Selecting only specific columns from a file in unix
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Well... that's a little misleading. They are still read, they're just not propagated downstream. Dropping them after input is not the same as not reading them at all, which is how I interpreted the OP's quest. Besides, you still have to fully specify them in the input data, something else the OP is trying to avoid.
-craig
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"You can never have too many knives" -- Logan Nine Fingers
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