bash - 如何在 bash 脚本中标记 std 输出

Question

我有一个如下所示的基本脚本:

#!/bin/bash
### run these 2 commands and dump the contents to a file
run command 1 > /dir/file1
run command 2 > /dir/file2

##### run this command, echo the output and email me if $var is above a certain # and send the contents of the dump files in the email
var=$(netstat -an | wc -l)
echo $var
if [ "$var" -ge 700 ]; then
cat /dir/file1 /dir/file2 | mailx -s "System X has over $var connections. "    email recipients
fi

我需要做的是标记内容以区分这两个文件，这样当我收到电子邮件时，我就知道命令 1 的输出和命令 2 的输出是什么。执行此操作的最佳方法是什么？

Answer 1

您可以滥用head:

$ cat file1
Contents of file 1
$ cat file2
Contents of file 2
$ head -n -0 file*                                                                                                                                                                                                                   
==> file1 <==
Contents of file 1

==> file2 <==
Contents of file 2