while script

[file system]

I want to get the calcuated value each line.

131648
131648
131648
107640
98880
98880
98880
82496
82496
82496
82496
82496
82240
82240
82112
74304
74304
74304
74304
74048
74048
74048

Above lines should be mutiplied by 4096 each.
I want to get calculated value.
which script is it fit for?

I want to thank you in advance.

[Sunil Sharma_1]

Hi,

You can try simple for loop for this. Store this list in a file say a.txt and then run following command

for i in $(cat a.txt)
do
bc $i*4096 >>/tmp/a.out
done


You will get output in /tmp/a.out

Sunil

[Ivan Krastev]

Try this one:


#!/usr/bin/ksh
for i in `cat test.txt`
do
ii=$(( $i / 4096 ));
print $ii;
done



regards,
ivan

[Peter Godron]

HI,
as you asked for a while statement:

#!/usr/bin/sh
while read a
do
echo `expr $a \* 4096`
done < a.lis

The script reads one line at a time from a.lis and multiplies the read amount by 4096.

The "\" before the multiplication sign is to make it clear to the shell that you want to use the "*" as a multiplication sign.

You can amend the echo statement to re-direct output and/or display the read value.

[Hein van den Heuvel]

Of course it may be more convenient to use awk or perl:

awk '{print 4096*$1}' old.txt > new.txt

perl -ple '$_ *= 4096' old.txt > new.txt


fwiw,
Hein.