To automatically keep current config files when doing apt-get install on Debian: apt-get install nginx -y -o Dpkg::Options::="–force-confdef" -o Dpkg::Options::="–force-confold"apt-get install nginx -y -o Dpkg::Options::="–force-confdef" -o Dpkg::Options::="–force-confold" You can find more info on Raphael Hertzog’s Blog. Here are more info about –force-confold and –force-confdef: confold: If a conffile has been modified and the version in […]

In Linux you can extract links from a web page easily: Using Lynx Extract links and save them to links.txt file: lynx -dump http://www.google.com | awk ‘/http/{print $2}’ > links.txtlynx -dump http://www.google.com | awk ‘/http/{print $2}’ > links.txt If you need to add numbers to lines, use nl command: lynx -dump http://www.google.com | awk ‘/http/{print […]

If you ran “apt-get upgrade” you don’t always need to reboot the Debian server. To know if you need to reboot the server after “apt-get upgrade”, check if this file is present (it is generally of 0 bytes, so it is an empty file): /var/run/reboot-required/var/run/reboot-required Here is an example on my Debian server: -rw-r–r– 1 […]

Install essential applications for building Debian packages: apt-get update apt-get install build-essentialapt-get update apt-get install build-essential The package build-essential will install libc6-dev, gcc, g++, make, etc. That’s all!

First install gcc and other needed packages to build ImageMagick: apt-get install build-essentialapt-get install build-essential Then install important ImageMagick libraries (i.e libpng, libjpeg, etc): apt-get install libpng-dev apt-get install libexif-dev apt-get install zlib1g-dev apt-get install libwebp-dev apt-get install libtiff5-dev apt-get install libjpeg-dev apt-get install libbz2-dev apt-get install liblzma-dev apt-get install libdjvulibre-dev apt-get install libopenjp2-7-dev apt-get […]

You can “harden” ImageMagick to prevent code execution and other vulnerabilities. Add this to /etc/ImageMagick-6/policy.xml: <!– Mitigate Image Magick vulnerabilities –> <!– https://imagetragick.com/#FAQ –> <policy domain="coder" rights="none" pattern="URL" /> <policy domain="coder" rights="none" pattern="HTTPS" /> <policy domain="coder" rights="none" pattern="EPHEMERAL" /> <policy domain="coder" rights="none" pattern="MVG" /> <policy domain="coder" rights="none" pattern="MSL" /> <policy domain="coder" rights="none" pattern="TEXT" /> <policy […]