将一列文本，按逗号分割生成一行三列

老狼01

a.txt
1
2
3
4
5
6
7
8
9
a
b
c

结果文件
b.txt
1 ,2 ,3
4 ,5, 6
7 ,8, 9
a ,b, c

zxy877298415

回复 1# 老狼01

1. awk '{printf NR%3==0?$0"\n":$0","}' file

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老狼01

回复 2# zxy877298415

谢谢。

mwl940602

awk 'ORS=NR%3?",":RS;END{printf RS}' a.txt

sunzhiguolu

1. perl -0pe "s{^((?:\N*\n?){3})(?=\n)}{join(q(,),split(/\n/,$1))}gme" f

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moperyblue

1. pr -atJ3s,

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zorro_998

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

manlong_2004

1. awk '{if(NR%3 == 0){printf("%s\n",$0)}else{printf("%s,",$0);}}'  a.txt

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