View source for bash arithmetic


== using let ==

 let "TOTAL = ( $A + 5 ) / $b"


== floating point using bc ==

 TOTAL=`echo "( $A + 5 ) / $b" | bc -l

'''using scale to control number of digits'''

 $ echo "1 / 100" | bc -l 
 .01000000000000000000
 
 $ echo "scale =2; 1 / 100" | bc -l                                                                        ~
 .01


using expr
 a=`expr $a + 1`

 a=`expr 5 + 3`

[[category:bash]]