Thanks for the prompt reply Zaxxon!

I have amended my run line to look like

Code:

for id in `cat list` ; do sed -i -e 's/'${id}',//g' customers.cfg ; done

However the same happens; the line runs with no problem however nothing is edited within the file.

Also when I try

Code:

grep -fwv

I get

Code:

grep: wv: No such file or directory

Could the problem be the numbers within my list file?

At the moment when I

Code:

cat list

I get a long line of numbers similar to;

Code:

1
2
3
4
5
etc
etc

Would that affect the outcome of the run line?