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linux学习命令总结⑨

2024-07-18 01:18:01   222人阅读

#重定向

输出重定向：

1>覆盖输出(1可省略)

[root@VM_168_102_centos tmp]# ls functions >shuchu
[root@VM_168_102_centos tmp]# cat shuchu 
functions
[root@VM_168_102_centos tmp]# ls fstab >shuchu
[root@VM_168_102_centos tmp]# cat shuchu 
fstab

1>>追加输出(1可省略)

[root@VM_168_102_centos tmp]# cat shuchu 
fstab
[root@VM_168_102_centos tmp]# ls functions >>shuchu
[root@VM_168_102_centos tmp]# cat shuchu 
fstab
functions

错误重定向:

2>：覆盖输出

[root@VM_168_102_centos tmp]# ls 
agent_cmd.sock  fstab      hellodirxyz  scripttest  test
ceshi           functions  rc.sysinit   shuchu
[root@VM_168_102_centos tmp]# ls fstab wanghan >shuchu
ls: cannot access wanghan: No such file or directory
[root@VM_168_102_centos tmp]# cat shuchu 
fstab
[root@VM_168_102_centos tmp]# ls fstab wanghan 2>shuchu
fstab
[root@VM_168_102_centos tmp]# cat shuchu 
ls: cannot access wanghan: No such file or directory

2>>：追加输出

[root@VM_168_102_centos tmp]# cat shuchu               
ls: cannot access wanghan: No such file or directory
[root@VM_168_102_centos tmp]# ls ssssdd wanghan 2>>shuchu
[root@VM_168_102_centos tmp]# cat shuchu 
ls: cannot access wanghan: No such file or directory
ls: cannot access ssssdd: No such file or directory
ls: cannot access wanghan: No such file or directory

同时重定标准输出和错误输出：

[root@VM_168_102_centos tmp]# ls fstab wanghan >shuchu 2>cuowu[root@VM_168_102_centos tmp]# cat shuchu 
fstab
[root@VM_168_102_centos tmp]# cat cuowu 
ls: cannot access wanghan: No such file or directory
[root@VM_168_102_centos tmp]# ls fstab wanghan &>all       
[root@VM_168_102_centos tmp]# cat all
ls: cannot access wanghan: No such file or directory
fstab
[root@VM_168_102_centos tmp]# ls fstab wanghan >both 2>&1
[root@VM_168_102_centos tmp]# cat both 
ls: cannot access wanghan: No such file or directory
fstab


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