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play with nl
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| $ nl -v10 -i10 -s$'\n' -nln /dev/zero | head -n 10 | sed -e '5i\\\\:\\:\\:' -e ';7i\\\\:\\:' | nl -ba | |
| 1 10 | |
| 2 20 | |
| 3 30 | |
| 4 40 | |
| 50 | |
| 60 | |
| 1 70 | |
| 2 80 | |
| 3 90 | |
| 4 100 | |
| $ nl -s$'\n' -v0 -i10 /dev/zero | nl -bp' *100*$' -nln | awk 'NF==2' | |
| 1 10 | |
| 2 100 | |
| 3 1000 | |
| 4 10000 |
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