On OS X, the easiest way to install jrnl is using Homebrew:
brew install jrnl
pipx install jrnl
The first time you run
jrnl you will be asked where your journal file
should be created and whether you wish to encrypt it.
To make a new entry, just type
jrnl yesterday: Called in sick. Used the time to clean the house and spent 4h on writing my book.
and hit return.
yesterday: will be interpreted as a time stamp.
Everything until the first sentence mark (
.?!:) will be interpreted as
the title, the rest as the body. In your journal file, the result will
look like this:
2012-03-29 09:00 Called in sick. Used the time to clean the house and spent 4h on writing my book.
If you just call
jrnl, you will be prompted to compose your entry -
but you can also configure jrnl to use your external editor.