将标准输出与标准错误输出的文件描述符路径调换：
[root@station ~]# adfasdf | cat
-bash: adfasdf: command not found
[root@station ~]# adfasdf | cat > 123.txt
-bash: adfasdf: command not found
[root@station ~]# cat 123.txt
[root@station ~]# adfasdf 3>&1 1>&2 2>&3- | cat > 123.txt
[root@station ~]# cat 123.txt
-bash: adfasdf: command not found
[root@station ~]#
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