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awk ' # range.prep
# Input: ["%begin"|"%end"|""] string (tab) number
# Output: string (tab) ["b"|"e"|"a"] (tab) number
BEGIN { FS = OFS = "\t" }
{ f2 = "a" }
$1 ~ /^%begin/ { f2 = "b"; sub(/^%begin */, "", $1) }
$1 ~ /^%end/ { f2 = "e"; sub(/^%end */, "", $1) }
{ print $1, f2, $2 }
' $*
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