From list to csv

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# 1  
Old 07-15-2011
From list to csv

i have a file with this row:

attribute1 item1
attribute2 item1
attribute3 item1
attribute1 item2
attribute2 item2
attribute3 item2
attribute1 itemn
attribute2 itemn
attribute3 itemn

I would change in a new file so:
item1,attribute1 item1,attribute2 item1,attribute3 item1
itemn,attribute1 itemn,attribute2 itemn,attribute3 itemn

i tried with s/\n/,/g to insert comma, but how can i group item in same row?
# 2  
Old 07-15-2011
Always 3 attributes?

---------- Post updated at 11:47 AM ---------- Previous update was at 11:40 AM ----------

[mute@sunny ~]$ awk '{ l[++c] = $0 } c==4 { for (i=1; i<4; i++) printf("%s,", l[i]); printf("%s\n", l[4]); c=0 }' attr
item1,attribute1 item1,attribute2 item1,attribute3 item1
item2,attribute1 item2,attribute2 item2,attribute3 item2
itemn,attribute1 itemn,attribute2 itemn,attribute3 itemn

# 3  
Old 07-15-2011
awk '{printf NR==1?$0:NR%4==1?"\n" $0:"," $0}END{print ""}' file

# 4  
Old 07-15-2011
OK! Array's are not needed. This is more readable Smilie

[mute@sunny ~]$ nawk 'NR%4 {printf $0",";next} 1' attr
item1,attribute1 item1,attribute2 item1,attribute3 item1
item2,attribute1 item2,attribute2 item2,attribute3 item2
itemn,attribute1 itemn,attribute2 itemn,attribute3 itemn

Edit: My first example works in old awk though. Also, it can be done with sed, you have to read in next line as well. I'm not a sed-user though this works

sed 'N;N;N;s/\n/,/g' file

Last edited by neutronscott; 07-15-2011 at 03:08 PM..
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# 5  
Old 07-16-2011
paste can do the job
# paste -d\, - - - - < file
item1,attribute1 item1,attribute2 item1,attribute3 item1
item2,attribute1 item2,attribute2 item2,attribute3 item2

Or use awk
awk '{printf ((NF==1)?((NR==1)?x:RS):",")$0}' file

Last edited by danmero; 07-16-2011 at 11:02 AM..
This User Gave Thanks to danmero For This Post:
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