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The linkuptime function doesn't take the input warning and critical arguments:

check_greater ${UPTIME} 1 0 "${RESULT}"

to fix it, you need to change that line to:

check_greater ${UPTIME} ${WARN} ${CRIT} "${RESULT}"

also, if you want the uptime in days/hours/minutes/seconds, you need to change the lines just above the fixed one to:

DAYS=$((${UPTIME}/3600/24))
HOURS=$(((${UPTIME}/3600)-(${DAYS}*24)))
MINUTES=$(((${UPTIME}-(${DAYS}*24*3600)-(${HOURS}*3600))/60))
SECONDS=$((${UPTIME}-(${DAYS}*24*3600)-(${HOURS}*3600)-(${MINUTES}*60)))
RESULT="Link uptime ${UPTIME} seconds (${DAYS}d ${HOURS}h ${MINUTES}m ${SECONDS}s)| uptime=${UPTIME} "