Shell Programming and Scripting

Hi,
I was just helped with an excellent one liner. Now I need to know how to turn it into a script that I can call at the command line. So, this works with file script:

------------

Code:

for file in DATA.txt;
do
        awk 'NR==1;NR>1{for (i=1;i<=NF;i++){a[i]+=$i}}END{for (i=1;i<=NF;i++){printf a[i]/(NR-1)"\t"};printf "\n\
"}' $file > TEST;
done

----------

so, i execute this by doing

Code:

./script

it works. but how do I modify things so I can do this script on any file, e.g.:

Code:

./script DATA.txt

I know that this is an easy one, but I just don't know what that is even called to search for an answer!!!

Thanks

Mikey

Moderator's Comments:

Please use code tags when posting data and code samples, thank you.

Create the file (with an added check):

Code:

#! /usr/bin/awk -f

NR==1
NR>1{ for (i=1; i<=NF; i++) { a[i]+=$i; }
END { if (NR > 1) { for (i=1;i<=NF;i++) {printf a[i]/(NR-1) "\t";} } print ""; }

Make it executable:

Code:

chmod u+x scriptname

And run:

Code:

./scriptname inputfile... > outputfile

https://www.unix.com/shell-programmin...ll-script.html

Essentially, the first parameter becomes $1 and the second becomes $2 and so on....

THANK YOU AGAIN!

There was a missing curly bracket in there on the second line. I must be a real expert now


NR==1
NR>1{ for (i=1; i<=NF; i++) { a[i]+=$i; }}
END { if (NR > 1) { for (i=1;i<=NF;i++) {printf a[i]/(NR-1) "\t";} } print ""; }

And I this just a general way that you can do these things? I assume so!

Thanks again again,

Mike