linux basic command syntax

Bezaleel Manor answered on July 19, 2022 Popularity 8/10 Helpfulness 1/10

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linux basic command syntax

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aptitude -v -v moo
aptitude -vv moo

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Contributed on Jul 19 2022

Bezaleel Manor

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linux basic command syntax

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ls -l -r
ls -rl
ls -lr

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Bezaleel Manor

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linux basic commands

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1.sudo // meaning superUser do give access to superuser work
	sudo -h // gives the command help 
2.pwd // meaning path of working directory
	pwd <options(-L or -P)> // -L gives path to logical path and -P for physical path
	//-L For example,if existing in a dir /home/symlinked, it's a symlink to /home/realdir; it would display /home/symlinked.
	//-P For example, if existing in a dir /home/symlinked, it's a symlink to /home/realdir; it would display /home/realdir.
3.cd <options(~[username] or .. or -)>
4.ls <options (-R or -a or -lh)>//-R recursive, -a means all including hidden files
	//-lh shows the file size with easy readable format
5.cat // meaning conacat used to conacat files
	cat filename.txt // view the file
	cat > filename.txt // creates a new file and ctrl+D to save the file
	cat file1.txt file2.txt > file3.txt // merges two files
	tac filename.txt // display content of file in reverse order
6.cp // to copy the files and directories
	cp filename.txt destinationPath
	cp filename.txt /home/username/Documents
	cp filename1.txt filename2.txt filename3.txt /home/username/Documents
	cp filename1.txt filename2.txt // copy content of file in another file
	cp -R /home/username/documents /home/username/documents_backup
		// -R copy everything recursively meaning copy whole directory
7.mv // primary use is to move and rename files and directories
	mv filename.txt /home/username/Documents // moves file to this directory
	mv old_filename.txt new_filename.txt // renames the filename

8.mkdir // used for creating one or many directries at once and set permission
	// for each one of them
	mkdir [options] directory_name
	mkdir Music // create a directory called Music
    mkdir Music/Songs // create a directory inside Music
	mkdir -p Anime/Movies // create multiple parent directories if needed
	mkdir -m a=rwx [directories] // read and write and execution access
	mkdir -v [directories] // verbose meaning print statement for each directory created

9.rmdir // removes empty directory but user must have sudo privilage in parent directory
	rmdir folder_name
    rmdir -p Anime/Movies //if both directores are empty we can delete both by using this flag
	
10.rm //this command is used to delete files in the directory
	// user performing this command must have write permission
	rm [options] filename.txt
	rm file1.txt file2.txt file3.txt // removes multiple files
	rm -i file1.txt file2.txt file3.txt // prompts for confirmation before deleting file
	rm -r directoryname/ // remvoes file recursively
    rm -f file1.txt file2.txt file3.txt // removes file without any confirmation

11.touch // this allows you to create empty file or to modify time stamp
	touch filename.txt // for creating file
	touch filename{1..3}.txt // create multiple file filename1.txt, filename2.txt, filename3.txt
    touch -a filename.txt // changes access time to currenttime
	touch -m filename.txt // chagnes modified time to currenttime
	touch -a -t YYYYMMDDhhmm.ss filename.txt// this will set the acess time as per provided
    touch  file1.txt -r file2.txt // this will copy access and modified time of file2.txt and update in file1.txt
	touch -d '8 Mar' filename.txt // this will set the give string as date and rest will be same as current time
	touch -d '20:10' filename.txt // this will se the time and rest will be same current date   

12. stat filname.txt // gives access, modified and created time data etc

13.locate // will help to find the file with the name
	locate filename.txt 
	locate -i school // will find all filenames having school word in it
    // -i ignores the case
    locate -i school*notes // finds all files with containing words school and notes

14.find // to find file or directory with directory path to look for
	find [directory] -name [filename]
	find /home -name notes.txt // will find notes.txt in home directory and its sub folder
	find -name notes.txt //will find notes.txt in current directory 
	find ./ type d -name directoryname // will find the directory with name

15.grep // to find some data in the file
	grep [options] pattern [FILE]
	grep -A2 pattern file_name // print 2 more lines after the pattern match
    grep -B2 pattern file_name // print 2 lines before the pattern match
	grep -C3 pattern file_name // print 3 lines before and after the patten match
    options:
	-i // case insensative search
	-w // search for words only
	-c // counts the total matches
	-r // search in recursive pattern
	-n // prints lines numbers
	-v //this options show the reverse match i.e which don't match
	grep pattern file1, file2, file3
	grep pattern * // search in the all present files
    grep 'query1\|query2' file // serarching for multiple queryies at a time
	egrep 'query1|query2' file 
	grep -e query1 -e query2 file
	grep -E 'query1|query2' file
	grep '^query' file // search the lines which starts with query
    grep '^query1.*query2$' file // finds lines which starts with query1 and endswith query2

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Contributed on Mar 06 2023

MarkSkAxel

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linux basic command syntax

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sysadmin@localhost:~$ aptitude moo
There are no Easter Eggs in this program.

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Contributed on Jul 19 2022

Bezaleel Manor

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linux basic command syntax

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sysadmin@localhost:~$ ls
Desktop  Documents  Downloads  Music  Pictures  Public  Templates  Videos

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Contributed on Jul 19 2022

Bezaleel Manor

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linux basic command syntax

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command [options…] [arguments…]

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Bezaleel Manor

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linux basic command syntax

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sysadmin@localhost:~$ ls Documents
School           alpha-second.txt  food.txt     linux.txt     os.csv
Work             alpha-third.txt   hello.sh     longfile.txt  people.csv
adjectives.txt   alpha.txt         hidden.txt   newhome.txt   profile.txt
alpha-first.txt  animals.txt       letters.txt  numbers.txt   red.txt

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Contributed on Jul 19 2022

Bezaleel Manor

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linux basic command syntax

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sysadmin@localhost:~$ aptitude moo  
There are no Easter Eggs in this program.

Popularity 8/10 Helpfulness 1/10 Language shell

Source: content.netdevgroup.com

Tags: basic command comm

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Contributed on Jul 19 2022

Bezaleel Manor

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linux basic command syntax

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sysadmin@localhost:~$ ls -l
total 32
drwx------ 2 sysadmin sysadmin 4096 Dec 20  2017 Desktop                        
drwx------ 4 sysadmin sysadmin 4096 Dec 20  2017 Documents                      
drwx------ 2 sysadmin sysadmin 4096 Dec 20  2017 Downloads                      
drwx------ 2 sysadmin sysadmin 4096 Dec 20  2017 Music                          
drwx------ 2 sysadmin sysadmin 4096 Dec 20  2017 Pictures                       
drwx------ 2 sysadmin sysadmin 4096 Dec 20  2017 Public                         
drwx------ 2 sysadmin sysadmin 4096 Dec 20  2017 Templates                      
drwx------ 2 sysadmin sysadmin 4096 Dec 20  2017 Videos

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Source: content.netdevgroup.com

Tags: basic command comm

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Contributed on Jul 19 2022

Bezaleel Manor

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linux basic command syntax

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sysadmin@localhost:~$ ls -r
Videos  Templates  Public  Pictures  Music  Downloads  Documents  Desktop

Popularity 8/10 Helpfulness 1/10 Language shell

Source: content.netdevgroup.com

Tags: basic command

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Contributed on Jul 19 2022

Bezaleel Manor

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linux basic command syntax

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sysadmin@localhost:~$ ls -l -r
total 32
drwx------ 2 sysadmin sysadmin 4096 Dec 20  2017 Videos                         
drwx------ 2 sysadmin sysadmin 4096 Dec 20  2017 Templates                      
drwx------ 2 sysadmin sysadmin 4096 Dec 20  2017 Public                         
drwx------ 2 sysadmin sysadmin 4096 Dec 20  2017 Pictures                       
drwx------ 2 sysadmin sysadmin 4096 Dec 20  2017 Music                          
drwx------ 2 sysadmin sysadmin 4096 Dec 20  2017 Downloads                      
drwx------ 4 sysadmin sysadmin 4096 Dec 20  2017 Documents                      
drwx------ 2 sysadmin sysadmin 4096 Dec 20  2017 Desktop   
sysadmin@localhost:~$ ls -rl
total 32
drwx------ 2 sysadmin sysadmin 4096 Dec 20  2017 Videos                         
drwx------ 2 sysadmin sysadmin 4096 Dec 20  2017 Templates                      
drwx------ 2 sysadmin sysadmin 4096 Dec 20  2017 Public                         
drwx------ 2 sysadmin sysadmin 4096 Dec 20  2017 Pictures                       
drwx------ 2 sysadmin sysadmin 4096 Dec 20  2017 Music                          
drwx------ 2 sysadmin sysadmin 4096 Dec 20  2017 Downloads                      
drwx------ 4 sysadmin sysadmin 4096 Dec 20  2017 Documents                      
drwx------ 2 sysadmin sysadmin 4096 Dec 20  2017 Desktop

Popularity 8/10 Helpfulness 1/10 Language shell

Source: content.netdevgroup.com

Tags: basic command comm

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Contributed on Jul 19 2022

Bezaleel Manor

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linux basic command syntax

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linux basic command syntax

linux basic command syntax

linux basic command syntax

linux basic command syntax

linux basic command syntax

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