如何在 bash 脚本中将 STDOUT 发送到一个文件，将 STDOUT+STDERR 发送到另一个文件

Question

我想写一个 bash shell 脚本，将 STDOUT 重定向到文件 "result.log"，STDERR+STDOUT 重定向到文件 "complete.log。最好是第三个文件，只有 STDERR suc 作为"错误.log。最后向终端显示标准输出

Linux mint 19.1

#!/bin/bash
exec  > >(tee -a result.log full.log) 
exec 2>>full.log 
echo "This is stdout" 
echo "This is stderr" >&2 
echo "This is stdout 2" 
echo "This is stderr 2" >&2 
echo "This is stdout 3" 
echo "This is stderr 3" >&2 
echo "This is stdout 4" 
echo "This is stderr 4" >&2 

输出

full.log:This is stderr 
full.log:This is stderr 2
full.log:This is stderr 3 
full.log:This is stderr 4
full.log:This is stdout
full.log:This is stdout 2
full.log:This is stdout 3
full.log:This is stdout 4
result.log:This is stdout
result.log:This is stdout 2
result.log:This is stdout 3
result.log:This is stdout 4

预期

full.log:This is stdout
full.log:This is stderr
full.log:This is stdout 2
full.log:This is stderr 2
full.log:This is stdout 3
full.log:This is stderr 3
full.log:This is stdout 4
full.log:This is stderr 4
result.log:This is stdout
result.log:This is stdout 2
result.log:This is stdout 3
result.log:This is stdout 4

Answer 1

试试这个方式：

exec 1> >(tee -a result.log >>full.log)
exec 2>>full.log

但请考虑一下，full.log 中的输出排序现在是：

This is stderr
This is stderr 2
This is stderr 3
This is stderr 4
This is stdout
This is stdout 2
This is stdout 3
This is stdout 4

Answer 2

以下解决方案仅在 bash 支持 /dev/fd/NUM 时才有效。它使输出保持有序。

#!/bin/bash
exec 1>>result.log 2>>full.log
echo "This is stdout"   | tee -a /dev/fd/2
echo "This is stderr"   >&2 
echo "This is stdout 2" | tee -a /dev/fd/2
echo "This is stderr 2" >&2 
echo "This is stdout 3" | tee -a /dev/fd/2
echo "This is stderr 3" >&2 
echo "This is stdout 4" | tee -a /dev/fd/2
echo "This is stderr 4" >&2