Useful Linux commands - Revision history

Tdjones22: Added examples for -l and -L flags in grep command

2025-12-21T22:24:59Z

Added examples for -l and -L flags in grep command

@@ Line 937: / Line 937: @@
 tdjones22@bowie:~/grep_test$ grep -i -c "python" test2.txt
 </pre>
    </blockquote>

Tdjones22: Added examples for -c flag for grep

2025-12-21T21:30:28Z

Added examples for -c flag for grep

@@ Line 912: / Line 912: @@
 :pythons
 :python
 </pre>
    </blockquote>

Tdjones22: Added examples for -e and -E flags for grep

2025-12-19T23:28:26Z

Added examples for -e and -E flags for grep

@@ Line 877: / Line 877: @@
 more_more_code.c
 some_code.py
 </pre>
    </blockquote>

Tdjones22: Added examples for -v flag in grep command

2025-12-17T21:01:20Z

Added examples for -v flag in grep command

@@ Line 830: / Line 830: @@
 :Pythons
 :pythons
 </pre>
    </blockquote>

Tdjones22: Added i and w flags for grep

2025-12-01T19:15:37Z

Added i and w flags for grep

@@ Line 777: / Line 777: @@
 :Pythons kill prey by squeezing them really tight.
 :Pythons incubate their eggs by shivering.
 </pre>
    </blockquote>

Tdjones22: Started grep command

2025-10-07T13:54:15Z

Started grep command

← Older revision		Revision as of 13:54, 7 October 2025
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	=== grep ===		=== grep ===

			<code>grep</code> is a tool used to match words, strings, or patterns in text files. The command works with any <code>ASCII Text</code> files, so extensions like .txt, .c, .py, .log, .config, etc all work with <code>grep</code>.

			* <code>grep "<desired text>" <file></code> - Using <code>grep</code> to find something in a file will output ''all'' lines that contain a case-sensitive match. Here's the output if I run <code>grep "Python" test2.txt</code>:
			<blockquote>
			<pre>
			tdjones22@bowie:~/grep_test$ grep "Python" test2.txt
			This is test file 2. Here are some Python facts:
			Pythons kill prey by squeezing them really tight.
			Pythons incubate their eggs by shivering.
			</pre>
			</blockquote>

			* <code> grep -n "<desired text>" <file></code> - Sometimes simply outputting the lines containing the match isn't enough, and you want to know ''where'' in the file it is. That's where the <code>-n</code> flag comes in. It outputs the line number along with the line. Here's <code>grep -n "Python" test2.txt</code>:
			<blockquote>
			<pre>
			tdjones22@bowie:~/grep_test$ grep -n "Python" test2.txt
			1:This is test file 2. Here are some Python facts:
			2:Pythons kill prey by squeezing them really tight.
			6:Pythons incubate their eggs by shivering.
			</pre>
			</blockquote>

	=== egrep ===		=== egrep ===

Tdjones22: Finish nano

2025-10-07T13:10:46Z

Finish nano

← Older revision		Revision as of 13:10, 7 October 2025
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	</blockquote>		</blockquote>

	=== nano ~~(NEEDS FINISHED)~~ ===		=== nano ===
	<code>nano</code> is a terminal-based text editor in its simplest form. The editing style is much more straightforward than other editors, like <code>Vim</code>, making it an easy choice for Linux beginners (and me, who's been using Linux for a few years, and still only uses Nano). Since it's just a text editor, I can't really 'show' you how to use it, but I can tell you about some really helpful shortcuts included in <code>nano</code>:		<code>nano</code> is a terminal-based text editor in its simplest form. The editing style is much more straightforward than other editors, like <code>Vim</code>, making it an easy choice for Linux beginners (and me, who's been using Linux for a few years, and still only uses Nano). Since it's just a text editor, I can't really 'show' you how to use it, but I can tell you about some really helpful shortcuts included in <code>nano</code>:
	* <code>nano file.txt</code> - This command takes you into the text editor with the chosen file. You can use <code>nano</code> on most text files, including: .txt, .c, .py, .log, .config, etc.		* <code>nano file.txt</code> - This command takes you into the text editor with the chosen file. You can use <code>nano</code> on most text files, including: .txt, .c, .py, .log, .config, etc.

Tdjones22: Added more hotkeys to nano command

2025-10-04T16:01:40Z

Added more hotkeys to nano command

← Older revision		Revision as of 16:01, 4 October 2025
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	* <code>Ctrl+O</code> - Saves the current file AND prompts you for the file name.		* <code>Ctrl+O</code> - Saves the current file AND prompts you for the file name.
	* <code>Ctrl+S</code> - Saves the current file without prompting for a file name; quick save, basically.		* <code>Ctrl+S</code> - Saves the current file without prompting for a file name; quick save, basically.
	* <code>Ctrl+X</code? - Exits the file; will prompt for saving if you haven't manually saved prior to exiting.		* <code>Ctrl+X</code> - Exits the file; will prompt for saving if you haven't manually saved prior to exiting.

	'''Navigation and Editing'''		'''Navigation and Editing'''
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	* <code>Ctrl+A</code> - Move the cursor to the beginning of the line (like the 'home' button on a Windows laptop).		* <code>Ctrl+A</code> - Move the cursor to the beginning of the line (like the 'home' button on a Windows laptop).
	* <code>Ctrl+E</code> - Move the cursor to the end of the line (like the 'end' button on a Windows laptop).		* <code>Ctrl+E</code> - Move the cursor to the end of the line (like the 'end' button on a Windows laptop).
			* <code>Alt+3</code> - Comments or uncomments line where cursor is located.
			* <code>Ctrl+W</code> - Initiates a text search that finds the nearest match that appears ''after'' your cursor's current position.
			<blockquote>
			* <code>Alt+W</code> - Find the next forward occurrence of the searched word.
			* <code>Alt+Q</code> - Find the next backward occurrence of the searched word.
			</blockquote>
			* <code>Alt+_</code> - Go to line and column number (e.g., '4, 3').
			* <code>Ctrl+K</code> - Cut the line your cursor is currently positioned on.
			<blockquote>
			* <code>Ctrl+U</code> - When cutting lines with <code>Ctrl+K</code>, they're temporarily stored in a cut buffer, which you can then repaste. Almost like copy and pasting, with the addition of removing the content you're copying. The cut buffer can store multiple lines.
			</blockquote>
			* <code>Alt+U</code> - Undoes the last action.
			* <code>Alt+E</code> - Redoes the last undone action.
			* <code>Ctrl+C</code> - Display the cursor's current position (line, column, character).
			* <code>Ctrl+G</code> - Opens the help system within <code>nano</code>.

	== Searching and Text Processing (TBD) ==		== Searching and Text Processing (TBD) ==

Tdjones22: Started nano command

2025-09-23T16:26:15Z

Started nano command

← Older revision		Revision as of 16:26, 23 September 2025
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	I highly recommend doing more intensive research on <code>fsck</code> before using it, as it can be destructive if used improperly.		I highly recommend doing more intensive research on <code>fsck</code> before using it, as it can be destructive if used improperly.

	== File Viewing and Editing ~~(TBD)~~ ==		== File Viewing and Editing ==

	=== cat ===		=== cat ===
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	</blockquote>		</blockquote>

	=== nano ===		=== nano (NEEDS FINISHED) ===
			<code>nano</code> is a terminal-based text editor in its simplest form. The editing style is much more straightforward than other editors, like <code>Vim</code>, making it an easy choice for Linux beginners (and me, who's been using Linux for a few years, and still only uses Nano). Since it's just a text editor, I can't really 'show' you how to use it, but I can tell you about some really helpful shortcuts included in <code>nano</code>:
			* <code>nano file.txt</code> - This command takes you into the text editor with the chosen file. You can use <code>nano</code> on most text files, including: .txt, .c, .py, .log, .config, etc.

			The following commands (shortcuts) will be executed within the <code>nano</code> editor.


			'''File Operations'''
			* <code>Ctrl+O</code> - Saves the current file AND prompts you for the file name.
			* <code>Ctrl+S</code> - Saves the current file without prompting for a file name; quick save, basically.
			* <code>Ctrl+X</code? - Exits the file; will prompt for saving if you haven't manually saved prior to exiting.

			'''Navigation and Editing'''
			* <code>Arrow Keys</code> - The arrow keys are used to move the cursor around the editor. You can't use your mouse/trackpad whilst in the editor.
			* <code>Ctrl+A</code> - Move the cursor to the beginning of the line (like the 'home' button on a Windows laptop).
			* <code>Ctrl+E</code> - Move the cursor to the end of the line (like the 'end' button on a Windows laptop).

	== Searching and Text Processing (TBD) ==		== Searching and Text Processing (TBD) ==

Tdjones22: Fixing typos in tail command section

2025-09-21T19:32:06Z

Fixing typos in tail command section

← Older revision		Revision as of 19:32, 21 September 2025
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	=== tail ===		=== tail ===
	The <code>tail</code> command allows you to see a preview of the end of a file's contents. Running <code>cat</code> can be cumbersome when a file contains a thousand lines (or more), so <code>tail</code> lets you get an understanding of its contents without flooding your terminal.		The <code>tail</code> command allows you to see a preview of the end of a file's contents. Running <code>cat</code> can be cumbersome when a file contains a thousand lines (or more), so <code>tail</code> lets you get an understanding of its contents without flooding your terminal.
	* <code>tail tail_test1.txt</code> - Running <code>~~head~~</code> on a file with no flags will default to displaying the last ten lines:		* <code>tail tail_test1.txt</code> - Running <code>tail</code> on a file with no flags will default to displaying the last ten lines:
	<blockquote>		<blockquote>
	<pre>		<pre>
Line 622:		Line 622:
	File1: Line100		File1: Line100
	</pre>		</pre>
	Based on the <code>wc -l tail_test1.txt</code>, the file contains 100 lines of text, though <code>~~head~~</code> only prints the last ten.		Based on the <code>wc -l tail_test1.txt</code>, the file contains 100 lines of text, though <code>tail</code> only prints the last ten.
	</blockquote>		</blockquote>

Line 721:		Line 721:
	</pre>		</pre>
	</blockquote>		</blockquote>


	=== nano ===		=== nano ===