快到了，试试这个：

while read line; do echo -n $line|md5; done < 123.txt

除非你也想在哈希每行换行字符，你应该包括-n选项。

Unless you also want to hash the newline character in every line you should include the '-n' option.

在一个脚本：

#!/bin/bash
while read line; do echo -n $line|md5; done < $1