Write down a Unix command that will add the contents of a file named file1.txt and a file named file2.txt onto theend of a file named file3.txt.

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A: Here are the commands that you asked...

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A: Required:

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A: The problem is based on the basics of file manipulations in bash.

Q: crontab file

A: Cron job :- is used to schedule and execute a job at a specific time. its format is as follows:-

Q: Write a python program that print out all lines in a file that contains the substring.

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Q: .Create a directory called dir1

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Q: Write down a Unix command that will update the security permissions on a file named file1.txt such…

A: The solution to the given problem is below.

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Q: Which of the following commands or sequences of commands will rename a file x to file y in a Unix…

A: Answer the above question are as follows

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A: If we are in same directory as of executable we can use "./" to mention that,  and then we can give…

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A: Below are all the commands:

Q: ectory on a UNIX system, only if the file name (not including the extension) begins and ends with a…

A: Dear Student, The answer to your question is given below -

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A: We can use for statement in shell script to accomplish this.

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A: Answer

Q: Issue a single Linux command to display all lines of text in the file ~/text.txt that begins with a…

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A: The code for the above-given question is given below:

Q: Unix

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A: Answer: I have given answer in the brief explanation.

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A: Answer:

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A: The solution is given in the below step with explaantion

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Linux

An operating system (OS) is the software which manages hardware and resources, like CPU, storage and memory. The OS bridges the applications and hardware and makes the connections between all of your software and the hardware resources.