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awk '{print > ("File"((/\|/)?"A":"B")".txt")}' File1.txt

Try:
sed 's|\(....\)\(..\)\(..\)\(..\)\(..\)\(..\)|\1/\2/\3;\4:\5:\6:|' infile

How about using awk

zcat /var/log/messages.2.gz | awk -v MAC=0012CFCDA11A -v C=0 '{ if ($0 ~ "DHCPDIS.*94.18.*"MAC ) C++ } END { print C, MAC }'

echo 'a|b|c|' | sed 's/[^|][^|]*/&|&/g'

awk ' { a[$1] = a[$1] == "" ? $2 : a[$1] " " $2 } END { for ( i in a ) { print i " " a[i] } } ' file | sort

Hi, welcome to the forum. This would be one way of doing that:
mv "$file" "$(head -1 "$file")"

csplit is for you. Read your documentation. /^2/ is the regular expression you need. See what you can come up with. We will help when you come back with questions.

sort -n -k1.9,1.12