Unix 面试题与答案
相关差异对比
问题 16. How does the kernel differentiate device files and ordinary files?
Kernel checks 'type' field in the file's inode structure.
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问题 17. How to switch to a super user status to gain privileges?
Use 'su' command. The system asks for password and when valid entry is made the user gains super user (admin) privileges.
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问题 18. What are shell variables?
Shell variables are special variables, a name-value pair created and maintained by the shell.
Example: PATH, HOME, MAIL and TERM
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问题 19. What is redirection?
</SPAN>
Directing the flow of data to the file or from the file for input or output.
Example : ls > wc
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问题 20. How to terminate a process which is running and the specialty on command kill 0?
With the help of kill command we can terminate the process.
Syntax: kill pid
Kill 0 - kills all processes in your system except the login shell.
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用户评价最有帮助的内容：
- How are devices represented in UNIX?
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- What difference between cmp and diff commands?
- Explain the steps that a shell follows while processing a command.
- Brief about the directory representation in UNIX