ref: a351bcdccdf5a4273bc8dc3360a48fbb8b8aa9ea
dir: /idx/range.prep/
#!/bin/rc
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 }
' $*