仅在存在差异时通过电子邮件发送两个文件之间的差异输出

Question

如何通过电子邮件发送file1和file2之间的输出，但仅限于存在差异？可以说我正在使用shell脚本。

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

Answer 1

使用||串联。

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

更多信息here

Answer 2

我能够在网上找到它，效果很好

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