On 2006-05-25, Tien Pham <[EMAIL PROTECTED]> wrote:
> Dear all
> 
> I have a very large file containing 7000 lines of data in a single column. 
> Below is a sample. Many of them are 7 digit numbers and others are 8 digit 
> numbers. For those 7 digit numbers, I need to add number 0 at the beginning 
> of it. Can someone please show me a command to do it all in one hit? Those 
> 7 digits numbers have no regular patterns, except that they have 7 digits, 
> and the order of all numbers in the column has to remain unchanged.

    g/^\d\{7}$/s/^/0/

HTH,
Gary

-- 
Gary Johnson                 | Agilent Technologies
[EMAIL PROTECTED]     | Wireless Division
                             | Spokane, Washington, USA

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