Operating Systems 2026F: Tutorial 1 - Revision history

Soma at 18:38, 14 September 2026

2026-09-14T18:38:38Z

← Older revision		Revision as of 18:38, 14 September 2026
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	~~'''THIS TUTORIAL IS NOT YET FINALIZED.'''~~

	In this tutorial you will be learning the basics of command-line interaction in Linux.		In this tutorial you will be learning the basics of command-line interaction in Linux.

Soma at 17:56, 14 September 2026

2026-09-14T17:56:04Z

← Older revision		Revision as of 17:56, 14 September 2026
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	'''THIS TUTORIAL IS ~~STILL IN DEVELOPMENT~~.'''		'''THIS TUTORIAL IS NOT YET FINALIZED.'''

	In this tutorial you will be learning the basics of command-line interaction in Linux.		In this tutorial you will be learning the basics of command-line interaction in Linux.

Soma: /* Tasks/Questions */

2026-09-14T17:43:49Z

Tasks/Questions

← Older revision		Revision as of 17:43, 14 September 2026
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	</pre>		</pre>
	</li>		</li>
	<li>Run the following command. What is the value of $x afterwards? What if you interrupt it in the middle, what is the value of $x? How does this differ from the answer to Question 7?		<li>Run the following command. What is the value of $x afterwards? What if you interrupt it in the middle, what is the value of $x? How does this differ from the answer to Question 8?
	<pre>		<pre>
	(for x in 1 2 3 4 5 6 7 8 9 10; do echo $x; sleep 1; done)		(for x in 1 2 3 4 5 6 7 8 9 10; do echo $x; sleep 1; done)

Soma: /* Tasks/Questions */

2026-09-14T17:43:29Z

Tasks/Questions

← Older revision		Revision as of 17:43, 14 September 2026
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	<li>Can you find any files where the size is zero but the file clearly contains data? What filesystem(s) contain such files?<li>		<li>Can you find any files where the size is zero but the file clearly contains data? What filesystem(s) contain such files?<li>
	<li>What is the PATH environment variable for?</li>		<li>What is the PATH environment variable for?</li>
			<li>When you run the <tt>nano</tt> command, something weird happens the first time but not subsequently. What is happening on first execution? Why?
	<li>When you have logged in to a shell, how (i.e., using what commands?) do you first find out information about the environment?		<li>When you have logged in to a shell, how (i.e., using what commands?) do you first find out information about the environment?
	<ol style="list-style-type:lower-alpha">		<ol style="list-style-type:lower-alpha">

Soma: /* Tasks/Questions */

2026-09-14T17:41:00Z

Tasks/Questions

← Older revision		Revision as of 17:41, 14 September 2026
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	sh		sh
	</pre>		</pre>
	<li>		</li>
			<li>What happens if you add the following to the start or end of your shell script?
			<pre>
			export x
			</pre>
			</li>
	</ol>		</ol>

Soma: /* Tasks/Questions */

2026-09-14T17:37:21Z

Tasks/Questions

← Older revision		Revision as of 17:37, 14 September 2026
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	<ol>		<ol>
	<li>Can you find any files where the size is zero but the file clearly contains data? What filesystem(s) contain such files?<li>		<li>Can you find any files where the size is zero but the file clearly contains data? What filesystem(s) contain such files?<li>
			<li>What is the PATH environment variable for?</li>
	<li>When you have logged in to a shell, how (i.e., using what commands?) do you first find out information about the environment?		<li>When you have logged in to a shell, how (i.e., using what commands?) do you first find out information about the environment?
	<ol style="list-style-type:lower-alpha">		<ol style="list-style-type:lower-alpha">
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	</pre>		</pre>
	</li>		</li>
	<li>Run the following command. What is the value of $x afterwards? What if you interrupt it in the middle, what is the value of $x? How does this differ from the answer to Question 6?		<li>Run the following command. What is the value of $x afterwards? What if you interrupt it in the middle, what is the value of $x? How does this differ from the answer to Question 7?
	<pre>		<pre>
	(for x in 1 2 3 4 5 6 7 8 9 10; do echo $x; sleep 1; done)		(for x in 1 2 3 4 5 6 7 8 9 10; do echo $x; sleep 1; done)
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	<li>Can you make a command that outputs the numbers 1 through 10, delaying for a second in between, using the shell command language? Your program shouldn't be written on just one line!		<li>Can you make a command that outputs the numbers 1 through 10, delaying for a second in between, using the shell command language? Your program shouldn't be written on just one line!
	(Programs written in the shell language are known as shell scripts. Are there any other commands on the system that are actually shell scripts?)</li>		(Programs written in the shell language are known as shell scripts. Are there any other commands on the system that are actually shell scripts?)</li>
			<li>What happens if you add the following command as the last line of your shell script from the previous question? How does that change the value of $x?
			<pre>
			sh
			</pre>
			<li>
	</ol>		</ol>

Soma: /* Tasks/Questions */

2026-09-14T17:32:34Z

Tasks/Questions

← Older revision		Revision as of 17:32, 14 September 2026
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	<ol>		<ol>
			<li>Can you find any files where the size is zero but the file clearly contains data? What filesystem(s) contain such files?<li>
	<li>When you have logged in to a shell, how (i.e., using what commands?) do you first find out information about the environment?		<li>When you have logged in to a shell, how (i.e., using what commands?) do you first find out information about the environment?
	<ol style="list-style-type:lower-alpha">		<ol style="list-style-type:lower-alpha">
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	</pre>		</pre>
	</li>		</li>
	<li>Run the following command. What is the value of $x afterwards? What if you interrupt it in the middle, what is the value of $x? How does this differ from the answer to Question 5?		<li>Run the following command. What is the value of $x afterwards? What if you interrupt it in the middle, what is the value of $x? How does this differ from the answer to Question 6?
	<pre>		<pre>
	(for x in 1 2 3 4 5 6 7 8 9 10; do echo $x; sleep 1; done)		(for x in 1 2 3 4 5 6 7 8 9 10; do echo $x; sleep 1; done)

Soma: /* Tasks/Questions */

2026-09-14T17:31:15Z

Tasks/Questions

← Older revision		Revision as of 17:31, 14 September 2026
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	</pre>		</pre>
	</li>		</li>
	<li>Can you make a command that outputs the numbers 1 through 10, delaying for a second in between, using the shell command language? Your program shouldn't be written on just one line!(Programs written in the shell language are known as shell scripts. Are there any other commands on the system that are actually shell scripts?)</li>		<li>Can you make a command that outputs the numbers 1 through 10, delaying for a second in between, using the shell command language? Your program shouldn't be written on just one line!
			(Programs written in the shell language are known as shell scripts. Are there any other commands on the system that are actually shell scripts?)</li>
	</ol>		</ol>

Soma: /* Tasks/Questions */

2026-09-14T17:31:03Z

Tasks/Questions

← Older revision		Revision as of 17:31, 14 September 2026
Line 153:		Line 153:
	</pre>		</pre>
	</li>		</li>
	<li>Can you make a command that outputs the numbers 1 through 10, delaying for a second in between, using the shell command language? Programs written in the shell language are known as shell scripts. Are there any other commands on the system that are actually shell scripts?</li>		<li>Can you make a command that outputs the numbers 1 through 10, delaying for a second in between, using the shell command language? Your program shouldn't be written on just one line!(Programs written in the shell language are known as shell scripts. Are there any other commands on the system that are actually shell scripts?)</li>
	</ol>		</ol>

Soma: /* Tasks/Questions */

2026-09-14T17:29:49Z

Tasks/Questions

← Older revision		Revision as of 17:29, 14 September 2026
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	</pre>		</pre>
	</li>		</li>
			<li>Run the following command. How does the behaviour of this command differ from previous commands? How can you stop the command from running? And what is the value of $x, at the end of the command and while it is running?
			<pre>
			(for x in 1 2 3 4 5 6 7 8 9 10; do echo $x; sleep 1; done) &
			</pre>
			</li>
			<li>Can you make a command that outputs the numbers 1 through 10, delaying for a second in between, using the shell command language? Programs written in the shell language are known as shell scripts. Are there any other commands on the system that are actually shell scripts?</li>
	</ol>		</ol>