What is the difference between a hard link and a symbolic link in Unix? How do you find out the system's IP address in Unix? What is the function of the chmod command in Unix? Explain the difference between grep and egrep. How do you check the disk usage on a Unix system?

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Unix related questions for Senior Software Engineer interview

A hard link is a direct link to the physical file on disk, while a symbolic link is a reference to the file by name.
To find out the system's IP address in Unix, you can use commands like ifconfig or ip addr show.
The chmod command in Unix is used to change the permissions of a file or directory.
grep is used for searching text using regular expressions, while egrep is an extended version of grep with more powerful pattern matching capabilities.
To check disk usage on a Unix system, you can use the df command to display disk space usage.

What is the difference between a hard link and a symbolic link in Unix? How do you find out the system's IP address in Unix? What is the function of the chmod command in Unix? Explain the difference between grep and egrep. How do you check the disk usage on a Unix system?

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