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Code Samples

Basics

# Where is the file belonging to this command
whereis $CMD
# Short description of the command
whatis $CMD
# Search command by description
apropos $DESC

TCP Connections sorted by state

  netstat -nat | awk '{print $6}' | sort | uniq -c | sort -n

Swap usage per process

  for file in /proc/*/status ; do awk '/VmSwap|Name/{printf $2 " " $3}END{ print ""}' $file; done | sort -k 2 -n -r | less

Delete lots of files

  perl -e 'for(<*>){((stat)[9]<(unlink))}'

Get rid of failed apt-get install process

  dpkg --get-selections > install_list
  # -> adjust the package from install to deinstall or remove it completely out of the list
  dpkg --clear-selections
  dpkg --set-selections < install_list
  apt-get -u dselect-upgrade

Full unattended upgrade via apt

  apt update && apt -o Dpkg::Options::="--force-confdef" -o Dpkg::Options::="--force-confold" full-upgrade

NFT show ruleset

  nft list ruleset

Get information about a ssl certificate

  # Hash value of the certificate
  openssl x509 -in $CERT -noout -hash
  # Fingerprint of certificate
  openssl x509 -in $CERT  -noout  -fingerprint
  # All information about the certificate
  openssl x509 -in $CERT -issuer -noout -subject -dates -text