El Fri 7 of Aug, Greg Wooledge profirió estas palabras: > > Those brackets I cited above: ( expression ) > In the US we call those "parentheses", and we reserve the word "brackets" > (or "square brackets") for [ ]. I realize that the UK uses different > terminology. Hence, the word is ambiguous and you should always type > the actual characters you mean.
Lesson learned. I didn't mean to enforce UK wording; I just forgot there was a more "natural" word for me (as Eduardo noted). [...] > [ is an ordinary command (a "shell builtin") Here is another point I find confusing: I thought a "shell builtin" didn't have a separate binary executable file, like 'cd' (which cd => fail), but some of them do have such form (which [ => /usr/bin/[ ; which pwd => /bin/pwd). I also fail to see how 'test' modifies the state of the shell itself (like 'cd' does), or why it is "impossible or inconvenient to obtain [its functionality] with separate utilities". But that's another story. > You were reading the section on [[ and assuming that it applies to [. > That's a huge mistake. [...] > Do not use -a or -o. They might as well not EXIST. Just forget them. > You can't use them in [ and you can't use them in test and you can't > use them in [[. > > Use one of the syntaxes I've shown here. Huge thanks. It was a good explanation. -- Juanma Menéndez
