I store my journal in a single folder like this:

📁 journal
    📝 2014-04-18.txt
    📝 2014-04-19.txt
    📝 2014-04-20.txt
    📝 2014-04-21.txt
    📝 ...

If you do too, journ is for you.

1. Put the journ executable somewhere in your $PATH.
2. Set the $JOURN_PATH environment variable (probably in your bashrc). This should be the path of a folder where all of your journal files will live.

# Edit today's file
journ

# Edit yesterday's file
journ -y

# Edit today's file in another editor
EDITOR=atom journ

# Print the path to today's file
journ -f

# Print $JOURN_PATH
journ -p

# Print the number of entries
journ -c

That's it!