Sorting 3 columns and getting the average

Question

when I run my testing.sh file

#!/bin/bash
FILE=$1
COUNT=0
while read -r SID FIRST LAST S1 S2 S3 
do
    SUM=$(expr $S1 + $S2 + $S3)
    AVG=$(expr $SUM / 3)
             


        

Answer 1

Your S3 does not actually contain a value such as 90, but instead contains values such as 90$'\r', because your input file has CRLF (DOS) rather than LF (UNIX) newlines. This most often happens if you got your input file from a non-UNIX system.

Fix the file, using tools such as dos2unix or the vim command :set fileformat=unix, or use code akin to the following in your script:

S3=${S3%$'\r'} # remove any trailing $'\r' from S3