#!/bin/bash
while read line
do
      echo $line     #這里可根據實際用途變化
done < urfile

#!/bin/bash
cat urfile | while read line
do
    echo $line
done

var1=$(grep -i "^root" /etc/passwd | cut -d: -f 3 2>/dev/null)   <=讀取/etc/passwd文件中root的id

while read wOne wTwo wThree
do
    [ -z $wOne ] && continue           #測試此行內容是否為空
    xxx=$wOne                                 #提取內容
done < /var/xxx/one.txt
echo "$xxx"                                    #變量獲取了文件中的內容

cat /var/xxx/one.txt | while read wOne wTwo wThree
do
    [ -z $wOne ] && continue           #測試此行內容是否為空
    xxx=$wOne                                 #提取內容
done
echo "$xxx"                                    #這里變量內容沒有改變