仅在两个文件之间发生差异时才发送差异输出

Question

如何通过电子邮件将文件1和文件2之间的输出通过电子邮件发送，但前提是两者之间存在差异？可以说我正在使用shell脚本。

diff file1 file2 | mail -s "subject" "email@email.com" 

Answer 1

使用||级联。

diff -q file1 file2 || diff file1 file2 | mail -s "subject" "email@email.com" 

更多信息here

Answer 2

我能找到这个网络，它的工作很大

command > file 
if [ -s file ] 
then 
    mailx -s "Subject" mailaddress <file.tmp 
fi 
rm file