Move matched line above a different matched line using sed

Question

I have something like

dsadjakldjska safdsfdsfsf fdsfsf**STGN**fdsfsd fdsfkjldsf fdsff fdsfs**IRV**fdsfs

and I want to get

dsadjakldjska safdsfdsfsf fdsfkjldsf fdsff fdsfsf**STGN**fdsfsd fdsfs**IRV**fdsfs

but only for an interval of lines (say line 40000 till end of file) (moving the line containing STGN right above the next IRV underneath it)

Any idea how I can do this, or whether there's a better alternative for this than sed?

Stéphane Chazelas · Accepted Answer · 2014-08-12 15:14:44Z

3

awk 'NR < 40000 {print; next} /\*\*STGN\*\*/ {line = $0; next} /\*\*IRV\*\*/ && line {print line; line=""} {print}'

With sed:

sed -e '40000,$!b' -e '/\*\*STGN\*\*/{h;d;}' -e '/\*\*IRV\*\*/{x;/./p;s/.*//;x;}'

(they assume the STGN occurs before the IRV).

answered Aug 12, 2014 at 15:09

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