Linux command to find user who failed to login from pop/imap

 journalctl -u dovecot -g "auth failed"

grep -i "auth failed" /var/log/mail.log | grep -E "imap|pop"

journalctl -u dovecot -g "auth failed" | grep -oE "user=<.*?>" | sort | uniq -c

grep "auth failed" /var/log/maillog | awk '{print $NF}' | sort | uniq -c | sort -nr

grep "auth failed" /var/log/maillog | grep "@example.com" | head

grep "auth failed" /var/log/maillog | \

grep -oE '[A-Za-z0-9._%+-]+@example\.com' | \

sort | uniq -c | sort -nr

grep "auth failed" /var/log/maillog | \

awk '/@example\.com/ {print $NF}' | \

sort | uniq -c | sort -nr

How to set up VSFTPD Server and FTP Account in AlmaLinux

sudo dnf install vsftpd

sudo mv /etc/vsftpd/vsftpd.conf /etc/vsftpd/vsftpd.conf_original

sudo vi /etc/vsftpd/vsftpd.conf

Add the following code to vsftpd.conf:

-------------------------------

anonymous_enable=NO

connect_from_port_20=YES

dirmessage_enable=YES

local_enable=YES

local_umask=022

listen=NO

listen_ipv6=YES

pam_service_name=vsftpd

userlist_enable=YES

write_enable=YES

xferlog_enable=YES

xferlog_std_format=YES

-------------------------------

cat /etc/vsftpd/vsftpd.conf 

sudo firewall-cmd --zone=public --add-service=ftp --permanent

sudo firewall-cmd --reload

sudo systemctl restart vsftpd

sudo useradd -m testftpuser

sudo passwd testftpuser

sudo bash -c "echo TO CHECK WORKING OF FTP > /home/baycombd/FTP_CHECK"

chown -R testftpuser /home/testftpuser

Note: Up to this user can access FTP files via ftp client application like FileZilla

How to install NGINX and configure on Ubuntu 20.04

sudo apt-get update

sudo apt upgrade

sudo apt install nginx

sudo systemctl status nginx

sudo ufw allow http

sudo ufw reload

sudo systemctl status nginx

sudo systemctl stop nginx

sudo systemctl start nginx

sudo systemctl disable nginx

sudo systemctl enable nginx

sudo systemctl restart nginx

sudo systemctl reload nginx

sudo unlink /etc/nginx/sites-enabled/default

sudo ln -s /etc/nginx/sites-available/example.com /etc/nginx/sites-enabled/

sudo nginx -t

sudo systemctl restart nginx

sudo mkdir /var/www/example.com

How to unzip tar.gz file in linux

sudo apt-get install zip

unzip file.zip -d destination_folder

unzip file.zip

tar -xf archive.tar.gz

How to restore a Large cPanel Backup file from Google Drive

 wget --load-cookies /tmp/cookies.txt "https://docs.google.com/uc?export=download&confirm=$(wget --quiet --save-cookies /tmp/cookies.txt --keep-session-cookies --no-check-certificate 'https://docs.google.com/uc?export=download&id=FILEID' -O- | sed -rn 's/.confirm=([0-9A-Za-z_]+)./\1\n/p')&id=FILEID" -O FILENAME && rm -rf /tmp/cookies.txt

Download Large File from Google Drive to Linux Directory using command

First install yum if not installed before : sudo yum install wget

Before the file to be downloaded it is needed to be share publicly.

Steps:

1. Select a file that is need to be downloaded and do right click.
2. Click Share. A dialog box will appear.
3. Click Advance in the right bottom corner.
4. Click on the Change.. under who has access.
5. Make it On- Public on the web.
6. Click Save button.
7. Copy the link for sharing…like…https://drive.google.com/file/d/1UibyVC_C2hoT_XEw15gPEwPW4yFyJFeOEA/view?usp=sharing
8. Extrac FILEID part like….from above….1UibyVC_C2hoT_XEw15gPEwPW4yFyJFeOEA

For small file run following command on your terminal:

wget --no-check-certificate 'https://docs.google.com/uc?export=download&id=FILEID' -O FILENAME

In the above command change the FILEID by above id extracted and rename FILENAME for your own simple use.

Large files

For large file run the following command with necessary changes in FILEID and FILENAME:

wget --load-cookies /tmp/cookies.txt "https://docs.google.com/uc?export=download&confirm=$(wget --quiet --save-cookies /tmp/cookies.txt --keep-session-cookies --no-check-certificate 'https://docs.google.com/uc?export=download&id=FILEID' -O- | sed -rn 's/.*confirm=([0-9A-Za-z_]+).*/\1\n/p')&id=FILEID" -O FILENAME && rm -rf /tmp/cookies.txt