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lang-bash
set -- "$(date +'%H')" ${1+"$@"}; <do whatever with $1>; shift;We never need worry about whether__hourpre-exists in the environment where we are to source stuff.localbuiltin to keep variables within the scope of the function and its children without polluting the global environment.-f,rmmay prompt the user which we likely don't want here.rm -f -- "$file"would be more correct and would have also have the benefit of not returning an error if the file was already gone.bash,unsetmay unset a function, if a variable by that name is not found. In that shell, it's a good habit to useunset -v varto make sure you unset a variable.