``` tony@tony-B460MAORUSELITE:~$ ls 1.txt Desktop Downloads ops-documents Public snap test 2.conf Documents Music Pictures scripts Templates Videos tony@tony-B460MAORUSELITE:~$ ls 1.txt 1>test tony@tony-B460MAORUSELITE:~$ cat test 1.txt tony@tony-B460MAORUSELITE:~$ ls 1.txt 2>test 1.txt tony@tony-B460MAORUSELITE:~$ ls 2.txt 1>test ls: 无法访问 '2.txt': 没有那个文件或目录 tony@tony-B460MAORUSELITE:~$ ls 2.txt 2>test tony@tony-B460MAORUSELITE:~$ cat test ls: 无法访问 '2.txt': 没有那个文件或目录 ------------------------------------------ # 正确和错误输出都重定向 tony@tony-B460MAORUSELITE:~$ ls 1.txt &> test tony@tony-B460MAORUSELITE:~$ cat test 1.txt tony@tony-B460MAORUSELITE:~$ ls 2.txt &> test tony@tony-B460MAORUSELITE:~$ cat test ls: 无法访问 '2.txt': 没有那个文件或目录 ```