How to remove directory in Linux

 To permanently remove a directory in Linux, use either rmdir or rm command:

• For empty directories, use rmdir [dirname] or rm -d [dirname]
• For non-empty directories, use rm -r [dirname]

Before you remove a directory, you need to know the name of it. To discover files and directories, use the ls command, and to know the current directory you are in, use the pwd command.

The options you use together with these commands are also important to determine how they work. Here’s a quick recap of rm command options:

Command and Option	Description
rm -d	Remove an empty directory using the rm command.
rm -r	Remove a non-empty directory and its content.
rm -f	Ignore any prompt when deleting a write-protected file.
rm -rf	Ignore any prompt when deleting a write-protected non-empty folder.
rm -i	Output a prompt before deleting every file.
rm -I	Output a prompt only once before deleting more than three files.
rm *	Wildcard that represents multiple characters.
rm ?	Wildcard that represents a single character.
rmdir -p	Remove an empty subdirectory and its parent directory.
rmdir -v	Print the information that the specified directory was deleted.

/usr/bin/env: 'php': No such file or directory CentOS Stream

sudo ln -s /usr/bin/php* /usr/bin/php

*= your current php version

Convert from CentOS Linux 8 to CentOS Stream 8

dnf --disablerepo '*' --enablerepo extras swap centos-linux-repos centos-stream-repos

dnf distro-sync

                                

                              

Reset MySQL Root Password on Red Hat Enterprise Linux 8

sudo systemctl stop mysqld

sudo systemctl set-environment MYSQLD_OPTS=”--skip-grant-tables”

sudo systemctl start mysqld

sudo mysql -u root

mysql> FLUSH PRIVILEGES;

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'NewRootPassw0rd!'; 

mysql> FLUSH PRIVILEGES;

mysql> QUIT;

sudo systemctl stop mysqld

sudo systemctl unset-environment MYSQLD_OPTS

sudo systemctl start mysqld

sudo mysql -u root -p

mysql> QUIT;

sudo mysql -u root -p

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'ChangeRootPassw0rd!';

mysql> ALTER USER 'shola'@'localhost' IDENTIFIED BY 'ChangeSholaPassw0rd!';

mysql> FLUSH PRIVILEGES;

mysql> QUIT;

Now login again with new root password !!

Make PPK to Pem using Mac terminal

sudo port install putty
or

brew install putty


This will also install puttygen. To get puttygen to output a .PEM file:
puttygen privatekey.ppk -O private-openssh -o privatekey.pem

Once you have the key, open a terminal window and:

ssh -i privatekey.pem user@my.server.com

The private key must have tight security settings otherwise SSH complains. Make sure only the user can read the key.

chmod go-rw privatekey.pem

How to run mysql from the command line on mac?

/Applications/AMPPS/mysql/bin/mysql -u root -pmysql

How to access EC2 instance if lost key Pair and root credentials

Step-1: 

Create a new instance with same OS as previous one or create it from AIM made from old instance

Step-2: 

Shutdown the old instance and detach the volume

Step-3: 

Shutdown new instance Attached the detached volume to new instance and start the instance

Step-4: 

Login new instance using ssh console

Run the following commands:

lsblk

df -h

cd mnt

mkdir oldvolume

sudo mount /dev/sda1 mnt/oldvolume

cd mnt/oldvolume/root/.ssh

sudo vi authorized_keys

Now add your public key and save 

umount /dev/sda1

sudo shutdown now

Step-5: 

Now detach the dev/sda1 volume from new instance and attach to old instance as dev/sda

Step-6:

Reboot old instance from AWS dashboard and login your old instance using ssh console 

 Note: Your old instance IP will be changed after doing this if no elastic IP