Shell Programming and Scripting

HI All,

I have exactly 100 text files with extension .txt. The files contain numbers like this:

1.txt

Code:

0.4599994 65914
0.40706193 190743
0.39977244 185019
0.39831382 74906
0.3915928 122428
0.38844505 39999
0.38820446 72691
0.38787442 176430
0.38670844 28791
0.38597047 91091
0.38308746 37638

I want to extract all the second columns from all 100 files and store in 1 single file. But this has to be done sequentially starting from 1 to 100 not in any order.

But also after extracting after one file, I need 2 newlines in the resulting file so that I may know where the first file ends and the second one starts. Like this

output_file.dat

Code:

92839232
328932
589458495
212123
454


4343
23232
46565
43

The above output shows that after 1.txt has been extracted, I print two newlines before starting with 2.txt and keep going so on.

I know how to extract the second columns using this

Code:

awk '{print $2}' 1.txt

But I am not able to run it for 100 files. I am using Linux with BASH.

Code:

$ i=1; while [ $i -le 100 ];do cut -d' ' -f2 < ${i}.txt; i=$((i+1)); echo ""; echo ""; done > outfile

Code:

> new
for i in {1..100}.txt
do  
    awk '{print $2}END{printf RS RS}' $i >> new 
done