Category Archives: Tools

in-memory key-value lightweight database

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For my little project i3-change.py I need lightweight in-memory database. My first idea was to use Redis (I have some experience with it) but it requires some library to control it. I need something more lightweight. I think using linux named pipes is elegant way how communicate with a database. Here is the full source of my lightweight in-memory database: https://github.com/petrposvic/in-memory-storage.

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imapfilter

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Tool to filtering e-mail. Can be installed via:

sudo apt install imapfilter

Example configuration in ~/.imapfilter/configu.lua:

local posvic_eu = IMAP {
  server = 'mail.posvic.eu',
  username = 'my@posvic.eu',
  password = '',
  ssl = 'ssl3',
}

local test = IMAP {
  server = 'test.email.com',
  username = 'my@email.com',
  password = '',
  ssl = 'ssl3',
}

function print_subjects(o)
  for _, msg in ipairs(filter) do
    mbox, uid = table.unpack(msg)
    text = mbox[uid]:fetch_message()
    print(string.match(text, 'Subject:[^\n]*'))
  end
end

posvic_eu.INBOX:check_status()
posvic_eu.INBOX
  :contain_from('beacon-monitor@post.cz')
  :contain_subject('Beacon Monitor Disk')
  :move_messages(posvic_eu['Trash'])

test.INBOX:check_status()
test.INBOX
  :contain_from('support@2n.cz')
  :contain_subject('Ticket#')
  :move_messages(test['INBOX/Automat'])
test.INBOX
  :contain_from('apps@crashlytics.com')
  :contain_subject('Meeting Room')
  :move_messages(test['INBOX/Automat'])

Bash cheatsheet

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files=(Screen*.png)
if [ $files = "Screen*.png" ]; then
  echo "No match"
else
  # Override or append
  files[2]="test1"

  # Remove
  files=("${files[@]:0:1}" "${files[@]:3:4}")

  # Length
  echo ${#files[@]}

  for file in "${files[@]}"; do
    echo "$i"
  done

  for ((i = 0; i < ${#files[@]}; i++)); do
    echo "${files[i]}"
  done
fi
case "$a" in
"a")
  echo "a"
  ;;
"b")
  echo "b"
  ;;
*)
  echo "else"
  ;;
esac
path="/var/www/html"
echo ${path##*/} # Last directory
# # from beginning, shortest match
# ## from beginning, longest match
# % from end, shortest match
# %% from end, longest match