#!/bin/bash

### 一行顯示
### ls -l /usr/ |awk '/^d/ {print $NF}'

# ### 顯示目前的 目錄
# for dir in $(ls `pwd`/)
# do
#  #echo "123"
#  echo $dir
#  #[ -d $dir ] && echo $dir
# done


## 方法C
# while read line
# do
#     echo $line
# done < file\("$1"\)
## 方法A
# for line in `cat file(待讀取的檔案)`
# do
#     echo $line

# done
## 方法B

# cat file($1) | while read line
# do
#     echo $line
# done


filename="$1"
while IFS='' read -r line || [[ -n "$line" ]]; do
    echo "a $line" # 一行一行印出內容，前面加上 a
done < $filename