/usr/share/doc/gawk/examples/lib/join.awk is in gawk 1:4.1.4+dfsg-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | # join.awk --- join an array into a string
#
# Arnold Robbins, arnold@skeeve.com, Public Domain
# May 1993
function join(array, start, end, sep, result, i)
{
if (sep == "")
sep = " "
else if (sep == SUBSEP) # magic value
sep = ""
result = array[start]
for (i = start + 1; i <= end; i++)
result = result sep array[i]
return result
}
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