How to reduce the size of a PDF file

Using ghostscript:

 gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/ebook -dNOPAUSE -dQUIET -dBATCH -sOutputFile=output.pdf input.pdf

To reduce it even more change -dPDFSETTINGS=/ebook to -dPDFSETTINGS=/screen.

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Recover GRUB bootloader

If GRUB gets wiped by other operating system or is installed in the wrong disk, do this:

-> Boot from a live Debian USB

-> Start a console/terminal.

-> Find the disk where you want to install GRUB (sdX):

# lsblk -f

-> Create a mountpoint (/ospart) where you are going to mount your system partitition (sdXY)

# mkdir /ospart
# mount /dev/sdXY /ospart

-> Change root to the system partition (/ospart)

# for i in /sys /proc /dev; do mount --bind $i /target$i; done
# chroot /ospart /bin/bash

-> (Re)Install GRUB on your desired disk (sdX)
# grub-install /dev/sdX
# update-grub

> Reboot!

Colored prompts in bash

To get colored prompts in bash shells, all we have to do is to change the PS1 line in each user’s .basrc file:
nano ~$USER/.bashrc

If necessary uncomment the line:
force_color_prompt=yes

I have a green prompt for the main user:
PS1='${debian_chroot:+($debian_chroot)}\[33[01;32m\]\u@\h\[33[00m\]:\[33[01;34m\]\w\[33[00m\]\$ '
which is the default if you enable color prompts.

a red one for root:
PS1='${debian_chroot:+($debian_chroot)}\[33[01;31m\]\u@\h\[33[00m\]:\[33[01;34m\]\w\[33[00m\]\$ '

and a purple one for my NAS:
PS1='\[33[01;35m\]\h\[33[00m\]:\w\$ '

 

Dyndns ddclient (Readynas addon) configuration file

replace emailaddress, username, password, servername1, servername2, servername3 accordingly.
/c/webroot/ddclient/ddclient.conf:

daemon=600
pid=/var/run/ddclient.pid
cache=/ramfs/ddclient.cache
#do not activate ssl
ssl=yes
syslog=yes
mail-failure=emailaddress # Mail failed updates to user
use=web, web=checkip.dyndns.com/, web-skip=’IP Address’
#uncomment the line bellow
#enlever le # sur les lignes suivantes :
login=username
password=password
protocol=dyndns2
server=servername1,servername2,servername3
#wildcard=YES

Use an SOCKS5 proxy through an SSH tunnel

From calomel.org

ssh and direct connect (SOCKS5) :

The following line will start the ssh client and connect to username@remote_machine.com.

Port 8080 on localhost (127.0.0.1) will listen for requests and send them to the remote machine.

The remote machine will then send the packets out as if they originated from itself.
ssh -C2qTnN -D 8080 username@remote_machine.com
Leave it running. And just configure the SOCKS5 proxy in the browser (localhost:8080)