wikiti

require 'csv'

# To a file
CSV.open('path/to/file.csv', 'wb') do |csv|
  csv << ['row', 'of', 'CSV', 'data']
  csv << ['another', 'row']
  # ...
end

# To a String

wikiti

# Find out the PID of the process
ps -aux | grep <process-name>

# Check the environment variables
 cat /proc/<pid>/environ | tr '\0' '\n'
 
# For example:
 cat /proc/1234/environ | tr '\0' '\n'

wikiti

# Format
git log --oneline --graph

# To show all refs
git log --oneline --graph --all

wikiti

# TODO: This does not work

# To add a watcher
sudo auditctl -w </absolute/path/to/file>

# To remove a watcher
sudo auditctl -W </absolute/path/to/file>

# To list auditd rules
sudo auditctl -l

wikiti

# Format
sha1sum <files>

# Example:
sha1sum document.docx
# ab9d7658e42da2a00c56d3bc6cdf1d9d5f0d3c6e  document.docx

# Using multiple arguments:
sha1sum document.docx another_file.docx
# ab9d7658e42da2a00c56d3bc6cdf1d9d5f0d3c6e  document.docx

wikiti

# Format
while <command>; do :; done

# Example
while bundle exec rspec spec/models/project_spec.rb:15; do :; done

# Alternatively, you may use `until` instead of `while` to run a command until it returns a 0 exit code.
until <command>; do :; done

wikiti

# Find files by name
find path/to/folder -name <name or pattern>

# Find files and remove by name
find path/to/folder -name <name or pattern> -exec rm {} \;


# Examples
find ~/secrets -name super_secret.txt
find ~/images -name *.png

wikiti

# Use this commands after a git merge conflict, if you can't
# (or don't want to) fix the conflicts on some files.

# To use the base branch's file, use this:
git checkout --ours -- path/to/your/file.ext
git add path/to/file.ext

# To use the compare branch's file, use this:
git checkout --theirs -- path/to/your/file.ext
git add path/to/file.ext

wikiti

# Fetch a Rails timezone, and use it to parse a string
ActiveSupport::TimeZone[time_zone].parse(str)

# For example:
ActiveSupport::TimeZone['Madrid'].parse('2018-08-30 14:36')
# Thu, 30 Aug 2018 14:36:00 CEST +02:00

wikiti

# Use this command
fuser path/to/file.ext

# For example:
fuser log/development.log