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BEGIN {
OFS = ":"
}
# Refuse to deal with anything that's not a positive (unsigned) integer
/[^0-9]/ {
print "hms: Bad number" | "cat >&2"
err = 1
next
}
# Integer looks valid
{
# Break it down into hours, minutes, and seconds
s = $0
h = int(s / 3600)
s %= 3600
m = int(s / 60)
s %= 60
# Print it, with the biggest number without a leading zero
if (h)
printf "%u:%02u:%02u\n", h, m, s
else if (m)
printf "%u:%02u\n", m, s
else
printf "%u\n", s
}
# Done, exit 1 if we had any errors on the way
END { exit(err > 0) }
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