#!/bin/sh
BUFIFS=$IFS
IFS=
i=0
while read  line
do
i=`expr $i + 1`
echo $i":"$line
done <list.txt
IFS=$BUFIFS
#-------------
BUFIFS=$IFS
IFS=,
i=0
while read line
do
i=`expr $i + 1`
if [ $i -eq 2 ]
then echo $i":"$line
fi
done <list.txt
IFS=$BUFIFS
#-------------


=======================================
$ cat list.txt
taro,male,1980-05-06,O
hanako,female,1982-03-14,A
hiroshi,male,1981-06-17,AB
emi,female,1982-12-03,B

=====================================
$ source read_eachLine.sh
1:taro,male,1980-05-06,O
2:hanako,female,1982-03-14,A
3:hiroshi,male,1981-06-17,AB
4:emi,female,1982-12-03,B
5:
2:hanako female 1982-03-14 A