Thanks to antville.org

install ubuntu GUI on EC2 instance

shantanuo — Mon, 17 Nov 2025 04:06:24 GMT

#!/bin/bashset -e

echo "===> Switching to text mode (stop GNOME crash)..."sudo systemctl set-default multi-user.target

echo "===> Removing GNOME..."sudo apt purge -y ubuntu-desktop gnome-shell ubuntu-session gdm3sudo apt autoremove -y

echo "===> Updating packages..."sudo apt update

echo "===> Installing FULL Xubuntu desktop (Firefox + LibreOffice + full GUI)..."sudo apt install -y xubuntu-desktop

echo "===> Installing XRDP..."sudo add-apt-repository -y universesudo apt updatesudo apt install -y xrdp

echo "===> Enabling XRDP..."sudo systemctl enable xrdpsudo systemctl restart xrdp

echo "===> Configuring XRDP to use Xfce..."echo "startxfce4" | sudo tee /etc/skel/.xsessionecho "startxfce4" > ~/.xsession

echo "===> If UFW exists, allow RDP..."sudo ufw allow 3389 || true

sudo useradd -m dbaecho "dba:india162" | sudo chpasswdsudo usermod -aG sudo dba

echo "===> Repair complete. Rebooting..."sudo reboot

Extract words

shantanuo — Sun, 13 Oct 2024 10:18:25 GMT

Extract all incorrect words in first.txt file and all correct ones in second.txt file using the following sed command.

sed -n 's/."(["])".*/\1/p' DocumentList.xml > first.txt

sed -n 's/["]"["]"["]"(["])".*/\1/p' DocumentList.xml > second.txt

Why do I care for Linux?

shantanuo — Thu, 17 Dec 2020 09:27:17 GMT

I don't care that much for other software. Linux is more than a kernel or an operating system. It is a symbol money does not rule everything. You don't pay for Linux. You don't have to watch ads when using it. In return, please be a little more friendly and tolerant to the people who build it. While Linux is built by professionals today, there is more heart and soul poured into it than in other operating systems.

beza1e1.tuxen.de

backup mysql users

shantanuo — Thu, 13 Feb 2020 13:49:56 GMT

3 steps to install percona utility...

yum install perl-DBI perl-Data-Dumper perl-DBD-MySQL

wget percona.com/get/pt-show-grants

perl pt-show-grants -h 1.2.3.4 -uroot -pPasswd

clear tmp folder

shantanuo — Sat, 08 Feb 2020 14:41:13 GMT

Here is following commands to clear unwanted stuff from the /tmp partition on the server?

tmpwatch –mtime –all 48 /tmp

The above command will remove all files and folders from the /tmp which have not been accessed in the last couple of days (24×2=48). You can modify the number of hours as required.

change your server time to IST

shantanuo — Sat, 08 Feb 2020 14:39:38 GMT

If you need to change your server clock to another timezone for e.g. (Indian Standard Time), you can do so by modifying the /etc/localtime file:

mv /etc/localtime /etc/localtime.bak

ln -s /usr/share/zoneinfo/Asia/Calcutta /etc/localtime

Transfer root emails to another email address

shantanuo — Sat, 08 Feb 2020 14:32:42 GMT

If you have root access to the server then open the file /etc/aliases in your favorite editor. Look for the section Person who should get root mail and make the change as required.

vim /etc/aliases

Person who should get root’s mail ##root: info@unixserveradmin.com

special strings in cron

shantanuo — Sat, 08 Feb 2020 14:30:01 GMT

Instead of the first five fields, you can use any one of eight special strings. It will not just save your time but it will improve readability.

Special string Meaning@reboot ——> Run once, at startup.@yearly ——> Run once a year, “0 0 1 1 *”.@annually –> (same as @yearly)@monthly —> Run once a month, “0 0 1 * *”.@weekly —–> Run once a week, “0 0 * * 0″.@daily ——–> Run once a day, “0 0 * * *”.@midnight –> (same as @daily)@hourly —–> Run once an hour, “0 * * * *”.

For e.g. run ntpdate every hour:@hourly /path/to/ntpdatevim /etc/ssh/sshd_config

while loop

shantanuo — Sun, 26 Jan 2020 12:24:23 GMT

This is a sample shell script while loop

while read mydbdoecho "time scp /home/backup/mysql/$mydb/ticket.txt.gz 1.2.3.4:/tmp/$mydb.txt.gz "done << dblistakolaIIakolakodblist

Selecting from error log

shantanuo — Sun, 26 Jan 2020 10:40:26 GMT

grep "error" error_log |awk -F[ {'print $4'}
| sort | sed -e 's/]//g' | grep -v "/var/www/html/"
| grep -v "/usr/local/src/code" | awk {'print $2'}
| grep -v "75.142.246.205" |uniq | awk -F. {'print $1"."$2"."$3"/24"'} |uniq

114.80.93/24119.63.193/24124.115.0/24205.234.253/24