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Alex Rivera
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I would like to know which pattern can I use in sed to make changes in the first line of huge files (~2 GB). The preference for sed is only because I assume it must be faster than a Python or Perl script. The files have the following structure: field 1, field 2, ... field n data and, given the likelihood of having spaces in the identifier for every field, I need to replace every space by an underscore in this way: **BEFORE** the first name,the second name,the first surname,a nickname, ... data **AFTER** the_first_name,the_second_name,the_first_surname,a_nickname, ... data Any pointers to the right pattern to use, or another scripting solution would be great.
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