How to tell if a regular file doesn't exist in bash?

_{Extracted from sister question How do I tell if a regular file does not exist in bash? .}

Yes! You just have to use the negation !in the conditional:

if [ ! -f "archivo" ]; then
    echo "archivo no existe"
fi

Or in a more concise way:

[ ! -f "archivo" ] && echo "archivo regular no existe"

Note that it man testindicates that the option -f:

-f FILE
     FILE exists and is a regular file

So the negation of this simply means that what is indicated is not a regular file. It may be nothing or it may be a directory, etc.

You can use the negation !before the-f

if [ ! -f "$archivo" ]; then
    echo "archivo inexistente"
fi

or before[

if ! [ -f "$archivo" ]; then
    echo "archivo inexistente"
fi

It can also be used -ethis way

if [ ! -e "$archivo" ]; then
   echo "archivo inexistente"
fi

This is the script I use to check if a file exists:

if [ ! -f "/miFolder/miArchivo.txt" ]; then
    echo "El archivo no existe"
fi

the option -fis negated to determine the file does not exist.