while loop read file problem

[___紸角...]

HI:

one way:

#!/usr/bin/bash

a=0

FILE="myfile.txt"

cat $FILE | while read line

do

a=$(($a+1))

echo $a

#done < $FILE

done

echo "Final line count is: $a‍

two way:

#!/usr/bin/bash

a=0

FILE="myfile.txt"

 while read line

do

a=$(($a+1))

echo $a

done < $FILE

echo "Final line count is: $a"‍

On the one way: the variable $a  in while loop is not useful. The two way excute result is not equal

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                                                               谢谢！     

                                                       崔志良