extracting desired value from cmd o/p

Shell Programming and Scripting
1

Hi

I m using vxassist cmd to get avaialbe space in DG o/p is like this, wat I need is only numeric value of the o/p , I have a solution is anyone can provide better

x1# vxassist -g appdg1 maxsize
Maximum volume size: 90406912 (44144Mb)

I need only 44144 value command I m using rite now is

x1# vxassist -g appdg1 maxsize | awk '{print $5}' | cut -f1 -d")" | sed -e 's/(//' | sed -e 's/Mb//'

44144

regrds
TaD

2

Above string can be parsed using sed like below

$  echo "Maximum volume size: 90406912 (44144Mb)"|sed 's/\(.*(\)\([0-9].*\)\(Mb.*\)/\2/'
44144
$
3

quiet a complex syntax , if u don't mind ranjith could please explain wat exactly this syntax is doing

I try digging man pages wasn't successful

s/\(.*(\)\([0-9].*\)\(Mb.*\)/\2/

regrds
TaD

4

no need of such complex sed for this..

echo "Maximum volume size: 90406912 (44144Mb)"|awk -F"[(Mb)]" '{print $3}'
5

not working o/p is blank now

1:ksh# vxassist -g appdg1 maxsize |awk -F"[(Mb)]" '{print $3}'

1:ksh#

6

working fine..

fnsonlu1-/home/fnsonlu1> echo "Maximum volume size: 90406912 (44144Mb)"|awk -F"[(Mb)]" '{print $3}'
44144
fnsonlu1-/home/fnsonlu1>
7

In sed we can give sub patterns like \(pattern\) and I have sub divided your data 'Maximum volume size: 90406912 (44144Mb)' into three sub patterns

  1. Maximum volume size: 90406912 ( - \(.*(\)
    this will represent data the from beginning of the data to '('

  2. 44144 - \([0-9]*\)
    this will represent coninuous occurance of digits after '('

  3. Mb) - \(Mb.*\)
    this will represent the data from Mb to end of line

    and I have used \2 to print only the second pattern.

sed 's/\(.*(\)\([0-9].*\)\(Mb.*\)/\2/'

Regards,

Ranjith

8

small change..

echo "Maximum volume size: 90406912 (44144Mb)"|sed 's/\(.*\)(\(.*\)Mb)/\2/g'