Extract and place in variable

Shell Programming and Scripting
1

If i wanted to extract the number of collisions from the eth0 section of the ifconfig file and have the output placed in a variable how would i do this?
I can get the output displayed using:

/sbin/ifconfig eth0 | grep "collisions"

What command would i now use to place the output in a variable known as "Collisions"?

2

The followmnmg will do what you are after:

COLLISIONCOUNT=`/sbin/ifconfig eth0 | grep "collisions"`
COLLMAX=99
if [ ${COLLISIONCOUNT} -gt ${COLLMAX} ] then
  echo "Collision count is greater than ${COLLMAX}!"
else
  echo "Collision count is less than than `expr ${COLLMAX}+1`!"
fi

It is the ` characters that run what is inside them and cause the output to be passed to the variable before the equals sign.