Percentage of two files

[pepi37]

Under Linux, in same directory I have two files, One is file a. txt and second is b.txt
So I need script that will read number of lines in a.txt and divide it with number of lines in b.txt and *100 to get percentage.

[mathwiz]

How about something like:

$ echo 100*`wc -l a.txt | awk '{print $1}'`/`wc -l b.txt | awk '{print $1}'` | bc -l

[pepi37]

Originally Posted by mathwiz

How about something like:

$ echo 100*`wc -l a.txt | awk '{print $1}'`/`wc -l b.txt | awk '{print $1}'` | bc -l

It looks like not working

p: 1: $: not found

[Batalov]

echo `wc -l a` `wc -l b` |awk '{print $1*100/$3 "%"}'

[kruoli]

Originally Posted by pepi37

It looks like not working

You need to omit the very first dollar sign.

[retina]

Originally Posted by kruoli

You need to omit the very first dollar sign.

You can also omit the final   -l.

[pepi37]

Originally Posted by Batalov

echo `wc -l a` `wc -l b` |awk '{print $1*100/$3 "%"}'

As always , bingo! :)
Thanks
But I wrote the question a little clumsily :( ( my miastake)

File a has always same content (only number is changed) (example)

a.txt 193

so that is content of file a

I need some way to extract only number from file a in this case 193 and divide it with second value. I try with grep, but grep remove line, and since it is all in one line and that will not be changed ,grep is no use for me :(
Any suggestions?

[pepi37]

Originally Posted by mathwiz

How about something like:

$ echo 100*`wc -l a.txt | awk '{print $1}'`/`wc -l b.txt | awk '{print $1}'` | bc -l

echo 100* `wc -l a.txt | awk '{print $1}'`/`wc -l b.txt | awk '{print $1}'` | bc

without -l result is rounded

[mathwiz]

Originally Posted by pepi37

echo 100* `wc -l a.txt | awk '{print $1}'`/`wc -l b.txt | awk '{print $1}'` | bc

without -l result is rounded

You should learn tools like wc, grep, awk etc and understand what they are doing and how to chain them together.

[pepi37]

Originally Posted by mathwiz

You should learn tools like wc, grep, awk etc and understand what they are doing and how to chain them together.

Dont think that I just have some idea and post my question here without any try before. Linux is new OS to me,so I learn when I have time. Maybe my question are silly to you, but we all start at some point.

[retina]

man echo
man awk
man bc
man grep
man wc
...

My favourite is man date