What is unix command?
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Can you explain a little bit about command substitution?
What does 'mkdir' command do in UNIX?
Give Command that will change the name of a directly from paypal to eBay
Describe the zip/unzip command using gzip.
The rm command removes links to file. What does this mean? How then is a file deleted from the file system?
What Is the command to change a file's creation time. means one file is created at the time 15:19 then time should br changed to 14:14
Is there any method to erase all files in the current directory, along with its all sub-directories, by using only one command?
How does the user view the contents of a text file in UNIX?
Explain the terms ‘system calls’ and ‘library functions’ with respect to unix commands?
What is a command and examples?
boot process?
Write a grep (or grep) command that selects the lines from a file that have exactly three characters.
Unix Commands 
