Command line - nimrody/knowledgebase GitHub Wiki

• rb - using ruby on the command line

• Bash wiki

CSV manipulation commands

• q
• textql
• xsv

One liners

• List of connections using port 8080

  ss -pn '( dport = 8080 or sport = 8080 )'

• Get list of recently changed files:

  find $1 -type f -exec stat --format '%Y :%y %n' "{}" ; | grep -v cache |sort -nr | cut -d: -f2- | head

• Perl one liner search and extract

  perl -ne 'if (/(http.*?.m3u8)/) { print "$1\n"; }' *.html |uniq

• tcpdump - save to pcap file and display data on screen

  tcpdump -n -w - port 8080 |tee dump.pcap |tcpdump -A -r -

• More tcpdump

• tcpdump tutorial

• Common tcpdump options

• Bash redirection

VIM

• Tidy HTML (or XML) using tidy app: :!tidy -mi -html -wrap 0 % (will update the file inplace. use -xml for XML file).

• To reformat json in Vim:

  :%!python -m json.tool
  

• To highlight lines matching pattern

  :highlight feed ctermbg=darkred :match feed /search-term/

  Where feed is the group name

Installation

• Installing Rbenv

• To install the mysql gem using bundler one need to first sudo yum install mysql-devel