convert a fixed width file from text to csv

Question

I have a large data file in text format and I want to convert it to csv by specifying each column length.

number of columns = 5

column length

[4          


        

Answer 1

I would use sed and catch the groups with the given length:

$ sed -r 's/^(.{4})(.{2})(.{5})(.{1})(.{1})$/\1,\2,\3,\4,\5/' file
aasd,fh,90135,1,2
ajsh,dj, 2445,d,f