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Add "1234" to specific field in second column

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http://www.unix.com – i have this file Code: 073274753,0544901701,20101201,000316 038873722,69647455,20101130,235257 26213399,0545335767,20101201,000930 063330167,0566000101,20101201,000226 026773376,11966,20101130,234429,1194 075431120,0565900600,20101201,000428 75431120,0565900600,20101201,000538 038239110,0569224091,20101130,235616 035933611,0568580075,20101130,235939 025668601,0565651151,20101201,000046 i need if i have in first column any number doesn't start with zero i will add zero to it like this Code: 75431120,0565900600,20101201,000538 Code: 075431120,0565900600,20101201,000538 also (HowTos)