On Mon, May 01, 2017 at 03:29:43PM +0200, Florian Mayer wrote: > > sum=0; for ((i=1; i<=10; i++)); do ((sum+=i)); done > You can actually omit ???sum=0;???, because bash dereferences unset variables > to 0 > (according to the holy manual of course).
Not if the user running the script exported sum=bwahahaha into the environment. That's why you should always initialize shell variables before reading them (unless the ability to pass one in through the environment is an intended feature of your script, in which case you want to sanity check it). > > I cannot figure out what you actually typed here, because your UTF-8 > > I don???t know what caused that, but it was not intentionally. > https://lists.gnu.org/archive/html/bug-bash/2017-04/msg00152.html > correctly shows what I???ve submitted. Going there in a GUI browser on a Debian (UTF-8) system and then copy/pasting one of your quote-marks into a printf|hd command confirms that you are using UTF-8 curly quotes. wooledg:~$ printf %s "?" | hd 00000000 e2 80 99 |...| 00000003 However, my mail client is on an HP-UX (Latin-1) system, so I cannot paste the actual symbol here. I'll use a single question mark instead. If your commands "work" in your shell, but then magically transform into unusable curly quote glyphs in your mail client, then it's probably your mail client performing the transformation. Or your text editor, or your web browser if you're using web-mail. Your apostrophes in the words "don't" and "I've" up above are also mangled, as are whatever you put around "sum=0;" in your first sentence. Just so you know.
