about PATH_MAX: the part of the POSIX standard which determines the maximum number of bytes allowed in an absolute path. In Linux, PATH_MAX is 4096 [src], but it’s possible to construct longer paths if you don’t care about some (most) utilities that use the current working directory to fail due to buffer overflow.
Also, I learned that most filesystems restrict file names to 255 bytes.
that different versions of sort(1) have different sorting presets.
For example, on ubuntu 20.04 vs debian buster, sort will swap the order of how it sorts _s.
These differences can be resolved by passing --unique --dictionary-order --stable.
Bonus: -h/--human-numeric-sort can sort SI suffixes.
that the fmt utility exists. It seems to fold or center text according to a target width.
That POSIX shell has configuration option, set -a or set -o allexport that exports all assigned variables.
This simplifies using .env files in .envrc files:
# evaluate a .env file, if it exists
if [ -f .env ]; then
set -a # assigning a variable exports the variable
# shellcheck disable=SC1091
source .env
set +a
fi
That JS has a String.raw template literal tag function that unescapes escape sequences in a backtick-string:
String.raw`\t\r\n` // => "\\t\\r\\n"