UNIX for Dummies Questions & Answers

Hi gurus!

Please help me with this one. I have an file with the following contents:

Code:

a
b
c
d
e
f
g
h
i
j

I would like to make to transform it to look like this as my output file:

Code:

a,b,c
d,e,f
g,h,i
j

So for every 3 lines of the input file is read, that three lines of the column will converted into a comma delimited row. This should be done for every 3 lines until it reaches the end of the input file.


Any thoughts of using awk?

Thanks in advance!

Code:

$ awk '{printf("%s%s",$0,NR%3?",":"\n")}' input
a,b,c
d,e,f
g,h,i
j,

Code:

$ paste -d, - - - < infile
a,b,c
d,e,f
g,h,i
j,,

Code:

awk '{ORS=NR%3?",":"\n"}' filename

thanks guys! all of these worked for me.