* 2021-07-29 21:16:26+0100, mick crane wrote:
> 4 ((ct++))
> 5 scanimage > /home/mick/DATA/SCANS/scan-$ct.pnm
Items 4 and 5 could be combined using $((++ct)):
scanimage > /home/mick/DATA/SCANS/scan-$((++ct)).pnm
> What's the thing with the ct being in double brackets and not having
> the "$" ?
You have already got answers but here is another. Bash has a special
arithmetic evaluation mode which happens in:
let ... # returns true (0) or false (1)
(( ... )) # returns true (0) or false (1)
$(( ... )) # returns the value of the expression
--
/// Teemu Likonen - .-.. https://www.iki.fi/tlikonen/
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