Linux
GNU Regex POSIX character classes
How to remove/delete CTRL-M (^M) characters from text files in Linux and UNIX systems
AWK as Grep
Colorize linux programs output
Learn how to make your Bash/Shell script colourful and attractive without installing any plugins and configuration.
7-bit ASCII Character Codes
nftables geoip - continents ip
nftables and GeoIP
How nftables log to external file
BIND DNS server - permission denied
How to Configure Proxy in Debian/CentOS/RHEL/Fedora
