Mailinglist Archive: opensuse (2430 mails)

[Anders Johansson <ajh@xxxxxxxxxx>]

On Saturday 19 April 2008 11:35:49 David C. Rankin wrote:
>       The problem was that I had to strip the "." from the temp reading to do
> the integer comparison in BASH and then I had to add it back to the output
> to get the decimal place back into the variable. (I know I don't need the
> decimal to know what the max temp was, but I wanted it there and I though I
> could learn something in the process)

One solution would be to do it in another language, like perl or python, that 
can do floating point

But in bash, something like this might work

tmax=0; while read a b c d; do tmpnum=${c/\./}; if [ $tmpnum -gt $tmax ]; then 
tmax=$tmpnum; fi; done < temps; tmax="${tmax:0:$((${#tmax}-1))}.
${tmax: -1:1}"; echo "Max temp is $tmax"

It assumes of course that there is only one decimal, and that it is always 
there.

>       With all the efficiency discussion on the list about reducing pipes, I
> though I would pose this cl and ask if there is a way to have sed parse the
> variables $t and $tmax without the echo and | I used above. I tried several
> things, but none worked (i.e. sed -e 's/\.//' < echo "$t"). Also, if there
> is a simpler way to do what I did, by all means let me know.

sed is almost never needed for things like this. bash can do it internally in 
almost all cases

Anders
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