VMFS_PARTITION=`fdisk -l /dev/cciss/c0d0 | grep fb | sed -e "s/\/dev\/cciss\/c0d0p\(.\).*/\1/"`

the actual command ( fdisk -l /dev... ) and not the response ( 6 ) is saved in the $VMFS_PARTITION variable.

I would be eternally grateful if someone can let me know what am I doing wrong?

Martin

rizhun · 02-07-2007, 07:38 AM

Have you tried $()?

export VMFS_PARTITION=$(fdisk -l /dev/cciss/c0d0 | grep fb | sed -e "s/\/dev\/cciss\/c0d0p$.$.*/\1/")

Don't see why it would make a difference, but its worth a try!

Also, try single quotes instead of double quotes on that sed command.

nx5000 · 02-07-2007, 07:41 AM

Strange. Which shell are you running? (echo $0 will tell you)
I modified a bit your line to

export SWAP_PARTITION=`fdisk -l /dev/hda | grep swap | sed -e "s/\/dev\/hda$.$.*/\1/"`
echo $SWAP_PARTITION
5

It works.

MC1903 · 02-07-2007, 09:51 AM

Hi,

Thankyou both for your quick replies... I used Rizhun's $() method and it worked first time...

echo $0 returns -bash

I am wondering if I should use a different text editor - perhaps I had a rogue character/code - any suggestions? I am using NotePad++ at the moment...

Once again, Thankyou.
Martin

nx5000 · 02-07-2007, 12:53 PM

gedit
nedit
kate

vim

Yes, bad characters can create problems

wpn146 · 02-07-2007, 04:20 PM

If the editor is designed for MSDOS style of line termination (<cr><lf>) the <cr> will mess up a script.