scripts help

[Kenn Chen]

i would like to do monipulation of my script.

eg. count=5
line_count= count - 3
but failed why ??

[Jdamian · Accepted solution]

Arithmetic expressions can be used in a script by means of double brackets pair
$(( ??? )) pair

For example:

COUNT=3
OTHER=$(($COUNT - 1))

[Bill McNAMARA_1]

count=5
val= expr $count - 3
echo $val

The val is taken as a string not as an int.

Later,
Bill

[Magdi KAMAL]

Hi Idris,

val1=5
Val1=`expr $val1 - 2`

Do not forget back quotes for command evaluation.

Magdi