在Linux中，要使用命令“chmod-R xxx/home/abc"修改目录/home/abc的访问权限为可读、可写、可执行，命令中的“xxx”应该是（ ）。
- A.777
- B.555
- C.444
- D.222
正确答案及解析
正确答案
解析
本题也是Linux系统中关于文件权限的常用命令，Linux系统的权限可以用读写和执行分别表示。既可以表示成字符型也可以表示成数字型。有读权限时对应的数值型是4，有写权限时对应的数值是2，有执行权限对应的数值是1.chmod中的数字形式表示权限，可以将读写执行对应的值相加即可表示。如果要表示某个用户具有读写执行的权限，这个对应的权限数值为4+2+1=7. Chmod 777 通常表示文件所有者，与文件所有者同组的用户，其他用户都具有读写执行的权限。
包含此试题的试卷
你可能感兴趣的试题
Advancements in （ ）have contributed to the growth of the automotive industry through the creation and evolution of self-driving vehicles.
-
- A.Artificial Intelligence
- B.Cloud Computing
- C.Internet of Things
- D.Big Data
- 查看答案
In project human resource management , （ ）is not a source of power for the project manager.
-
- A.referent power
- B.expert power
- C.reward power
- D.audit power
- 查看答案
At the project establishment stage , the feasibility study mainly includes techinical feasibility analysis , （ ）, operation environment feasibility analysis and other aspects of feasibility analysis.
-
- A.detail feasibility analysis
- B.opportunity analysis
- C.economic feasibility analysis
- D.risk analysis
- 查看答案
（ ）is a grid that shows the project resources assigned to each work package.
-
- A.Stakeholder engagement assessment matrix
- B.Requirements traceability matrix
- C.Probability and impact matrix
- D.Responsibility assignment matrix
- 查看答案
Xinhua News Agency reported in January 2022，Chian will further promote the developmet of a digital economy during the 14th Five-Year Plan eriod（2021-2025）. The plan also emphasized industrial （ ）transformation.
-
- A.digital
- B.networking
- C.intelligentize
- D.informatization
- 查看答案