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what does this mean?

cat /etc/passwd | awk -F: '{print $5}' | \
awk -F, '{print $1}' | \
awk '{print tolower($l)};{print tolower($2)}' | \
grep -v '^$' >> local_tmp

thanks:)

What does this mean?

#!/bin/bash
BACKUPFILE=backup-$(date +%m-%d-%Y)
archive=${1:-$BACKUPFILE}