> 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).
> 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. > You should NOT be entering UTF-8 characters into bash commands, unless I know. I did not. > I really, very strongly, discourage you from pursuing this line of I’d rather like you to save your recommendations regarding how I am supposed to do things. > Am 01.05.2017 um 15:10 schrieb Greg Wooledge <wool...@eeg.ccf.org>: > > On Sun, Apr 30, 2017 at 08:31:30PM +0200, Florian Mayer wrote: >> I want to add up all numbers from 1 to 10, > > sum=0; for ((i=1; i<=10; i++)); do ((sum+=i)); done > >> but when I do >> $ echo $(({1,10}???+??? +0)) # with a space between the first + and the >> second one > > I cannot figure out what you actually typed here, because your UTF-8 > characters have been replaced by three question marks in my mail client. > > What I see is literally: echo $(({1,10}???+??? +0)) > > You should NOT be entering UTF-8 characters into bash commands, unless > they're literal characters that are part of a string that you want to > store or print or pass as an argument. They should certainly not be > part of an arithmetic expression. > >> I get an error: >> bash: ((: 1+ ,3 10+ ,3: syntax error: operand expected (error token is ",3 >> 10+ ,3???) > > So you are trying to be CLEVER? You are trying to trick bash into > executing code that generates code that will then be evaluated? And you > didn't even explictly call eval? > > I really, very strongly, discourage you from pursuing this line of > solutions. Generating code with the intent to eval it is NOT the way > to go for a simple arithmetic problem. Just use a loop.
