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That was an example of my file.. My file does not have any numbers. So i need to select it from the existence of Particular Character, For Example,

Event ID =1
.
.
.
.
EventID=25
.
.
.
....

I need to delete half(approx) the file or select half the file by existence of some character

My file looks like

1
2
3
4
.
.
.
50
.
.
100I need to select only 50 to rest of the file...

Thanks Ahamed it worked!!! I need for Alphanumeric so, used the below code,

val=`echo $SET_PARAMS | sed 's/.*Portfolio_Parm="\([0-9a-zA-Z]*\)".*/\1/g'`

$SET_PARAMS='-param Run_Type_Parm=Month -param Portfolio_Parm="997" -param From_Date_Parm="2011-08-09"'

Want to extract the value of "Portfolio_Parm" from $SET_PARAMS i.e in the above case "997"...