Linux Learning Commands Summary ⑨

#重定向

Output redirection:

1> Overlay Output (1 can be omitted)

[[Email Protected]_168_102_centos tmp]# ls functions >>shuchu[[email protected]_168_102_centos tmp ]# Cat Shuchu Fstab

1>> Append output (1 can be omitted)

>>shuchu[[email protected]_168_102_centos tmp]# cat Shuchu fstabfunctions

Error redirection:

2>: Overwrite output

[email protected]_168_102_centos tmp]# ls agent_cmd.sock  fstab      hellodirxyz  scripttest  Testceshi           functions  rc.sysinit   >2>shuchufstab[[email protected]_168_102_ CentOS tmp]# cat Shuchu ls:cannot access wanghan:no such file or directory

2>>: Append output

[email protected]_168_102_centos tmp]# cat Shuchu                2>>shuchu[[email protected]_168_102_centos tmp]# cat Shuchu ls:cannot access wanghan:no such file or directory Ls:cannot access ssssdd:no Such file or directoryls:cannot access wanghan:no such file or directory

the standard output and error output are also re-determined :

[[Email protected]_168_102_centos tmp]# ls fstab wanghan >shuchu 2>cuowu[[email protected]_168_102_centos tmp ]# cat Shuchu fstab[[email protected]_168_102_centos tmp]# cat Cuowu ls:cannot access wanghan:no such file or directory< /c4>

[[Email protected]_168_102_centos tmp]# ls fstab wanghan &>all       [email Protected]_168_102_centos tmp]# Cat Allls:cannot Access wanghan:no such file or Directoryfstab

[Email protected]_168_102_centos tmp]# ls fstab wanghan >both 2>&1[email protected]_168_102_centos tmp] # cat Both Ls:cannot access wanghan:no such file or Directoryfstab