Append to same line in Bash

Question

The file letters.csv contains:

b,a,c,

The file numbers.csv contains:

32
34
25
13

I would like to append numbe

Answer 1

awk to the rescue!

$ awk 'NR==FNR{printf "%s",$0; next} 
              {print $0} 
           END{ORS="\n"; print ""}' letters ORS=, numbers | 
  sed '$s/,$//'    # to delete last ","

b,a,c,32,34,25,13