You could avoid copying $1 if you use lookbehind, but there is that pesky problem of \s+ between the digit fields, which won't work with lookbehind (variable width rule). I couldn't tell by the OP's post whether there was a fixed number of spaces or not. Assuming only two spaces (or at least a known quantity of spaces) between the column fields, you could do something like this:

perl -pe "s/(?<=\d{8}\s\s\d{5})\s+/\n/g;" t.txt

[download]

Dave

In reply to Re^3: repeat data at one line and grep as pre-set format by davido
in thread repeat data at one line and grep as pre-set format by benlaw

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