shell read line

 

cat >b <<EOF
line1
line2
line3
EOF

 

# 方法1
while read line
do
    echo ${line}
done < <(cat b)

 

# 方法2
cat b|while read line
do
    echo ${line}
done

 

# 方法3
while read line
do
    echo ${line}
done < b