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Fdisk with grep problem

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# 1  
Old 07-29-2008
Fdisk with grep problem
Hello!

Code:
rescuecd:/var# fdisk -l | grep stupid
Disk /dev/sda doesn't contain a valid partition table
Disk /dev/sdb doesn't contain a valid partition table
rescuecd:/var#

It shows always this statement. Why? Smilie

Raw fdisk -l shows
Code:
rescuecd:/var# fdisk -l

Disk /dev/sda: 750.1 GB, 750156374016 bytes
255 heads, 63 sectors/track, 91201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00000000

Disk /dev/sda doesn't contain a valid partition table

Disk /dev/sdb: 750.1 GB, 750156374016 bytes
255 heads, 63 sectors/track, 91201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00000000

Disk /dev/sdb doesn't contain a valid partition table
rescuecd:/var#

# 2  
Old 07-29-2008
These messages are printed on stderr and not stdout, so they are allways printed.
You can remove stderr messages :
Code:
fdisk -l 2>.dev/null| grep stupid

or redirect stderr to stdout :
Code:
fdisk -l 2>&1 | grep stupid

Jean-Pierre.
# 3  
Old 07-29-2008
Hello!

Thank you! Now it works:

Code:
rescuecd:/var# fdisk -l 2>&1 | grep sda:
Disk /dev/sda: 750.1 GB, 750156374016 bytes

# 4  
Old 07-29-2008
But you haven't solve the problem with your partition, Google for the error message :"Disk /dev/sda doesn't contain a valid partition table".

Regards
# 5  
Old 07-31-2008
Quote:
Originally Posted by Franklin52
But you haven't solve the problem with your partition, Google for the error message :"Disk /dev/sda doesn't contain a valid partition table".

Regards
You mean problem that fdisk don't see valid partition? This is no problem Smilie I've wiped intentionally with dd if=/dev/zero of=/dev/sda bs=512 count=1 becouse I'm testing script to autopartition disk.
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