UNIX for Dummies Questions & Answers

thank you for all this method was work very fine
x=`sed -n 1p Husam1.sh|awk -F"^" '{print $1}'|cut -c 1-12`
y=`sed -n 2p Husam1.sh|awk -F"^" '{print $7}'|cut -c 5-14`

but I need some one to explain in breaif becuase I don't under stand this two statment.

and can any help,
how can I subtract x from itself or any variable like it so I can get the result
for example if i subtract x from It self i will get zero

sorry , my freinds but i am new for the Unix

thanks a lot

Space is needed before and after minus operator

Code:

result=`expr $x - $y`

Code:

(( result = x - y ))