How to use multiple SSH key for same user by adding to ssh agent

Generate you ssh public key 

cd ~/.ssh && ssh-keygen

eval $(ssh-agent -s)

ssh-add ~/.ssh/id_rsa

Installing PHP 7.4 on macOS Sierra without brew?

 sudo port install php74

sudo port install php74-cgi php74-gd php74-curl php74-intl php74-iconv php74-gettext php74-mbstring php74-imap php74-mcrypt php74-xmlrpc php74-mysql php74-openssl php74-sockets php74-zip php74-tidy php74-opcache php74-xsl php74-sqlite

sudo port select php php74

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