Rinomino, modifico o elimino il file.

Because Italian often drops the subject pronoun when it is already clear from the verb form.

Here, rinomino, modifico, and elimino all end in -o, which shows first person singular: I.

So:

• Rinomino, modifico o elimino il file. = natural
• Io rinomino, modifico o elimino il file. = also possible, but more emphatic

Italian does this much more often than English.

They are all in the present indicative, first person singular.

That means they literally correspond to I rename, I modify, and I delete/remove.

The ending -o is the key marker here:

• rinomin-o
• modific-o
• elimin-o

So the sentence is a normal present-tense statement.

It is a statement, not a command.

Because the verbs are first person singular, the sentence means I rename, modify or delete the file.

If it were a command to one person, Italian would use the imperative or the corresponding command form:

• Rinomina, modifica o elimina il file.

So rinomino = I rename, while rinomina = rename!

Because file is treated as a masculine singular noun in Italian, so it takes il.

• il file = the file
• i file = the files

It is not lo file, because file begins with a normal consonant sound, so the regular masculine article il is used.

Usually, no. File is a borrowed word and is normally invariable in Italian.

So you get:

• il file = the file
• i file = the files

The article changes, but the noun itself usually stays the same.

Because the same object belongs to all three verbs.

The sentence is understood as:

• I rename the file
• I modify the file
• or I delete the file

Italian, like English, does not need to repeat the object if it is the same for each verb.

So Rinomino, modifico o elimino il file is more natural than repeating il file three times.

The comma separates items in the list of actions.

Here the structure is:

• rinomino, modifico o elimino

Italian normally does not put a comma before o in a simple list like this. So the lack of a comma before o is standard.

The comma after rinomino just helps separate the first item from the rest.

The infinitives are:

• rinominare = to rename
• modificare = to modify
• eliminare = to eliminate/delete

All three are regular -are verbs.

The forms in the sentence are the io forms:

• rinominare → rinomino
• modificare → modifico
• eliminare → elimino

A useful extra note: modificare is regular, but like other -care verbs, it adds h in some forms to keep the hard c sound:

• tu modifichi
• noi modifichiamo

But in modifico, no h is needed.

Yes. In computer contexts, cancellare is also very common.

So you may see:

• Rinomino, modifico o elimino il file.
• Rinomino, modifico o cancello il file.

Both are possible, but there is a slight nuance:

• eliminare can sound a bit more general or formal, like remove/eliminate
• cancellare often feels very natural for delete, especially in digital contexts

So the sentence is correct as written, but cancello would also be a very common choice.