Warming up with Unix commands - Revision history

Daniele Varsano: /* More commands */

2020-11-25T15:43:33Z

More commands

← Older revision		Revision as of 15:43, 25 November 2020
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	$> tar -xvf file.tar		$> tar -xvf file.tar
	$> tar -~~cvfz~~ file.tgz		$> tar -xvfz file.tgz

Andrea Ferretti: /* Creating and editing text files */

2020-11-25T15:35:43Z

Creating and editing text files

← Older revision		Revision as of 15:35, 25 November 2020
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	evince ./LabQSM/docs/vi_cheat_sheet.pdf		evince ./LabQSM/docs/vi_cheat_sheet.pdf

	Let's create a text file named atp.txt with the following content:		Let's create a text file named <code>atp.txt</code> with the following content:

	9850 Nadal		9850 Nadal

Daniele Varsano: /* Environment */

2020-11-25T15:17:05Z

Environment

← Older revision		Revision as of 15:17, 25 November 2020
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	$> var="$HOME"		$> var="$HOME"
	$> echo $var -> /~~HOME~~/~~labcqm~~		$> echo $var -> /home/max
	$> var='$HOME'		$> var='$HOME'
	$> echo $var -> "$HOME"		$> echo $var -> "$HOME"

Andrea Ferretti: /* Processes */

2020-11-25T14:57:26Z

Processes

← Older revision		Revision as of 14:57, 25 November 2020
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	$> kill [-9] <pid> # <pid> is the process id as given by ps		$> kill [-9] <pid> # <pid> is the process id as given by ps

	Processes that are launched interactively can be ~~stopped~~ by typing		Processes that are launched interactively can be killed or interrupted by typing

	$> ctrl+z		$> ctrl+c # kills the process
			$> ctrl+z # suspect the process

	~~and~~ can be sent in background or foreground by using <code>bg</code> and <code>fg</code>		In the latter case, the process can be sent in background or foreground by using <code>bg</code> and <code>fg</code>

	===Exercise===		===Exercise===

Andrea Ferretti: /* Creating, removing, copying, and moving files and directories */

2020-11-25T14:49:24Z

Creating, removing, copying, and moving files and directories

← Older revision		Revision as of 14:49, 25 November 2020
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	$> cp filename ./LabQSM/newname #copy the file in the LabQSM directory with a new name		$> cp filename ./LabQSM/newname #copy the file in the LabQSM directory with a new name
	$> cp -r dirname ./LabQSM/ #copy the directory dirname and all its content in the LabQSM directory		$> cp -r dirname ./LabQSM/ #copy the directory dirname and all its content in the LabQSM directory
			$> cp -a dirname ./LabQSM/ # as above, but considering the folder as an archive (keeps some extra features like symbolic links)

			As mentioned above, instead of copying physically a file or a folder from one location to another, one can create symbolic links (basically filesystem aliases):
			$> mkdir TMP ; cd TMP
			$> ln -s ../LabQSM/pseudo ./ # makes a link copy of the pseudo dir in the current directory

	In all cases, when the possibility of losing information exists, a confirmation is asked to the user (who has to provide a y/n answer).		In all cases, when the possibility of losing information exists, a confirmation is asked to the user (who has to provide a y/n answer).

Andrea Ferretti at 10:42, 25 November 2020

2020-11-25T10:42:57Z

← Older revision		Revision as of 10:42, 25 November 2020
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	* Prev: [[LabQSM#Getting Started]]		* Prev: [[LabQSM#Getting Started]]
	* Next: [[~~Bash scripting~~]]		* Next: [[Scripting]]

Daniele Varsano: /* Creating and editing text files */

2020-11-25T10:37:32Z

Creating and editing text files

← Older revision		Revision as of 10:37, 25 November 2020
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	$> sort -n atp.txt # sort the file according to its numerical value		$> sort -n atp.txt # sort the file according to its numerical value
	$> sort -nr atp.txt # sort the file according to its numerical value in reverse order		$> sort -nr atp.txt # sort the file according to its numerical value in reverse order
	$> sort -k2 atp.txt. # sort column 2		$> sort -k2 atp.txt # sort column 2

	Search for contents: <code>grep</code>:		Search for contents: <code>grep</code>:

Daniele Varsano: /* Combining commands */

2020-11-25T10:34:41Z

Combining commands

← Older revision		Revision as of 10:34, 25 November 2020
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	A very powerful feature of unix commands is that their input and output can be redirected using the operators <, >, >>.		A very powerful feature of unix commands is that their input and output can be redirected using the operators <, >, >>.
			[[File:Redirect.png\|thumb]]

	$> echo "Hello world" > greetings.txt # output of echo redirected to file		$> echo "Hello world" > greetings.txt # output of echo redirected to file

Andrea Ferretti: /* Getting Stearted */

2020-11-25T10:31:41Z

Getting Stearted

← Older revision		Revision as of 10:31, 25 November 2020
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	[[File:EHJdV6vWwAgcT-b.jpg\|none\|500px\|top\|]]		[[File:EHJdV6vWwAgcT-b.jpg\|none\|500px\|top\|]]
	==~~Getting Stearted~~==
			* Prev: [[LabQSM#Getting Started]]
			* Next: [[Bash scripting]]


			==Intro==

	[[File:Operating system.png\|thumb\|150px\|left]]		[[File:Operating system.png\|thumb\|150px\|left]]
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	[[File:Operating system.png\|thumb\|100px\|left]]		[[File:Operating system.png\|thumb\|100px\|left]]
	-->		-->

	* Prev: [[LabQSM#Getting Started]]
	* Next: [[Bash scripting]]

	In this lesson, you will learn some basic commands of the [https://en.wikipedia.org/wiki/Unix Unix] operative system. The operating system (OS) is the system software that manages computer hardware, software resources, and provides common services for computer programs, e.g. allowing for the communication between hardware and software.		In this lesson, you will learn some basic commands of the [https://en.wikipedia.org/wiki/Unix Unix] operative system. The operating system (OS) is the system software that manages computer hardware, software resources, and provides common services for computer programs, e.g. allowing for the communication between hardware and software.
	In order to use a computer, you need an OS. At this moment you may be using a Virtual Machine containing the Ubuntu OS, a [https://en.wikipedia.org/wiki/Linux Linux] distribution, a Unix-like OS. The basic commands used in Linux and Unix are essentially the same.		In order to use a computer, you need an OS. At this moment you may be using a Virtual Machine containing the Ubuntu OS, a [https://en.wikipedia.org/wiki/Linux Linux] distribution, a Unix-like OS. The basic commands used in Linux and Unix are essentially the same.

Andrea Ferretti at 10:30, 25 November 2020

2020-11-25T10:30:47Z

← Older revision		Revision as of 10:30, 25 November 2020
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	[[File:Operating system.png\|thumb\|100px\|left]]		[[File:Operating system.png\|thumb\|100px\|left]]
	-->		-->

			* Prev: [[LabQSM#Getting Started]]
			* Next: [[Bash scripting]]

	In this lesson, you will learn some basic commands of the [https://en.wikipedia.org/wiki/Unix Unix] operative system. The operating system (OS) is the system software that manages computer hardware, software resources, and provides common services for computer programs, e.g. allowing for the communication between hardware and software.		In this lesson, you will learn some basic commands of the [https://en.wikipedia.org/wiki/Unix Unix] operative system. The operating system (OS) is the system software that manages computer hardware, software resources, and provides common services for computer programs, e.g. allowing for the communication between hardware and software.