Finally migrated my 2014-era web application off an old server.
When I set it up, I tried to take good notes. These days I expect a bundle I can deploy with command -- a list of required packages is distro-specific, labour intensive, and bitrots!
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The most common selling point I hear for Nix is having a list of all the packages you need.
On a traditional Linux distro, I just install things and forget about them. A curated, commented list would certainly be handy when I have a new system.
There are *so many* ways that reading a text file can fail.
Maybe it doesn't exist, it's a broken symlink, it's actually a directory, it's not the encoding you expected, or perhaps you just don't have the correct permissions.
Reporting good errors is surprisingly labour intensive.
In praise of Tcl, and reflecting on syntax features for a good command shell: https://yosefk.com/blog/i-cant-believe-im-praising-tcl.html