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Try

sed 's:\/:~:g'

Is this what you're trying to do?
awk '{print $6}' /var/log/messages | awk -F"|" '{t[$1]+=1}END{for (i in t){print t[i],i}}'

have you tried head and tail command?

head -1 file #prints the 1st line of file
tail -1 file #prints the last line of file