Shell Programming and Scripting

Let XOFFS = (10 20 30 40 50)

If VDISTMIN = -20 and VDISTMAX = 20
Then ISTR = 1 and IEND = 2 as XOFFS[1] through XOFFS[2] fall within the two distances VDISTMIN and VDISTMAX.

If VDISTMIN = 20 and VDISTMAX = 80
Then ISTR = 2 and IEND = 5 as XOFFS[2] through XOFFS[5] fall within the two distances VDISTMIN and VDISTMAX.

$ cat ans
#!/bin/bash
XOFFS=( 10 20 30 40 50 )
VDISTMIN=$1
VDISTMAX=$2
ISTR=1
IEND=${#XOFFS[@]}
i=0
while [ $i -lt ${#XOFFS[@]} ]
do
   [ ${XOFFS[i]} -le $VDISTMIN ] && let ISTR=$i+1
   [ ${XOFFS[i]} -le $VDISTMAX ] && let IEND=$i+1
   let i=i+1
done
echo "For $VDISTMIN to $VDISTMAX" ISTR=$ISTR IEND=$IEND
 
$ ./ans -20 20
For -20 to 20 ISTR=1 IEND=2
 
$ ./ans 20 80
For 20 to 80 ISTR=2 IEND=5