Thought I would share some automations I developed on macOS for quickly appending and prepending plain-text files. [Inspired by @capcrimepost.]
These use Automator, AppleScript and shell scripts. No third-party software required.
They are saved as Services so they can have keyboard shortcuts assigned to them and invoked on the fly, while working in any app.
I built these primarily to capture short text snippets for appending my daily recap journals.
I invoke the keyboard shortcut, a text prompt window appears ready for text entry, I type in my text, then hit Function+Return keys (to click the ‘OK’ button via keyboard).
My main journal log Service is set up to dynamically use the current date as part of the filename, creating a new file if necessary.
I also built a variant of the Prepend automation to display a list of filenames so I can prepend various plain-text files from one Service. I can write up a companion post on that one if there’s any interest.
The blog posts go into detail on everything, and have code that is copy-friendly for pasting into your own automation build.
I understand about not wanting to require a third-party tool for this, but (after a searching for a long time) I have finally found a Unix utility that will do this (although I can never remember what it is called).
The answer is sponge which can be installed via brew install moreutils (sort of like GNU’s coreutils but different )
It looks like others have helped you solve this, but as a non-programmer my solution would have been to use the text/code Atom editor, open the files as a Project in Atom, do a project-wide regex search/replace and prepend the text that way (the regex would just search for the start of the document).
I just did something similar to update a hashtag within all my plain-text note files.
I think BBEdit has similar capabilities to find/replace across multiple documents in a directory.