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help to get the biggest partition with awk

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Top Forums Shell Programming and Scripting help to get the biggest partition with awk
# 1  
Old 07-20-2012
help to get the biggest partition with awk
Code:
# fdisk -l /dev/sda
 
Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x85bda12f
 
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1              63    62926604    31463271   83  Linux
/dev/sda2        62926605    83907494    10490445   83  Linux
/dev/sda3        83907495  1953520064   934806285   83  Linux

The size is END -START, how to get the biggest partition: /dev/sda3
Last edited by yanglei_fage; 07-20-2012 at 11:47 AM..
# 2  
Old 07-20-2012
The size is also in the Blocks columns, that will save you computing it.
# 3  
Old 07-20-2012
Quote:
Originally Posted by jlliagre
The size is also in the Blocks columns, that will save you computing it.
Thanks, I just want to use "-" haha

Lei
# 4  
Old 07-20-2012
Quote:
Originally Posted by yanglei_fage
Thanks, I just want to use "-" haha

Lei
If you just want for fun.. Here is a way : )
Code:
awk 'BEGIN {m=0} /^\// { m=($3-$2>m)?$3-$2:m} END {print m}'

# 5  
Old 07-20-2012
Why would you use "-" ?? Smilie
# 6  
Old 07-20-2012
Code:
BEGIN {m=0}

is unnecessary with awk as m value is already 0 at first use.

---------- Post updated at 13:58 ---------- Previous update was at 13:54 ----------

Quote:
Originally Posted by PikK45
Why would you use "-" ?? Smilie
One reason might be fdisk append + to the Blocks column if there is an odd number of sectors in the partition.
These 2 Users Gave Thanks to jlliagre For This Post:
clx PikK45
# 7  
Old 07-20-2012
Quote:
Originally Posted by clx
If you just want for fun.. Here is a way : )
Code:
awk 'BEGIN {m=0} /^\// { m=($3-$2>m)?$3-$2:m} END {print m}'


can you point me where is wrong for mine
Code:
awk '/^\// {if ($3-$2>max) max=$3-$2 fi} END {print max}'

if I change to not use "-", it works

Code:
awk '/^\// {if ($4>max) max=$4 fi} END {print max}'

another quesion is

I want to out put /dev/sda3. which is the max partition
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