Evaluation of arithmetic expressions in shell
export x=3
echo $x + 1
3+1
echo $(expr $x + 1)
4
echo $((x+1))
4
echo $(($x + 1 ))
4
echo $(expr $x+1)
3+1
Example from exercises for Week 2, Linux for Developers
by The Linux Foundation
export x=3
echo $x + 1
3+1
echo $(expr $x + 1)
4
echo $((x+1))
4
echo $(($x + 1 ))
4
echo $(expr $x+1)
3+1
Example from exercises for Week 2, Linux for Developers
by The Linux Foundation