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#!/usr/bin/awk -f
BEGIN {
if ( from == "" || file == "" || to == "" ) {
print "Usage: replace-text -v from=PATTERN -v file=FILE -v to=PATTERN"
exit
}
}
$0 ~ from {
system("cat " file)
while ( getline ) {
if ( $0 ~ to )
break
}
}
{ print }
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