Awk Turn on printing on a regular expression and turn it off on another
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awk '/^row2/ { print_on = 1 } /^row3/ { print_on = 0 } { if (print_on) { print $0 } }' ./sample.txt
awk '/^row2/ { print_on = 1 } /^row3/ { print_on = 0 } { if (print_on) { print $0 } }' ./sample.txt