Linux Shell Calculation with Variables

[Peter.Paul]

Hello Community,
I have a question towards the types of variables in Linux shell



min=4
hour=`sed -n '1p' 1.txt`
z2=$(( $hour + 1))

I like to calculate with the variable $hour, which I obtain with the sed command. When I print $hour out with 'echo' '300.1109' appear on the screen. However, if I want to calculate with this variable I reseive an error. Do you know, what the reason for this is? I thought there were no variable types in Linux shell....

Cheers

[fct]

The shell works with integers, no floating point arithmetic.

You can use "bc" though:

z2=`echo $hour + 1 |bc`