Welcome to the website of Davis Fiore

Here's a list of the most common ones:

Add a user:

adduser john

Set the password for a user:

passwd john

Show the current directory:

pwd

Create the home directory for a user:

mkhomedir_helper john

Clear the screen:

clear

List a directory, including hidden files:

ls -a

List a directory, with detailed info:

ls -l

Create an empty file:

touch myfile.txt

Create a directory:

mkdir mydir

Copy a file

cp myfile.txt mydir

Move a file

mv myfile.txt mydir

Remove an empty directory:

rmdir mydir

Remove a directory:

rm -rf mydir

Remove a file:

rm myfile.txt

Rename a file or directory:

mv myfile.txt newfile.txt

show a file content:

cat myfile.txt

show a file with the less command:

less myfile.txt

Archive some files:

tar -cvf doc.tar *.doc

Compress a tar:

gzip doc.tar

Archive and compress files:

tar -zcvf doc.tar.bz2 *.doc
tar -jcvf doc.tar.gz *.doc

Extract archived files:

tar -xvf doc.tar

Decompress a file:

gzip -d doc.tar.gz

Decompress a tar file:

tar -xvf doc.tar

Create a symbolic link:

ln -s myfile.txt mysymboliclink

Create an hard link:

ln myfile.txt myhardlink

Delete a user:

userdel john

Delete a user and his home directory:

userdel -r john

Show information about a user:

chage -l john

Change one of the information about a user (like the minimum number of days between password change):

chage -m 3 john

Add a group:

groupadd hackers

Display user id and group for a user:

id john

Delete a group

groupdel hackers

Add a user to a group:

usermod -aG hackers john

Switch to a different user:

su john

Change the permission to a file:

chmod 755 myfile.txt

Change the owner of a file:

chown -R hackers:hackers myfile.txt

check what user you are logged with:

who i am