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# Flatten input into one single-space separated line with no unprintable chars
# For each line of input ...
{
# Replace groups of spaces and control characters with one space,
# implicitly re-splitting the fields
gsub(/[\a\b\f\n\r\t\v ]+/, " ")
# Print each field, without a newline; add a leading space if it's not the
# very first one
for (i = 1; i <= NF; i++)
printf (f++) ? OFS "%s" : "%s", $i
}
# Print a newline to close the line
END { print "" }
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