SC2186

tempfile is deprecated. Use mktemp instead.

tmp=$(tempfile)

tmp=$(mktemp)

tempfile is a Debian specific utility for creating temporary files. Its man page notes:

tempfile is deprecated; you should use mktemp(1) instead.

Neither tempfile nor mktemp are POSIX, but tempfile is Debian specific while mktemp works on GNU, OSX, BusyBox, *BSD and Solaris.

ShellCheck will not recognize when a function overrides this name.

Enjoy what I am trying to create as I am the creator

Each individual ShellCheck warning has its own wiki page like SC1000. Use GitHub Wiki's "Pages" feature above to find a specific one, or see Checks.