help with command syntax for bc (binary calculator)

[mitch]

I would like to pipe a file of numbers (one per line) to "bc" and have it run a function
like :
(( $input * 0.123 / 0.321 ) + 13 )

and spit all that back out to another file, can anyone help me with that syntax, I
want to do something like (I know this wont't work)

cat inputfilename | bc (( $input * 0.123 / 0.321 ) + 13 ) > outputfilename


thnx


regards,
Mitch

[Vfrc]

Don't know about bc, but try using awk?
cat inputfile | awk '{print ($1*0.123/0.321)+13) } ' > output

[Vfrc]

Ahem, the left bracket in my post needs to be doubled of course, to
read:
cat inputfile | awk '{print (($1*0.123/0.321)+13) } ' > output
Sorry about that.

[Larry Starr]

Post by mitch
I would like to pipe a file of numbers (one per line) to "bc" and have it run a function
(( $input * 0.123 / 0.321 ) + 13 )
and spit all that back out to another file, can anyone help me with that syntax, I
want to do something like (I know this wont't work)
cat inputfilename | bc (( $input * 0.123 / 0.321 ) + 13 ) > outputfilename
thnx
regards,
Mitch

(sed -e 's/^.*$/a += &/' ifile; echo '((a * 0.123 / 0.321 ) + 13 )') | \
bc > ofile
or
sed -e 's/^.*$/((& * 0.123 \/ 0.321 ) + 13 )/' inputfilename | \
bc > outputfilename

Depending on if you want to do the calculation on the sum of the lines
in the input file or on each line in the file.

Only guessing on the format of your input, of course.

Also you may want to specify precision:
(echo 'scale=3; sed -e 's/^.*$/((& * 0.123 / 0.321 ) + 13 )/' ifile) | \
bc > ofile


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