Shell Programming and Scripting

A simple way might be to use bc -l and use printf to print the required precision:

Code:

$ c=32
$ f=$(echo "$c / 5 * 9 + 32" | bc -l)
$ printf "%.1f\n" "$f"
89.6
$ printf "%.0f\n" "$f"
90

If you run the following commands with a Korn shell newer than the November 16, 1988 version, the following will work:

Code:

echo $(($c / 5. * 9 +32))

or if you want it rounded (rather than truncated) to a whole number:

Code:

printf "%.0f\n" $(($c / 5. * 9 + 32))

Thanks a lot everyone. I got that part all sorted out now.
Everything is done, I wrote the whole shell script and it was working fine.


I have temperatures from another file to use as an input file.
ex.... of input file
0
5
10
32
64

I also have the conversion formula in a separate file (f2c.ss)

I needed to have my shell script take those and convert them from Celsius to Fahrenheit, and put them in an output file.

The problem is, I had everything done, and it worked. But I was using a while loop, and I just found out that I need to use as for/do loop.

This is what im working with right now,

This is a snippet of the for loop in my main script file:

Code:

for temp in `cat $input_file`
do
./c2f.ss "$temp"
echo $temp
done

And this is my c2f.ss file (which tested by itself, works perfect)

Code:

read c
f=$(echo $c / 5 \* 9 + 32 | bc -l);
echo $c "=" ${f%%.*} >> ans.file

The c2f script works great now, thanks to the help of all of you.
But something is wrong with my for loop, and I can't figure it out.

when I run my main script I keep getting the following error:

main: 39: ./c2f.ss: Permission denied
0
main: 39: ./c2f.ss: Permission denied
5
main: 39: ./c2f.ss: Permission denied
10
main: 39: ./c2f.ss: Permission denied
32
main: 39: ./c2f.ss: Permission denied
64

I had it all done with a while loop. But I was told that I have to use a for loop, and was given the code for the for loop. But there is obviously an error in the for loop code.

Anyone have any ideas?

Use a while loop instead in your main script:-

Code:

while read value
do
    ./c2f.ss $value
    echo $value
done < $input_file

Accept the argument passed in your c2f.ss script & do the math:-

Code:

c=$1
f=$(echo $c / 5 \* 9 + 32 | bc -l);
echo $c "=" ${f%%.*} >> ans.file

Also make sure your script c2f.ss is executable:-

Code:

chmod +x c2f.ss

Thanks,

I was using a while loop, But I was told I had to use a for loop.....

That is a Useless Use of Backticks hence I suggested to use while loop instead which is the right way to do.