[SOLVED] Search pattern and assign to Variable

uk.engr · 10-23-2012, 02:56 AM

Assalam o Alaikum!

I used this command to search particular pattern from file:

grep -n "em16" abc.txt

--> em16 value1d 234

I want to assign this random value "234" to variable? for every time this value changes, I want to filter out other text and want this random value 234 to be assigned to variable.

thanks!

chrism01 · 10-23-2012, 04:47 AM

If that's exactly one space between the fields, then

Code:

a=$(grep -n "em16" t.t|cut -d' ' -f3)
echo $a
234

For more spaces between each field, use awk

Code:

b=$(grep -n "em16" t.t|awk '{print$3}')
echo $b
234

uk.engr · 10-23-2012, 05:11 AM

Thanks dear, this helps me to proceed ahead

David the H. · 10-23-2012, 11:47 AM

There's no need to combine grep and awk (or grep and sed). Just use the one that has the greater flexibility.

Code:

b=$( awk '/em16/ { print $NF }' abc.txt )
b=$( sed -n '/em16/ s/.* //p' abc.txt )

NF in awk represents the final field, no matter what it is. In the sed expression "s/.* //" removes everything up to and including the final space in the line.