Using sed to prepare my input file

erickFis · 10-31-2009, 06:23 PM

Hello!

I have this file:

Code:

[tcscan] audio frames=685.42, estimated clip length=27.42 seconds
[tcscan] (min/max) amplitude=(-0.404/0.398), suggested volume rescale=2.473
[tcscan] V: 685 frames, 27 sec @ 25.000 fps
[tcscan] A: 0.41 MB @ 128 kbps
USER CDSIZE:  650 MB | V:  649.6 MB @ 197089.8 kbps
USER CDSIZE:  700 MB | V:  699.6 MB @ 212260.2 kbps
USER CDSIZE: 1300 MB | V: 1299.6 MB @ 394304.6 kbps
USER CDSIZE: 1400 MB | V: 1399.6 MB @ 424645.4 kbps

and I want to use sed or alike to extract this little piece of info:

Code:

[tcscan] (min/max) amplitude=(-0.404/0.398), suggested volume rescale=2.473

That is, I need only the 2.473 part.

How can I extract it?

sycamorex · 10-31-2009, 06:48 PM

You could use awk to do it:

Quote:

awk -F= '/rescale/ { print $3 }' file

ghostdog74 · 10-31-2009, 06:49 PM

try produce your code next time.

Code:

$ awk -F"=" '/tcscan.*volume.*rescale/{print $NF}' file
2.473

sycamorex · 10-31-2009, 07:16 PM

In Sed, the following should work fine:

Code:

sed -n '/rescale/s/\(.*=\)\(.*\)/\2/p' file

erickFis · 11-04-2009, 04:33 AM

Quote:

Originally Posted by ghostdog74

try produce your code next time.

Code:

$ awk -F"=" '/tcscan.*volume.*rescale/{print $NF}' file
2.473

Thank you all!
It works!

I really enjoy writing my own code,
but sometimes I get stuck......

Just to add a little more info to this thread:

awk -F= '/rescale/ { print $3 }' lista

prints me the result I want,

and

num=`awk -F= '/rescale/ { print $3 }' lista`

adds the result to the $num variable,
therefore I can use it later in the script.

Thanks again!