In my continuing albeit sporadic pursuit of plain-text tools for completing tasks, I came across a tool called jrnl which is a command-line journaling program. It is written in Python and is cross platform.
I have installed it on both my home linux machine and work win 7 machine. It's pretty minimalist but allows one line journals to be entered from a command line, or they can be edited in a standard text editor. The website, jrnl.sh provides access to the program and documentation.
Simple, straightforward, easy to learn.
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