linux shell列转行加分隔符

➜  ~ cat a
123
456
222
3312
➜  ~
➜  ~ awk '{printf "%s,",$1}' a
123,456,222,3312,%

➜  sg seq 16396 16405|awk '{printf"%s,",$1}'
16396,16397,16398,16399,16400,16401,16402,16403,16404,16405,%